SHUTDOWN
COUT
2.2 µF
LP2951
SHUTDOWN
GND
OUT
ERROR
IN
VOUT VIN
CIN
1 µF
SENSE
VTAP
FEEDBACK
VFEEDBACK
R1
330 kVOUT
VIN
CIN
1 µF
OUT
GND
IN COUT
2.2 µF
LP2950
VOUT
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LP2950-N
,
LP2951-N
SNVS764Q JANUARY 2000REVISED DECEMBER 2017
LP295x-N Series of Adjustable Micropower Voltage Regulators
1
1 Features
1 Input Voltage Range: 2.3 V to 30 V
5-V, 3-V, and 3.3-V Output Voltage Versions
Available
High Accuracy Output Voltage
Ensured 100-mA Output Current
Extremely Low Quiescent Current
Low Dropout Voltage
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Use as Regulator or Reference
Needs Minimum Capacitance for Stability
Current and Thermal Limiting
Stable With Low-ESR Output Capacitors (10 m
to 6 )
LP2951-N Versions Only:
Error Flag Warns of Output Dropout
Logic-Controlled Electronic Shutdown
Output Programmable From 1.24 V to 29 V
2 Applications
High-Efficiency Linear Regulator
Regulator with Undervoltage Shutdown
Low Dropout Battery-powered Regulator
Snap-ON/Snap-OFF Regulator
space
space
space
space
space
space
space
space
space
LP2951 Simplified Schematic
3 Description
The LP2950-N and LP2951-N are micropower
voltage regulators with very low quiescent current
(75 µA typical) and very low dropout voltage (typical
40 mV at light loads and 380 mV at 100 mA). They
are ideally suited for use in battery-powered systems.
Furthermore, the quiescent current of the device
increases only slightly in dropout, prolonging battery
life.
Careful design of the LP2950-N/LP2951-N has
minimized all contributions to the error budget. This
includes a tight initial tolerance (0.5% typical),
extremely good load and line regulation (0.05%
typical) and a very low output voltage temperature
coefficient, making the part useful as a low-power
voltage reference.
One such feature is an error flag output which warns
of a low output voltage, often due to falling batteries
on the input. It may be used for a power-on reset. A
second feature is the logic-compatible shutdown input
which enables the regulator to be switched on and
off. Also, the part may be pin-strapped for a 5-V, 3-V,
or 3.3-V output (depending on the version), or
programmed from 1.24 V to 29 V with an external
pair of resistors.
The LP2950-N is available in the surface-mount TO-
252 package and in the popular 3-pin TO-92 package
for pin-compatibility with older 5-V regulators. The 8-
pin LP2951-N is available in plastic, ceramic dual-in-
line, WSON, or metal can packages and offers
additional system functions.
Device Information(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
LP2950-N TO-92 (3) 4.30 mm × 4.30 mm
TO-252 (3) 9.91 mm × 6.58 mm
LP2951-N
SOIC (8) 4.90 mm × 3.91 mm
VSSOP (8) 3.00 mm × 3.00 mm
WSON (8) 4.00 mm × 4.00 mm
PDIP (8) 9.81 mm × 6.35 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
LP2950-N Simplified Schematic
2
LP2950-N
,
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Table of Contents
1 Features.................................................................. 1
2 Applications ........................................................... 1
3 Description............................................................. 1
4 Revision History..................................................... 2
5 Voltage Options ..................................................... 3
6 Pin Configuration and Functions......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information: LP2950-N................................ 6
7.5 Thermal Information: LP2951-N................................ 6
7.6 Electrical Characteristics........................................... 7
7.7 Typical Characteristics............................................ 10
8 Detailed Description............................................ 16
8.1 Overview................................................................. 16
8.2 Functional Block Diagrams ..................................... 16
8.3 Feature Description................................................. 17
8.4 Device Functional Modes........................................ 18
9 Application and Implementation ........................ 19
9.1 Application Information............................................ 19
9.2 Typical Applications ................................................ 20
10 Power Supply Recommendations ..................... 32
11 Layout................................................................... 32
11.1 Layout Guidelines ................................................. 32
11.2 Layout Example .................................................... 32
11.3 WSON Mounting................................................... 33
12 Device and Documentation Support................. 34
12.1 Documentation Support ....................................... 34
12.2 Related Links ........................................................ 34
12.3 Community Resources.......................................... 34
12.4 Trademarks........................................................... 34
12.5 Electrostatic Discharge Caution............................ 34
12.6 Glossary................................................................ 34
13 Mechanical, Packaging, and Orderable
Information........................................................... 34
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision P (May 2016) to Revision Q Page
Changed LP2951-N ESD parameter pin references and added SENSE pin row to LP2951-N ESD parameter in ESD
Ratings table........................................................................................................................................................................... 5
Changes from Revision O (December 2014) to Revision P Page
Added rows to ESD Ratings table to differentiate values for pins 3 and 7 of the LP2951-N device...................................... 5
Added footnotes 2 and 3 to both Thermal Information tables ............................................................................................... 6
Changes from Revision N (May 2013) to Revision O Page
Added Device Information and ESD Rating tables, Feature Description,Device Functional Modes,Application and
Implementation,Power Supply Recommendations,Layout,Device and Documentation Support, and Mechanical,
Packaging, and Orderable Information sections; moved some curves to Application Curves section; update pin
names; change package nomenclature from National to TI .................................................................................................. 1
Changes from Revision M (April 2013) to Revision N Page
Changed layout of National Data Sheet to TI format ............................................................................................................ 1
3
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5 Voltage Options
DEVICE NUMBER PACKAGE VOLTAGE OPTION (V)
LP2950-N
TO-92 (LP) 3 (±0.5%, ±1 %)
3.3 (±0.5%, ±1 %)
5 (±0.5%, ±1 %)
TO-252 (NDP) 3 (±1 %)
3.3 (±1%)
5 (±1%)
LP2951-N
SOIC (D) 3 (±0.5%, ±1%)
3.3 (±0.5%, ±1%)
5 (±0.5%, ±1%)
VSSOP (DGK) 3 (±0.5%, ±1%)
3.3 (±0.5%, ±1%)
5 (±0.5%, ±1%)
WSON (NGT) 3 (±0.5%, ±1%)
3.3 (±0.5%, ±1%)
5 (±0.5%, ±1%)
PDIP (P) 5 (±0.5%, ±1%)
OUT
SENSE
SHUTDOWN
GND
VTAP
IN
FEEDBACK
ERROR
DAP
1
2
3
4 5
6
7
8
4
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6 Pin Configuration and Functions
LP Package
3-Pin TO-92
Bottom View
P, D, DGK Packages
8-Pin PDIP, SOIC, VSSOP
Top View
NDP Package
3-Pin TO-252
Front View
NGT Package
8-Pin WSON
Top View
Connect DAP to GND at device pin 4.
Pin Functions: LP2950-N
PIN
I/O DESCRIPTION
NAME LP2950
LP NDP
GND 2 2 Ground
IN 3 1 I Input supply voltage
OUT 1 3 O Regulated output voltage
Pin Functions: LP2951-N
PIN
I/O DESCRIPTION
NAME LP2951
D, DGK, P NGT
ERROR 5 5 O Error output
FEEDBACK 7 7 I Voltage feedback input
GROUND 4 4 Ground
IN 8 8 I Input supply voltage
OUT 1 1 O Regulated output voltage
SENSE 2 2 I Output voltage sense
SHUTDOWN 3 3 I Disable device
VTAP 6 6 O Internal resistor divider
5
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(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If Military/Aerospace specified devices are required, contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) May exceed input supply voltage.
(4) When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be
diode-clamped to ground.
7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)(2)
MIN MAX UNIT
Input supply voltage - SHUTDOWN input voltage error comparator output voltage(3) –0.3 30 V
FEEDBACK input voltage(3)(4) –1.5 30 V
Power dissipation Internally Limited
Junction temperature, TJ150
°C
Soldering dwell time, temperature Wave 4 seconds, 260
Infrared 10 seconds, 240
Vapor phase 75 seconds, 219
Storage temperature, Tstg –65 150 °C
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
7.2 ESD Ratings VALUE UNIT
LP2950-N
V(ESD) Electrostatic
discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2500 V
LP2951-N
V(ESD) Electrostatic
discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-
001(1)
IN, OUT, GND, ERROR ±2500
V
SHUTDOWN ±2000
SENSE ±1500
VTAP, FEEDBACK ±1000
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) The junction-to-ambient thermal resistances are as follows: 157.4°C/W for the TO-92 (LP) package, 51.3°C/W for the TO-252 (NDP)
package, 56.3°C/W for the molded PDIP (P), 117.7°C/W for the molded plastic SOIC (D), 171°C/W for the molded plastic VSSOP
(DGK). The above thermal resistances for the P, D, and DGK packages apply when the package is soldered directly to the PCB. The
value of RθJA for the WSON (NGT) package is typically 43.3°C/W but is dependent on the PCB trace area, trace material, and the
number of layers and thermal vias. For details of thermal resistance and power dissipation for the WSON package, see AN-1187
Leadless Leadframe Package (LLP).
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
Maximum input supply voltage 30 V
Junction temperature, TJ(2) LP2950AC-XX, LP2950C-XX –40 125 °C
LP2951 –55 150 °C
LP2951AC-XX, LP2951C-XX –40 125 °C
6
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(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
(2) Thermal resistance value RθJA is based on the EIA/JEDEC High-K printed circuit board defined by JESD51-7 - High Effective Thermal
Conductivity Test Board for Leaded Surface Mount Packages.
(3) The PCB for the TO-252 (NDP) package RθJA includes twelve (12) thermal vias under the tab per EIA/JEDEC JESD51-5.
7.4 Thermal Information: LP2950-N
THERMAL METRIC(1) LP2950-N
UNITLP (TO-92) NDP (TO-252)
3 PINS 3 PINS
RθJA(2) Junction-to-ambient thermal resistance, High-K 157.4 51.3(3) °C/W
RθJC(top) Junction-to-case (top) thermal resistance 81.2 53.5 °C/W
RθJB Junction-to-board thermal resistance 153.6 30.4 °C/W
ψJT Junction-to-top characterization parameter 25.2 5.5 °C/W
ψJB Junction-to-board characterization parameter n/a 30 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance n/a 2.2 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
(2) Thermal resistance value RθJA is based on the EIA/JEDEC High-K printed circuit board defined by JESD51-7 - High Effective Thermal
Conductivity Test Board for Leaded Surface Mount Packages.
(3) The PCB for the WSON (NGT) package RθJA includes six (6) thermal vias under the exposed thermal pad per EIA/JEDEC JESD51-5.
7.5 Thermal Information: LP2951-N
THERMAL METRIC(1)
LP2951-N
UNIT
P (PDIP) D (SOIC) DGK
(VSSOP) NGT
(WSON)
8 PINS 8 PINS 8 PINS 8 PINS
RθJA(2) Junction-to-ambient thermal resistance, High K 56.3 117.7 171.0 43.3(3) °C/W
RθJC(top) Junction-to-case (top) thermal resistance 45.7 63.7 62.3 35.0 °C/W
RθJB Junction-to-board thermal resistance 33.5 57.9 91.4 23.3 °C/W
ψJT Junction-to-top characterization parameter 22.9 15.9 8.9 0.5 °C/W
ψJB Junction-to-board characterization parameter 33.3 57.5 90.1 20.5 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance n/a n/a n/a 9.1 °C/W
7
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(1) Unless otherwise noted, all limits apply for TA= TJ= 25°C as well as specified for VIN = (VONOM + 1 V), IL= 100 µA and CL= 1 µF for
5-V versions and 2.2 µF for 3-V and 3.3-V versions. Additional conditions for the 8-pin versions are FEEDBACK tied to VTAP, OUTPUT
tied to SENSE, and VSHUTDOWN 0.8 V.
(2) A Military RETS specification is available on request.
(3) All LP2950 devices have the nominal output voltage coded as the last two digits of the part number. In the LP2951 products, the 3-V
and 3.3-V versions are designated by the last two digits, but the 5-V version is denoted with no code at this location of the part number
(refer to the Package Option Addendum at end of data sheet).
(4) Ensured and 100% production tested.
(5) Ensured but not 100% production tested. These limits are not used to calculate outgoing AQL levels.
(6) Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
(7) Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to
heating effects are covered under the specification for thermal regulation.
(8) Line regulation for the LP2951-N is tested at 150°C for IL= 1 mA. For IL= 100 µA and TJ= 125°C, line regulation is specified by design
to 0.2%. See Typical Characteristics for line regulation versus temperature and load current.
7.6 Electrical Characteristics
over operating free-air temperature range (unless otherwise noted)(1)
PARAMETER TEST CONDITIONS(1) LP2951(2) LP2950AC-XX
LP2951AC-XX LP2950C-XX
LP2951C-XX UNIT
MIN TYP MAX MIN TYP MAX MIN TYP MAX
3-V VERSIONS(3)
Output voltage
TJ= 25°C 2.985 3 3.015 2.985 3 3.015 2.970 3 3.030 V(4)
25°C TJ85°C 2.970 3 3.030 2.955 3 3.045 V(5)
Full operating
temperature range 2.964 3 3.036 V(4)
2.964 3 3.036 2.940 3 3.060 V(5)
Output voltage 100 µA IL100 mA,
100 µA IL100 mA,
TJTJMAX
2.955 3 3.045 V(4)
2.958 3 3.042 2.928 3 3.072 V(5)
3.3-V VERSIONS(3)
Output voltage
TJ= 25°C 3.284 3.3 3.317 3.284 3.3 3.317 3.267 3.3 3.333 V(4)
25°C TJ85°C 3.3 3.267 3.3 3.333 3.251 3.3 3.350 V(5)
Full operating
temperature range 3.260 3.3 3.340 V(4)
3.260 3.3 3.340 3.234 3.3 3.366 V(5)
Output voltage 100 µA IL100 mA, TJ
TJMAX
3.251 3.3 3.350 V(4)
3.254 3.3 3.346 3.221 3.3 3.379 V(5)
5-V VERSIONS(3)
Output voltage
TJ= 25°C 4.975 5 5.025 4.975 5 5.025 4.95 5 5.05 V(4)
25°C TJ85°C 5 4.95 5 5.05 4.925 5 5.075 V(5)
Full operating
temperature range 4.94 5 5.06 V(4)
4.94 5 5.06 4.9 5 5.1 V(5)
Output voltage 100 µA IL100 mA, TJ
TJMAX
4.925 5 5.075 V(4)
4.925 5 5.075 4.88 5 5.12 V(5)
ALL VOLTAGE OPTIONS
Output voltage
temperature
coefficient See(6), –40°C TJ
125°C 20 120 ppm/°C(4)
20 100 50 150 ppm/°C(5)
Line regulation(7)
(VONOM + 1 V) Vin 30
V(8) 0.03% 0.1% 0.03% 0.11% 0.04% 0.2% See(4)
(VONOM + 1 V) Vin 30
V(8), –40°C TJ125°C 0.03% 0.5% See(4)
0.03% 0.2% 0.04% 0.4% (5)
Load regulation(7) 100 µA IL100 mA 0.04% 0.1% 0.04% 0.1% 0.1% 0.2% See(4)
100 µA IL100 mA,
–40°C TJ125°C 0.04% 0.3% See(4)
0.04% 0.2% 0.1% 0.3% See(5)
8
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Electrical Characteristics (continued)
over operating free-air temperature range (unless otherwise noted)(1)
PARAMETER TEST CONDITIONS(1) LP2951(2) LP2950AC-XX
LP2951AC-XX LP2950C-XX
LP2951C-XX UNIT
MIN TYP MAX MIN TYP MAX MIN TYP MAX
(9) Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured
at 1-V differential. At very low values of programmed output voltage, the minimum input supply voltage of 2 V (2.3 V over temperature)
must be taken into account.
(10) Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load
or line regulation effects. Specifications are for a 50 mA load pulse at VIN = 30 V (1.25-W pulse) for T = 10 ms.
(11) VREF VOUT (VIN 1 V), 2.3 V VIN 30 V, 100 µA IL100 mA, TJTJMAX.
Dropout voltage(9)
IL= 100 µA 50 80 50 80 50 80 mV(4)
IL= 100 µA, –40°C TJ
125°C 150 mV(4)
150 150 mV(5)
IL= 100 mA 380 450 380 450 380 450 mV(4)
IL= 100 mA, –40°C TJ
125°C 600 600 600 mV(4)
600 600 mV(5)
Ground current
IL= 100 µA 75 120 75 120 75 120 µA(4)
IL= 100 µA, –40°C TJ
125°C 140 µA(4)
140 140 µA(5)
IL= 100 mA 8 12 8 12 8 12 mA(4)
IL= 100 mA, –40°C TJ
125°C 14 mA(4)
14 14 mA(5)
Dropout ground
current
VIN = (VONOM 0.5)V, IL
= 100 µA 110 170 110 170 110 170 µA(4)
VIN = (VONOM 0.5 V), IL
= 100 µA, –40°C TJ
125°C
200 200 200 µA(4)
200 200 µA(5)
Current limit VOUT = 0 V 160 200 160 200 160 200 mA(4)
VOUT = 0 V, –40°C TJ
125°C 220 mA(4)
220 220 mA(5)
Thermal regulation See(10) 0.05 0.2 0.05 0.2 0.05 0.2 %/W(4)
Output noise
10 Hz to 100 kHz
CL= 1µF (5 V Only) 430 430 430 µVRMS
CL= 200 µF 160 160 160 µVRMS
CL= 3.3 µF
(Bypass = 0.01 µF
Pins 7 to 1 (LP2951-N) 100 100 100 µVRMS
8-PIN VERSIONS ONLY LP2951 LP2951AC-XX LP2951C-XX
Reference voltage 1.22 1.235 1.25 1.22 1.235 1.25 1.21 1.235 1.26 V(4)
–40°C TJ125°C 1.2 1.26 V(4)
1.2 1.26 1 1.2 1.27 V(5)
Reference voltage See(11), –40°C TJ
125°C 1.19 1.27 V(4)
1.19 1.27 1.185 1.285 V(5)
Feedback pin bias
current
20 40 20 40 20 40 nA(4)
–40°C TJ125°C 60 nA (4)
60 60 nA(5)
Reference voltage
temperature
coefficient See(6) 20 20 50 ppm/°C
Feedback pin bias
current
temperature
coefficient 0.1 0.1 0.1 nA/°C
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Electrical Characteristics (continued)
over operating free-air temperature range (unless otherwise noted)(1)
PARAMETER TEST CONDITIONS(1) LP2951(2) LP2950AC-XX
LP2951AC-XX LP2950C-XX
LP2951C-XX UNIT
MIN TYP MAX MIN TYP MAX MIN TYP MAX
(12) Comparator thresholds are expressed in terms of a voltage differential at the FEEDBACK pin below the nominal reference voltage
measured at VIN = (VO(NOM) + 1) V. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain =
VOUT/VREF = (R1 + R2) / R2.For example, at a programmed output voltage of 5 V, the ERROR output is specified to go low when the
output drops by 95 mV × 5 V / 1.235 V = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout
warning occurring at typically 5% below nominal, 7.5% ensured.
(13) VSHUTDOWN 2 V, VIN 30 V, VOUT = 0, FEEDBACK pin tied to VTAP.
ERROR COMPARATOR
Output leakage
current
VOH = 30 V 0.01 1 0.01 1 0.01 1 µA(4)
VOH = 30 V, –40°C TJ
125°C 2 µA(4)
2 2 µA(5)
Output low voltage
VIN = (VONOM 0.5 V),
IOL = 400 µA 150 250 150 250 150 250 mV(4)
VIN = (VONOM 0.5 V),
IOL = 400 µA,
–40°C TJ125°C
400 400 400 mV(4)
400 400 mV(5)
Upper threshold
voltage
See(12) 40 60 40 60 40 60 mV(4)
See(12), –40°C TJ
125°C 25 mV(4)
25 25 mV(5)
Lower threshold
voltage
See(12) 75 95 75 95 75 95 mV(4)
See(12), –40°C TJ
125°C 140 mV(4)
140 140 mV(5)
Hysteresis See(12) 15 15 15 mV
SHUTDOWN INPUT
Input 1.3 1.3 1.3 V
Logic voltage Low (Regulator ON),
–40°C TJ125°C 0.6 V(4)
0.7 0.7 V(5)
Logic voltage High (Regulator OFF),
–40°C TJ125°C 2 V(4)
2 2 V(5)
Shutdown pin input
current
Vshutdown = 2.4 V 30 50 30 50 30 50 µA(4)
Vshutdown = 2.4 V
–40°C TJ125°C 100 µA(4)
100 100 µA(5)
Vshutdown = 30 V 450 600 450 600 450 600 µA(4)
Vshutdown = 30 V,
–40°C TJ125°C 750 µA(4)
750 750 µA(5)
Regulator output
current in
shutdown
See(13) 3 10 3 10 3 10 µA(4)
–40°C TJ125°C 20 µA(4)
20 20 µA(5)
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7.7 Typical Characteristics
Figure 1. Quiescent Current Figure 2. Dropout Characteristics
Figure 3. Input Current Figure 4. Input Current
Figure 5. Output Voltage vs. Temperature of 3
Representative Units Figure 6. Quiescent Current
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Typical Characteristics (continued)
Figure 7. Quiescent Current Figure 8. Quiescent Current
Figure 9. Quiescent Current Figure 10. Short Circuit Current
Figure 11. Dropout Voltage Figure 12. Dropout Voltage
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Typical Characteristics (continued)
Figure 13. LP2951-N Minimum Operating Voltage Figure 14. LP2951-N Feedback Bias Current
Figure 15. LP2951-N Feedback Pin Current Figure 16. LP2951-N Error Comparator Output
Figure 17. LP2951-N Comparator Sink Current Figure 18. LP2951-N Enable Transient
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Typical Characteristics (continued)
Figure 19. Output Impedance Figure 20. Ripple Rejection
Figure 21. Ripple Rejection Figure 22. Ripple Rejection
Figure 23. LP2951-N Output Noise Figure 24. LP2951-N Divider Resistance
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Typical Characteristics (continued)
Figure 25. Shutdown Threshold Voltage Figure 26. Line Regulation
Figure 27. LP2951-N Maximum Rated Output Current Figure 28. LP2950-N Maximum Rated Output Current
Figure 29. Thermal Response Figure 30. Output Capacitor ESR Range
0 5 10 15 20 25 30
0
20
40
60
80
100
120
INPUT PIN CURRENT, IIN(A)
INPUT PIN VOLTAGE, VIN(V)
VSD= 2.0V
Output Load = Open
Ta= -50°C
Ta= -40°C
Ta= +25°C
Ta= +125°C
0 5 10 15 20 25 30
0
20
40
60
80
100
120
INPUT PIN CURRENT, IIN(A)
INPUT PIN VOLTAGE, VIN(V)
VSD= 2.0V
Output Load = Short to Ground
Ta= -50°C
Ta= -40°C
Ta= +25°C
Ta= +125°C
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Typical Characteristics (continued)
Figure 31. LP2951-N Input Pin Current vs Input Voltage Figure 32. LP2951-N Input Pin Current vs Input Voltage
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8 Detailed Description
8.1 Overview
The LP2950-N and LP2951-N are very high accuracy micro power voltage regulators with low quiescent current
(75 µA typical) and low dropout voltage (typical 40 mV at light loads and 380 mV at 100 mA). They are ideally
suited for use in battery-powered systems.
The LP2950-N and LP2951-N block diagram contains several features, including:
Very high accuracy 1.23-V reference;
Fixed 5-V, 3-V, and 3.3-V versions; and
Internal protection circuitry, such as foldback current limit, and thermal shutdown.
The LP2951-N VERSIONS ONLY:
Fixed 5-V, 3-V, and 3.3-V versions and programmable output version from 1.24 V to 29 V with an external
pair of resistors;
Shutdown input, allowing turn off the regulator when the SHUTDOWN pin is pulled low; and
Error flag output, which may be used for a power-on reset.
8.2 Functional Block Diagrams
Figure 33. LP2950-N Functional Block Diagram
Figure 34. LP2951-N Functional Block Diagram
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8.3 Feature Description
8.3.1 Fixed Voltage Options and Programmable Voltage Version
The LP2950-N and LP2951-N provide 3 fixed output options: 3 V, 3.3 V, and 5 V. Please consult factory for
custom voltages. In order to meet different application requirements, LP2951-N can also be used as a
programmable voltage regulator, with an external resistors network; please refer to Application and
Implementation for more details.
8.3.2 High Accuracy Output Voltage
With special carful design to minimize all contributions to the output voltage error, the LP2950-N/LP2951-N
distinguished itself as a very high output voltage accuracy micro power LDO. This includes a tight initial tolerance
(0.5% typical), extremely good load and line regulation (.05% typical) and a very low output voltage temperature
coefficient, making the part an ideal a low-power voltage reference.
8.3.3 Low Dropout Voltage
Generally speaking, the dropout voltage often refers to the voltage difference between the input and output
voltage (VDO = VIN VOUT), where the main current pass-FET is fully on in the ohmic region of operation and is
characterized by the classic RDS(ON) of the FET. VDO indirectly specifies a minimum input voltage above the
nominal programmed output voltage at which the output voltage is expected to remain within its accuracy
boundary.
8.3.4 Shutdown Mode
When the SHUTDOWN pin is pulled to high level, LP2951-N enters shutdown mode and a very low quiescent
current is consumed. This function is designed for the application which needs a shutdown mode to effectively
enhance battery life cycle.
8.3.5 Error Detection Comparator Output
The LP2951-N generates a logic low output whenever its output falls out of regulation by more than
approximately 5%. Please refer to Application and Implementation for more details.
8.3.6 Internal Protection Circuitry
8.3.6.1 Short-Circuit Protection (Current Limit)
The internal current limit circuit is used to protect the LDO against high-load current faults or shorting events. The
LDO is not designed to operate in a steady-state current limit. During a current-limit event, the LDO sources
constant current. Therefore, the output voltage falls when load impedance decreases. Note also that if a current
limit occurs and the resulting output voltage is low, excessive power may be dissipated across the LDO, resulting
in a thermal shutdown of the output. A fold back feature limits the short-circuit current to protect the regulator
from damage under all load conditions. If OUT is forced below 0 V before EN goes high and the load current
required exceeds the fold back current limit, the device may not start up correctly.
8.3.6.2 Thermal Protection
The device contains a thermal shutdown protection circuit to turn off the output current when excessive heat is
dissipated in the LDO. The thermal time-constant of the semiconductor die is fairly short, and thus the output
cycles on and off at a high rate when thermal shutdown is reached until the power dissipation is reduced. The
internal protection circuitry of the device is designed to protect against thermal overload conditions. The circuitry
is not intended to replace proper heat sinking. Continuously running the device into thermal shutdown degrades
its reliability.
8.3.7 Enhanced Stability
The LP2950-N and LP2951-N is designed specifically to work with ceramic output capacitors, utilizing circuitry
which allows the regulator to be stable across the entire range of output current with an output capacitor whose
ESR is as low as 6 mΩ. For output capacitor requirement, please refer to Application and Implementation.
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8.4 Device Functional Modes
8.4.1 Operation with 30 V VIN > VOUT(TARGET)+1V
The device operate if the input voltage is equal to, or exceeds VOUT(TARGET) + 1 V. At input voltages below the
minimum VIN requirement, the devices do not operate correctly and output voltage may not reach target value.
8.4.2 Operation with Shutdown Control
If the voltage on the SHUTDOWN pin is higher than 1.3 V, the device is disabled. Decreasing shutdown below
0.7 V initiates the start-up sequence of the device.
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9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The LP2950-N and LP2951-N are linear voltage regulator operating from 2.3 V to 30 V on the input and
regulates voltages between 1.24 V to 29 V with 0.5% accuracy and 160 mA maximum outputs current. Efficiency
is defined by the ratio of output voltage to input voltage because the LP2950-N and LP2951-N is a linear voltage
regulator. To achieve high efficiency, the dropout voltage (VIN VOUT) must be as small as possible, thus
requiring a very low dropout LDO. Successfully implementing an LDO in an application depends on the
application requirements. If the requirements are simply input voltage and output voltage, compliance
specifications (such as internal power dissipation or stability) must be verified to ensure a solid design. If timing,
start-up, noise, PSRR, or any other transient specification is required, the design becomes more challenging.
Figure 35. Schematic Diagram
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9.2 Typical Applications
9.2.1 1-A Regulator with 1.2-V Dropout
Figure 36. 1-A Regulator with 1.2-V Dropout
9.2.1.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 1. Design Parameters
DESIGN PARAMETER DESIGN REQUIREMENT
Input voltage 6.5 V, ±10%, provided by the DC-DC converter switching at 1 MHz
Output voltage 5 V, ±1%
Output current 100 mA (maximum), 1 mA (minimum)
RMS noise, 10 Hz to 100 kHz < 200 µVRMS
PSRR at 1 KHz > 50 dB
9.2.1.2 Detailed Design Procedure
At 100-mA loading, the dropout of the LP2950-N/LP2951-N has 600 mV maximum dropout over temperature,
thus an 1500-mV headroom is sufficient for operation over both input and output voltage accuracy. The efficiency
of the LP2950-N/LP2951-N in this configuration is VOUT / VIN = 76.9%. To achieve the smallest form factor, the
TO-92 package is selected. Input and output capacitors are selected in accordance with the Capacitor
Recommendation section. Ceramic capacitances of 1 µF for the input and one 2.2-µF capacitors for the output
are selected. With an efficiency of 73.3% and a 100-mA maximum load, the internal power dissipation is 150
mW, which corresponds to a 18.9°C junction temperature rise for the TO-92 package. With an 85°C maximum
ambient temperature, the junction temperature is at 103.9°C. To minimize noise, a bypass capacitance (CBYPASS)
of 0.01-µF is selected between pin 7 to pin 1 for LP2951-N.
9.2.1.2.1 Output Capacitor Requirements
A 1-µF (or greater) capacitor is required between the output and ground for stability at output voltages of 5 V or
higher. At lower output voltages, more capacitance is required (2.2 µF or more is recommended for 3-V and
3.3-V versions). Without this capacitor the device oscillates. Most types of tantalum or aluminum electrolytic work
fine here; even film types work but are not recommended for reasons of cost. Many aluminum electrolytics have
electrolytes that freeze at about 30°C, so solid tantalums are recommended for operation below 25°C. The
important parameters of the capacitor are an ESR of about 5 Ωor less and a resonant frequency above 500 kHz.
The value of this capacitor may be increased without limit.
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Figure 37. Output Capacitor ESR Range
The reason for the lower ESR limit is that the loop compensation of the feedback loop relies on the capacitance
value and the ESR value of the output capacitor to provide the zero that gives added phase lead (See
Figure 37).
fZ= (1 / (2 × π× COUT × ESR)) (1)
Using the 2.2 µF value from the Output Capacitor ESR Range curve (Figure 37), a useful range for fZcan be
estimated:
fZ(MIN)= (1 / (2 x π× 2.2 µF x 5 )) = 14.5 kHz (2)
fZ(MAX)= (1 / (2 x π× 2.2 µF x 0.05 )) = 318 kHz (3)
For ceramic capacitors, the low ESR produces a zero at a frequency that is too high to be useful, so meaningful
phase lead does not occur. A ceramic output capacitor can be used if a series resistance is added
(recommended value of resistance about 0.1 to 2 ) to simulate the needed ESR. Only X5R, X7R, or better,
MLCC types should be used, and should have a DC voltage rating at least twice the VOUT(NOM) value.
At lower values of output current, less output capacitance is required for stability. The capacitor can be reduced
to 0.33 µF for currents below 10 mA or 0.1 µF for currents below 1 mA. Using the adjustable versions at voltages
below 5 V runs the error amplifier at lower gains so that more output capacitance is needed. For the worst-case
situation of a 100-mA load at 1.23 V output (output shorted to Feedback) a 3.3-µF (or greater) capacitor should
be used.
Unlike many other regulators, the LP2950-N remains stable and in regulation with no load in addition to the
internal voltage divider. This is especially important in CMOS RAM keep-alive applications. When setting the
output voltage of the LP2951-N versions with external resistors, a minimum load of 1 µA is recommended.
Applications having conditions that may drive the LP2950-N/51 into nonlinear operation require special
consideration. Nonlinear operation occurs when the output voltage is held low enough to force the output stage
into output current limiting while trying to pull the output voltage up to the regulated value. The internal loop
response time controls how long it takes for the device to regain linear operation when the output has returned to
the normal operating range. There are three significant nonlinear conditions that need to be considered, all can
force the output stage into output current limiting mode, all can cause the output voltage to over-shoot with low
value output capacitors when the condition is removed, and the recommended generic solution is to set the
output capacitor to a value not less than 10 µF. Although the 10 µF value for COUT may not eliminate the output
voltage over-shoot in all cases, it should lower it to acceptable levels (< 10% of VOUT(NOM)) in the majority of
cases. In all three of these conditions, applications with lighter load currents are more susceptible to output
voltage over-shoot than applications with higher load currents.
1. At power-up, with the input voltage rising faster than output stage can charge the output capacitor.
VIN tRISE(MIN) > ((COUT / 100 mA) × ΔVIN)
where
ΔVIN = VOUT(NOM) + 1 V (4)
2. Recovery from an output short circuit to ground condition.
COUT(MIN) (160 mA ILOAD(NOM))/((VOUT(NOM)/10)/25 µs)) (5)
3. Toggling the LP2951-N SHUTDOWN pin from high (OFF) to low (ON).
COUT(MIN) (160 mA ILOAD(NOM))/((VOUT(NOM)/10)/25 µs)) (6)
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Figure 38. LP2951-N Enable Transient
9.2.1.2.2 Input Capacitor Requirements
A minimum 1 µF tantalum, ceramic or aluminum electrolytic capacitor should be placed from the LP2950-
N/LP2951-N input pin to ground if there is more than 10 inches of wire between the input and the AC filter
capacitor or if a battery is used as the input.
9.2.1.2.3 Error Detection Comparator Output
The comparator produces a logic low output whenever the LP2951-N output falls out of regulation by more than
approximately 5%. This figure is the comparator's built-in offset of about 60 mV divided by the 1.235 reference
voltage. (Refer to the block diagram in the front of the datasheet.) This trip level remains “5% below normal”
regardless of the programmed output voltage of the 2951. For example, the error flag trip level is typically 4.75 V
for a 5-V output or 11.4 V for a 12-V output. The out of regulation condition may be due either to low input
voltage, current limiting, or thermal limiting.
Figure 39 below gives a timing diagram depicting the ERROR signal and the regulated output voltage as the
LP2951-N input is ramped up and down. For 5 V versions, the ERROR signal becomes valid (low) at about 1.3-V
input. It goes high at about 5-V input (the input voltage at which VOUT = 4.75 V). Because the LP2951-N dropout
voltage is load-dependent (see curve in typical performance characteristics), the input voltage trip point (about
5 V) varies with the load current. The output voltage trip point (approx. 4.75 V) does not vary with load.
The error comparator has an open-collector output which requires an external pull up resistor. This resistor may
be returned to the output or some other supply voltage depending on system requirements. In determining a
value for this resistor, note that while the output is rated to sink 400 µA, this sink current adds to battery drain in
a low battery condition. Suggested values range from 100 k to 1 MΩ. The resistor is not required if this output is
unused.
*When VIN 1.3 V, the error flag pin becomes a high impedance, and the error flag voltage rises to its pullup voltage.
Using VOUT as the pullup voltage (see Figure 40), rather than an external 5-V source, keeps the error flag voltage
under 1.2 V (typical) in this condition. The user may wish to divide down the error flag voltage using equal-value
resistors (10 ksuggested), to ensure a low-level logic signal during any fault condition, while still allowing a valid
high logic level during normal operation.
Figure 39. ERROR Output Timing
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9.2.1.2.4 Programming the Output Voltage (LP2951-N)
The LP2951-N may be pin-strapped for the nominal fixed output voltage using its internal voltage divider by tying
the output and sense pins together, and also tying the FEEDBACK and VTAP pins together. Alternatively, it may
be programmed for any output voltage between its 1.235-V reference and its 30-V maximum rating. As seen in
Figure 40, an external pair of resistors is required.
The complete equation for the output voltage is
where
VREF is the nominal 1.235-V reference voltage and IFB is the FEEDBACK pin bias current, nominally –20 nA (7)
The minimum recommended load current of 1 µA forces an upper limit of 1.2 MΩon the value of R2, if the
regulator must work with no load (a condition often found in CMOS in standby). IFB produces a 2% typical error in
VOUT which may be eliminated at room temperature by trimming R1. For better accuracy, choosing R2= 100 k
reduces this error to 0.17% while increasing the resistor program current to 12 µA. Because the LP2951-N
typically draws 60 µA at no load with pin 2 open-circuited, this is a small price to pay.
*Drive with TTL-high to shut down. Ground or leave open if shutdown feature is not to be used.
Note: Pins 2 and 6 are left open.
Figure 40. Adjustable Regulator
Stray capacitance to the LP2951-N FEEDBACK pin can cause instability. This may especially be a problem
when using high value external resistors to set the output voltage. Adding a 100-pF capacitor between the OUT
pin and the FEEDBACK pin, and increasing the output capacitor to at least 3.3 µF, fixes this problem.
9.2.1.2.5 Reducing Output Noise
In reference applications it may be advantageous to reduce the AC noise present at the output. One method is to
reduce the regulator bandwidth by increasing the size of the output capacitor. This is the only way noise can be
reduced on the 3-lead LP2950-N but is relatively inefficient, as increasing the capacitor from 1 µF to 220 µF only
decreases the noise from 430 µVRMS to 160 µVRMS for a 100-kHz bandwidth at 5-V output.
Noise can be reduced fourfold by a bypass capacitor across R1, because it reduces the high frequency gain from
4 to unity. Pick
(8)
or about 0.01 µF. When doing this, the output capacitor must be increased to 3.3 µF to maintain stability. These
changes reduce the output noise from 430 µV to 100 µV rms for a 100-kHz bandwidth at 5-V output. With the
bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at
higher output voltages.
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9.2.1.3 Application Curves
Figure 41. Line Transient Response Figure 42. Load Transient Response
Figure 43. Load Transient Response
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9.2.2 300-mA Regulator with 0.75-V Dropout
In Figure 44, by paralleling the LP2951 together with 2x2N5432 (150-mA N channel JFET), a user can get a
higher output current capability around 300 mA.
Figure 44. 300-mA Regulator with 0.75-V Dropout
9.2.3 Wide Input Voltage Range Current Limiter
The LP2951 can be used as a 160-mA current limiter as Figure 45. When FB is connected to ground, the pass
element is fully turned on and out voltage will be close to input voltage. Input-output voltage ranges from 40 mV
to 400 mV, depending on load current.
*Minimum input-output voltage ranges from 40 mV to 400 mV, depending on load current. Current limit is typically
160 mA.
Figure 45. Wide Input Voltage Range Current Limiter
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9.2.4 Low Drift Current Source
The LP2951 can be used as a low drift current source as Figure 46 shows. By connected Vout to FB, Vout will
regulated at 1.235 V, and current consumption at R is IL= 1.23/R.
Figure 46. Low Drift Current Source
9.2.5 5-V Current Limiter
The LP2950 internal current limit function can be leveraged to build 5-V current limiter as Figure 47 shows. The
minimum input-output voltage ranges from 40 mV to 400 mV, depending on load current. Current limit is typically
160 mA.
*Minimum input-output voltage ranges from 40 mV to 400 mV, depending on load current. Current limit is typically
160 mA.
Figure 47. 5-V Current Limiter
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9.2.6 Regulator with Early Warning and Auxiliary Output
The LP2951 can be used to build a Regulator with early warning and auxiliary output as Figure 48 shows. it has
below features:
Early warning flag on low input voltage
Main output latches off at lower input voltages
Battery backup on auxiliary output
Operation: VOUT of regulator 1 is programmed one diode drop above 5 V. Its error flag becomes active when
VIN 5.7 V. When VIN drops below 5.3 V, the error flag of regulator 2 becomes active and via Q1 latches the
main output off. When VIN again exceeds 5.7 V regulator 1 is back in regulation and the early warning signal
rises, unlatching regulator 2 via D3.
Figure 48. Regulator With Early Warning and Auxiliary Output
9.2.7 Latch Off When Error Flag Occurs
As Figure 49 presents, a latch off when error flag occurs circuit works in below two mode:
When output is within ±95% of VOUT option, the error flag pin keep output high, which turns off PNP bipolar and
pulls SD pin to low, then the LP2951 keeps output regulated voltage.
When output drop to less than 95% of VOUT option, it triggers error flag output a low voltage, which turns on PNP
bipolar and pulls SD pin to high, then the device enters shutdown mode and turns off output voltage. During a
shutdown sequence, the ERROR pin continues output low, and the LP2951 device latches in shutdown mode.
Figure 49. Latch Off When Error Flag Occurs
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9.2.8 2-A Low Dropout Regulator
As Figure 50 shows, the 2-A low dropout regulator has below features:
For 5 VOUT, use internal resistors. Wire pin 6 to pin 7 and wire pin 2 to + VOUT bus.
Figure 50. 2-A Low Dropout Regulator
9.2.9 5-V Regulator with 2.5-V Sleep Function
In Figure 51, the 5-V regulator with 2.5-V sleep function works in below mode:
When sleep input is low, C-MOS output a high voltage and 2N3906 is off, then Vout = (1 + 300 KΩ/100 KΩ)×VFB
5 V
when sleep input is high, C-MOS output a low voltage, turns on 2N3906, then 200-KΩresistor is bypassed from
circuit, and VOUT = (1+100 KΩ/100 KΩ)×VFB 2.5 V.
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*High input lowers Vout to 2.5 V.
Figure 51. 5-V Regulator with 2.5-V Sleep Function
9.2.10 Open Circuit Detector for 4 20-mA Current Loop
Figure 52 shows the open circuit detector for 4 20-mA current loop. The circuit outputs a high level while input
current is less than 3.5 mA.
Figure 52. Open Circuit Detector for 4 20-mA Current Loop
9.2.11 Regulator with State-of-Charge Indicator
In Figure 53, the LP339, a quad comparator, is used to indicate battery voltage state. The comparator’s negative
input voltage is equal to the LP2951 1.235-V feedback voltage. By adjusting R3, we can adjust positive input
voltage of C1~C3 to target value.
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*Optional latch off when drop out occurs. Adjust R3 for C2 Switching when Vin is 6 V.
**Outputs go low when VIN drops below designated thresholds.
Figure 53. Regulator with State-of-Charge Indicator
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9.2.12 Low Battery Disconnect
In Figure 54, a band-gap voltage reference LM385 is used to generate shutdown signal, when Vin < 5.5 V, the
LP2951 turns off and turns on again when VIN > 6 V.
For values shown, regulator shuts down when Vin < 5.5 V and turns on again at 6 V. Current drain in disconnected
mode is approximately 150 µA.
*Sets disconnect voltage.
**Sets disconnect hysteresis.
Figure 54. Low Battery Disconnect
9.2.13 System Overtemperature Protection Circuit
In Figure 55, temperature sensors LM34/35's output voltage is linearly proportional to the Celsius (Centigrade)
temperature.
At room temperature, LM34/35's output voltage is lower than 1.235-V feedback voltage, the internal pass
transistor fully turns on, and the LP2951 output voltage is close to VIN.
When ambient temperature raise higher than protection target, LM34/35's output voltage is higher than 1.235-V
feedback voltage, the internal pass transistor turns off, and the LP2951 output goes off.
LM34 for 125°F shutdown
LM35 for 125°C shutdown
Figure 55. System Overtemperature Protection Circuit
12 3
IN
GND
OUT
VIN
Input
Capacitor VOUT
Output
Capacitor
Ground
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10 Power Supply Recommendations
The LP2950-N and LP2951-N are designed to operate from an input voltage supply range between 2.3 V and
30 V. The input voltage range provides adequate headroom in order for the device to have a regulated output.
This input supply must be well regulated. If the input supply is noisy, additional input capacitors with low ESR can
help improve the output noise performance.
11 Layout
11.1 Layout Guidelines
For best overall performance, place all circuit components on the same side of the circuit board and as near as
practical to the respective LDO pin connections. Place ground return connections to the input and output
capacitor, and to the LDO ground pin as close to each other as possible, connected by a wide, component-side,
copper surface. The use of vias and long traces to create LDO circuit connections is strongly discouraged and
negatively affects system performance. This grounding and layout scheme minimizes inductive parasitics, and
thereby reduces load-current transients, minimizes noise, and increases circuit stability.
A ground reference plane is also recommended and is either embedded in the PCB itself or located on the
bottom side of the PCB opposite the components. This reference plane serves to assure accuracy of the output
voltage, shield noise, and behaves similar to a thermal plane to spread (or sink) heat from the LDO device. In
most applications, this ground plane is necessary to meet thermal requirements.
11.2 Layout Example
Figure 56. LP2950 Board Layout Figure 57. LP2951 VSSOP Board Layout
VOUT
VIN
Input
Capacitor
Output
Capacitor
OUT
SENSE
SHUTDOWN
GND ERROR
IN
VTAP
FEEDBACK
Error Pullup
Resistor VOUT
Ground
Ground
1
2
3
4 5
6
7
8
Exposed
Thermal Pad
6 Thermal Vias
33
LP2950-N
,
LP2951-N
www.ti.com
SNVS764Q JANUARY 2000REVISED DECEMBER 2017
Product Folder Links: LP2950-N LP2951-N
Submit Documentation FeedbackCopyright © 2000–2017, Texas Instruments Incorporated
Layout Example (continued)
Figure 58. LP2951 WSON Board Layout
11.3 WSON Mounting
The NGT (no pullback) 8-lead WSON package requires specific mounting techniques which are detailed in AN-
1187 Leadless Leadframe Package (LLP). Referring to the PCB Design Recommendations section, note that the
pad style which should be used with the WSON package is the NSMD (non-solder mask defined) type.
Additionally, TI recommends that the PCB terminal pads to be 0.2 mm longer than the package pads to create a
solder fillet to improve reliability and inspection.
The thermal dissipation of the WSON package is directly related to the printed circuit board construction and the
amount of additional copper area connected to the DAP.
For the LP2951-N in the NGT 8-lead WSON package, the junction-to-case thermal rating, RθJC, is 35°C/W, where
the case is the bottom of the package at the center of the DAP.
The DAP (exposed pad) on the bottom of the WSON package is connected to the die substrate with a conductive
die attach adhesive. The DAP has no direct electrical (wire) connection to any of the eight pins. There is a
parasitic PN junction between the die substrate and the device ground. As such, it is strongly recommend that
the DAP be connected directly to the ground at device lead 4 (that is, GND). Alternately, but not recommended,
the DAP may be left floating (that is, no electrical connection). The DAP must not be connected to any potential
other than ground.
34
LP2950-N
,
LP2951-N
SNVS764Q JANUARY 2000REVISED DECEMBER 2017
www.ti.com
Product Folder Links: LP2950-N LP2951-N
Submit Documentation Feedback Copyright © 2000–2017, Texas Instruments Incorporated
12 Device and Documentation Support
12.1 Documentation Support
12.1.1 Related Documentation
For related documentation, see the following:
AN-1187 Leadless Leadframe Package (LLP)
12.2 Related Links
Table 2 lists quick access links. Categories include technical documents, support and community resources,
tools and software, and quick access to sample or buy.
Table 2. Related Links
PARTS PRODUCT FOLDER SAMPLE & BUY TECHNICAL
DOCUMENTS TOOLS &
SOFTWARE SUPPORT &
COMMUNITY
LP2950-N Click here Click here Click here Click here Click here
LP2951-N Click here Click here Click here Click here Click here
12.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.4 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.5 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
12.6 Glossary
SLYZ022 TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
PACKAGE OPTION ADDENDUM
www.ti.com 25-May-2018
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LP2950ACZ-3.0/NOPB ACTIVE TO-92 LP 3 1800 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type -40 to 125 2950A
CZ3.0
LP2950ACZ-3.3/NOPB ACTIVE TO-92 LP 3 1800 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type -40 to 125 2950A
CZ3.3
LP2950ACZ-5.0/LFT1 ACTIVE TO-92 LP 3 2000 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type 2950A
CZ5.0
LP2950ACZ-5.0/LFT3 ACTIVE TO-92 LP 3 2000 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type 2950A
CZ5.0
LP2950ACZ-5.0/LFT7 ACTIVE TO-92 LP 3 2000 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type 2950A
CZ5.0
LP2950ACZ-5.0/NOPB ACTIVE TO-92 LP 3 1800 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type -40 to 125 2950A
CZ5.0
LP2950CDT-3.0/NOPB ACTIVE TO-252 NDP 3 75 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR -40 to 125 LP2950
CDT-3.0
LP2950CDT-3.3 NRND TO-252 NDP 3 75 TBD Call TI Call TI -40 to 125 LP2950
CDT-3.3
LP2950CDT-3.3/NOPB ACTIVE TO-252 NDP 3 75 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR -40 to 125 LP2950
CDT-3.3
LP2950CDT-5.0/NOPB ACTIVE TO-252 NDP 3 75 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR -40 to 125 LP2950
CDT-5.0
LP2950CDTX-3.0/NOPB ACTIVE TO-252 NDP 3 2500 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR -40 to 125 LP2950
CDT-3.0
LP2950CDTX-3.3/NOPB ACTIVE TO-252 NDP 3 2500 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR -40 to 125 LP2950
CDT-3.3
LP2950CDTX-5.0 NRND TO-252 NDP 3 2500 TBD Call TI Call TI -40 to 125 LP2950
CDT-5.0
LP2950CDTX-5.0/NOPB ACTIVE TO-252 NDP 3 2500 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR -40 to 125 LP2950
CDT-5.0
LP2950CZ-3.0/NOPB ACTIVE TO-92 LP 3 1800 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type -40 to 125 2950
CZ3.0
LP2950CZ-3.3/LFT3 ACTIVE TO-92 LP 3 2000 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type 2950
CZ3.3
LP2950CZ-3.3/NOPB ACTIVE TO-92 LP 3 1800 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type -40 to 125 2950
CZ3.3
PACKAGE OPTION ADDENDUM
www.ti.com 25-May-2018
Addendum-Page 2
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LP2950CZ-5.0/LFT1 ACTIVE TO-92 LP 3 2000 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type 2950
CZ5.0
LP2950CZ-5.0/LFT3 ACTIVE TO-92 LP 3 2000 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type 2950
CZ5.0
LP2950CZ-5.0/LFT7 ACTIVE TO-92 LP 3 2000 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type 2950
CZ5.0
LP2950CZ-5.0/NOPB ACTIVE TO-92 LP 3 1800 Green (RoHS
& no Sb/Br) CU SN N / A for Pkg Type -40 to 125 2950
CZ5.0
LP2951ACM NRND SOIC D 8 95 TBD Call TI Call TI -40 to 125 2951
ACMC
LP2951ACM-3.0/NOPB ACTIVE SOIC D 8 95 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951A
CM30C
LP2951ACM-3.3 NRND SOIC D 8 95 TBD Call TI Call TI -40 to 125 2951A
CM33C
LP2951ACM-3.3/NOPB ACTIVE SOIC D 8 95 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951A
(CM33>D, CM33C)
LP2951ACM/NOPB ACTIVE SOIC D 8 95 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951
ACM>D
LP2951ACMM NRND VSSOP DGK 8 1000 TBD Call TI Call TI -40 to 125 L0DA
LP2951ACMM-3.0 NRND VSSOP DGK 8 1000 TBD Call TI Call TI -40 to 125 L0BA
LP2951ACMM-3.0/NOPB ACTIVE VSSOP DGK 8 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0BA
LP2951ACMM-3.3 NRND VSSOP DGK 8 1000 TBD Call TI Call TI -40 to 125 L0CA
LP2951ACMM-3.3/NOPB ACTIVE VSSOP DGK 8 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0CA
LP2951ACMM/NOPB ACTIVE VSSOP DGK 8 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0DA
LP2951ACMMX-3.0/NOPB ACTIVE VSSOP DGK 8 3500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0BA
LP2951ACMMX-3.3/NOPB ACTIVE VSSOP DGK 8 3500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0CA
LP2951ACMMX/NOPB ACTIVE VSSOP DGK 8 3500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0DA
LP2951ACMX NRND SOIC D 8 2500 TBD Call TI Call TI -40 to 125 2951
(ACM>D, ACMC)
PACKAGE OPTION ADDENDUM
www.ti.com 25-May-2018
Addendum-Page 3
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LP2951ACMX-3.0/NOPB ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951A
CM30C
LP2951ACMX-3.3/NOPB ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951A
(CM33>D, CM33C)
LP2951ACMX/NOPB ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951
(ACM>D, ACMC)
LP2951ACN/NOPB ACTIVE PDIP P 8 40 Green (RoHS
& no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LP
2951ACN
LP2951ACSD NRND WSON NGT 8 1000 TBD Call TI Call TI -40 to 125 2951AC
LP2951ACSD/NOPB ACTIVE WSON NGT 8 1000 Green (RoHS
& no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 2951AC
LP2951ACSDX-3.3/NOPB ACTIVE WSON NGT 8 4500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 51AC33
LP2951ACSDX/NOPB ACTIVE WSON NGT 8 4500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951AC
LP2951CM NRND SOIC D 8 95 TBD Call TI Call TI -40 to 125 2951
CMC
LP2951CM-3.0/NOPB ACTIVE SOIC D 8 95 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951C
M30C
LP2951CM-3.3 NRND SOIC D 8 95 TBD Call TI Call TI -40 to 125 2951C
M33C
LP2951CM-3.3/NOPB ACTIVE SOIC D 8 95 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951C
M33>D
LP2951CM/NOPB ACTIVE SOIC D 8 95 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951
(CM>D, CMC)
LP2951CMM NRND VSSOP DGK 8 1000 TBD Call TI Call TI -40 to 125 L0DB
LP2951CMM-3.0/NOPB ACTIVE VSSOP DGK 8 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0BB
LP2951CMM-3.3/NOPB ACTIVE VSSOP DGK 8 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0CB
LP2951CMM/NOPB ACTIVE VSSOP DGK 8 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0DB
LP2951CMMX NRND VSSOP DGK 8 3500 TBD Call TI Call TI -40 to 125 L0DB
LP2951CMMX-3.0/NOPB ACTIVE VSSOP DGK 8 3500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0BB
PACKAGE OPTION ADDENDUM
www.ti.com 25-May-2018
Addendum-Page 4
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LP2951CMMX-3.3/NOPB ACTIVE VSSOP DGK 8 3500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0CB
LP2951CMMX/NOPB ACTIVE VSSOP DGK 8 3500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0DB
LP2951CMX NRND SOIC D 8 2500 TBD Call TI Call TI -40 to 125 2951
(CM>D, CMC)
LP2951CMX-3.0/NOPB ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951C
M30C
LP2951CMX-3.3/NOPB ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951C
(M33>D, M33C)
LP2951CMX/NOPB ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2951
CM>D
LP2951CN/NOPB ACTIVE PDIP P 8 40 Green (RoHS
& no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LP
2951CN
LP2951CSD-3.0/NOPB ACTIVE WSON NGT 8 1000 Green (RoHS
& no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 51AC30B
LP2951CSD-3.3/NOPB ACTIVE WSON NGT 8 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 51AC33B
LP2951CSD/NOPB ACTIVE WSON NGT 8 1000 Green (RoHS
& no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 2951ACB
LP2951CSDX-3.3/NOPB ACTIVE WSON NGT 8 4500 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 51AC33B
LP2951CSDX/NOPB ACTIVE WSON NGT 8 4500 Green (RoHS
& no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 2951ACB
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
PACKAGE OPTION ADDENDUM
www.ti.com 25-May-2018
Addendum-Page 5
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF LP2951-N :
Automotive: LP2951-Q1
NOTE: Qualified Version Definitions:
Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LP2950CDTX-3.0/NOPB TO-252 NDP 3 2500 330.0 16.4 6.9 10.5 2.7 8.0 16.0 Q2
LP2950CDTX-3.3/NOPB TO-252 NDP 3 2500 330.0 16.4 6.9 10.5 2.7 8.0 16.0 Q2
LP2950CDTX-5.0 TO-252 NDP 3 2500 330.0 16.4 6.9 10.5 2.7 8.0 16.0 Q2
LP2950CDTX-5.0/NOPB TO-252 NDP 3 2500 330.0 16.4 6.9 10.5 2.7 8.0 16.0 Q2
LP2951ACMM VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951ACMM-3.0 VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951ACMM-3.0/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951ACMM-3.3 VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951ACMM-3.3/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951ACMM/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951ACMMX-3.0/NOP
BVSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951ACMMX-3.3/NOP
BVSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951ACMMX/NOPB VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951ACMX SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
LP2951ACMX-3.0/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
LP2951ACMX-3.3/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
LP2951ACMX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 18-May-2018
Pack Materials-Page 1
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LP2951ACSD WSON NGT 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LP2951ACSD/NOPB WSON NGT 8 1000 180.0 12.4 4.3 4.3 1.1 8.0 12.0 Q1
LP2951ACSDX-3.3/NOPB WSON NGT 8 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LP2951ACSDX/NOPB WSON NGT 8 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LP2951CMM VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951CMM-3.0/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951CMM-3.3/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951CMM/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951CMMX VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951CMMX-3.0/NOPB VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951CMMX-3.3/NOPB VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951CMMX/NOPB VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1
LP2951CMX SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
LP2951CMX-3.0/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
LP2951CMX-3.3/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
LP2951CMX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
LP2951CSD-3.0/NOPB WSON NGT 8 1000 180.0 12.4 4.3 4.3 1.1 8.0 12.0 Q1
LP2951CSD-3.3/NOPB WSON NGT 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LP2951CSD/NOPB WSON NGT 8 1000 180.0 12.4 4.3 4.3 1.1 8.0 12.0 Q1
LP2951CSDX-3.3/NOPB WSON NGT 8 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1
LP2951CSDX/NOPB WSON NGT 8 4500 330.0 12.4 4.3 4.3 1.1 8.0 12.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 18-May-2018
Pack Materials-Page 2
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LP2950CDTX-3.0/NOPB TO-252 NDP 3 2500 367.0 367.0 38.0
LP2950CDTX-3.3/NOPB TO-252 NDP 3 2500 367.0 367.0 38.0
LP2950CDTX-5.0 TO-252 NDP 3 2500 367.0 367.0 35.0
LP2950CDTX-5.0/NOPB TO-252 NDP 3 2500 367.0 367.0 38.0
LP2951ACMM VSSOP DGK 8 1000 210.0 185.0 35.0
LP2951ACMM-3.0 VSSOP DGK 8 1000 210.0 185.0 35.0
LP2951ACMM-3.0/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0
LP2951ACMM-3.3 VSSOP DGK 8 1000 210.0 185.0 35.0
LP2951ACMM-3.3/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0
LP2951ACMM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0
LP2951ACMMX-3.0/NOPB VSSOP DGK 8 3500 367.0 367.0 35.0
LP2951ACMMX-3.3/NOPB VSSOP DGK 8 3500 367.0 367.0 35.0
LP2951ACMMX/NOPB VSSOP DGK 8 3500 367.0 367.0 35.0
LP2951ACMX SOIC D 8 2500 367.0 367.0 35.0
LP2951ACMX-3.0/NOPB SOIC D 8 2500 367.0 367.0 35.0
LP2951ACMX-3.3/NOPB SOIC D 8 2500 367.0 367.0 35.0
LP2951ACMX/NOPB SOIC D 8 2500 367.0 367.0 35.0
LP2951ACSD WSON NGT 8 1000 210.0 185.0 35.0
LP2951ACSD/NOPB WSON NGT 8 1000 203.0 203.0 35.0
LP2951ACSDX-3.3/NOPB WSON NGT 8 4500 367.0 367.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 18-May-2018
Pack Materials-Page 3
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LP2951ACSDX/NOPB WSON NGT 8 4500 367.0 367.0 35.0
LP2951CMM VSSOP DGK 8 1000 210.0 185.0 35.0
LP2951CMM-3.0/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0
LP2951CMM-3.3/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0
LP2951CMM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0
LP2951CMMX VSSOP DGK 8 3500 367.0 367.0 35.0
LP2951CMMX-3.0/NOPB VSSOP DGK 8 3500 367.0 367.0 35.0
LP2951CMMX-3.3/NOPB VSSOP DGK 8 3500 367.0 367.0 35.0
LP2951CMMX/NOPB VSSOP DGK 8 3500 367.0 367.0 35.0
LP2951CMX SOIC D 8 2500 367.0 367.0 35.0
LP2951CMX-3.0/NOPB SOIC D 8 2500 367.0 367.0 35.0
LP2951CMX-3.3/NOPB SOIC D 8 2500 367.0 367.0 35.0
LP2951CMX/NOPB SOIC D 8 2500 367.0 367.0 35.0
LP2951CSD-3.0/NOPB WSON NGT 8 1000 203.0 203.0 35.0
LP2951CSD-3.3/NOPB WSON NGT 8 1000 210.0 185.0 35.0
LP2951CSD/NOPB WSON NGT 8 1000 203.0 203.0 35.0
LP2951CSDX-3.3/NOPB WSON NGT 8 4500 367.0 367.0 35.0
LP2951CSDX/NOPB WSON NGT 8 4500 346.0 346.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 18-May-2018
Pack Materials-Page 4
MECHANICAL DATA
NGT0008A
www.ti.com
SDC08A (Rev A)
www.ti.com
PACKAGE OUTLINE
C
10.42
9.40
6.73
6.35
6.22
5.97 1.27
0.88
5.46
4.96
2.285
4.57
1.02
0.64
3X 0.88
0.64
2.55 MAX
0.88
0.46
8
8
1.14
0.89
0.60
0.46
0.17
0.51 MIN
4.32 MIN
(2.345)
(2.5)
TO-252 - 2.55 mm max heightNDP0003B
TRANSISTOR OUTLINE
4219870/A 03/2018
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Reference JEDEC registration TO-252.
0.25 C A B
TOP & BOTTOM
PKG
1
2
3
OPTIONAL
SEATING PLANE
4
3
2
1
SCALE 1.500
A
B
www.ti.com
EXAMPLE BOARD LAYOUT
0.07 MAX
ALL AROUND 0.07 MIN
ALL AROUND
(4.57)
2X (1.3) 2X (2.15) (5.7)
(5.5)
(2.285)(4.38)
(R0.05) TYP
TO-252 - 2.55 mm max heightNDP0003B
TRANSISTOR OUTLINE
4219870/A 03/2018
NOTES: (continued)
4. This package is designed to be soldered to a thermal pad on the board. For more information, see Texas Instruments literature numbers
SLMA002(www.ti.com/lit/slm002) and SLMA004 (www.ti.com/lit/slma004).
5. Vias are optional depending on application, refer to device data sheet. It is recommended that vias under paste be filled, plugged or tented.
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE: 8X
SYMM
PKG
1
3
4
SEE SOLDER MASK
DETAIL
EXPOSED
METAL
METAL EDGE
SOLDER MASK
OPENING
NON SOLDER MASK
DEFINED
(PREFERRED) SOLDER MASK DETAIL
EXPOSED
METAL
METAL UNDER
SOLDER MASK
SOLDER MASK
OPENING
SOLDER MASK DEFINED
www.ti.com
EXAMPLE STENCIL DESIGN
2X (2.15)
2X (1.3)
(4.57)
(4.38)
(1.32) TYP
(1.35) TYP
(0.26) (R0.05) TYP
16X (1.12)
16X (1.15)
TO-252 - 2.55 mm max heightNDP0003B
TRANSISTOR OUTLINE
4219870/A 03/2018
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
7. Board assembly site may have different recommendations for stencil design.
PKG
SOLDER PASTE EXAMPLE
BASED ON 0.125 MM THICK STENCIL
SCALE: 8X
www.ti.com
PACKAGE OUTLINE
3X 2.67
2.03
5.21
4.44
5.34
4.32
3X
12.7 MIN
2X 1.27 0.13
3X 0.55
0.38
4.19
3.17
3.43 MIN
3X 0.43
0.35
(2.54)
NOTE 3
2X
2.6 0.2
2X
4 MAX
SEATING
PLANE
6X
0.076 MAX
(0.51) TYP
(1.5) TYP
TO-92 - 5.34 mm max heightLP0003A
TO-92
4215214/B 04/2017
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Lead dimensions are not controlled within this area.
4. Reference JEDEC TO-226, variation AA.
5. Shipping method:
a. Straight lead option available in bulk pack only.
b. Formed lead option available in tape and reel or ammo pack.
c. Specific products can be offered in limited combinations of shipping medium and lead options.
d. Consult product folder for more information on available options.
EJECTOR PIN
OPTIONAL
PLANE
SEATING
STRAIGHT LEAD OPTION
321
SCALE 1.200
FORMED LEAD OPTION
OTHER DIMENSIONS IDENTICAL
TO STRAIGHT LEAD OPTION
SCALE 1.200
www.ti.com
EXAMPLE BOARD LAYOUT
0.05 MAX
ALL AROUND
TYP
(1.07)
(1.5) 2X (1.5)
2X (1.07)
(1.27)
(2.54)
FULL R
TYP
( 1.4)0.05 MAX
ALL AROUND
TYP
(2.6)
(5.2)
(R0.05) TYP
3X ( 0.9) HOLE
2X ( 1.4)
METAL
3X ( 0.85) HOLE
(R0.05) TYP
4215214/B 04/2017
TO-92 - 5.34 mm max heightLP0003A
TO-92
LAND PATTERN EXAMPLE
FORMED LEAD OPTION
NON-SOLDER MASK DEFINED
SCALE:15X
SOLDER MASK
OPENING
METAL
2X
SOLDER MASK
OPENING
123
LAND PATTERN EXAMPLE
STRAIGHT LEAD OPTION
NON-SOLDER MASK DEFINED
SCALE:15X
METAL
TYP
SOLDER MASK
OPENING
2X
SOLDER MASK
OPENING
2X
METAL
12 3
www.ti.com
TAPE SPECIFICATIONS
19.0
17.5
13.7
11.7
11.0
8.5
0.5 MIN
TYP-4.33.7
9.75
8.50
TYP
2.9
2.4 6.75
5.95
13.0
12.4
(2.5) TYP
16.5
15.5
32
23
4215214/B 04/2017
TO-92 - 5.34 mm max heightLP0003A
TO-92
FOR FORMED LEAD OPTION PACKAGE
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Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Texas Instruments:
LP2951ACM LP2951ACM-3.0/NOPB LP2951ACM-3.3 LP2951ACM-3.3/NOPB LP2951ACM/NOPB LP2951ACMM
LP2951ACMM-3.0 LP2951ACMM-3.0/NOPB LP2951ACMM-3.3 LP2951ACMM-3.3/NOPB LP2951ACMM/NOPB
LP2951ACMMX-3.0 LP2951ACMMX-3.0/NOPB LP2951ACMMX-3.3/NOPB LP2951ACMMX/NOPB LP2951ACMX
LP2951ACMX-3.0/NOPB LP2951ACMX-3.3/NOPB LP2951ACMX/NOPB LP2951ACN/NOPB LP2951ACSD
LP2951ACSD/NOPB LP2951ACSDX-3.3/NOPB LP2951ACSDX/NOPB LP2951CM LP2951CM-3.0/NOPB
LP2951CM-3.3 LP2951CM-3.3/NOPB LP2951CM/NOPB LP2951CMM LP2951CMM-3.0/NOPB LP2951CMM-
3.3/NOPB LP2951CMM/NOPB LP2951CMMX LP2951CMMX-3.0/NOPB LP2951CMMX-3.3 LP2951CMMX-
3.3/NOPB LP2951CMMX/NOPB LP2951CMX LP2951CMX-3.0/NOPB LP2951CMX-3.3 LP2951CMX-3.3/NOPB
LP2951CMX/NOPB LP2951CN/NOPB LP2951CSD-3.0/NOPB LP2951CSD-3.3/NOPB LP2951CSD/NOPB
LP2951CSDX-3.0/NOPB LP2951CSDX-3.3/NOPB LP2951CSDX/NOPB