LM4041AIM3-1.2 - MAXIM INTEGRATED PRODUCTS

LM4041

LM4041 Precision Micropower Shunt Voltage Reference

Literature Number: SNOS641D

LM4041

Precision Micropower Shunt Voltage Reference

General Description

Ideal for space critical applications, the LM4041 precision

voltage reference is available in the sub-miniature SC70 and

SOT-23 surface-mount packages. The LM4041’s advanced

design eliminates the need for an external stabilizing capaci-

tor while ensuring stability with any capacitive load, thus

making the LM4041 easy to use. Further reducing design

effort is the availability of a fixed (1.225V) and adjustable

reverse breakdown voltage. The minimum operating current

is 60 µA for the LM4041-1.2 and the LM4041-ADJ. Both

versions have a maximum operating current of 12 mA.

The LM4041 utilizes fuse and zener-zap reverse breakdown

or reference voltage trim during wafer sort to ensure that the

prime parts have an accuracy of better than ±0.1%

(A grade) at 25˚C. Bandgap reference temperature drift cur-

vature correction and low dynamic impedance ensure stable

reverse breakdown voltage accuracy over a wide range of

operating temperatures and currents.

Features

nSmall packages: SOT-23, TO-92, and SC70

nNo output capacitor required

nTolerates capacitive loads

nReverse breakdown voltage options of 1.225V and

adjustable

Key Specifications (LM4041-1.2)

jOutput voltage tolerance

(A grade, 25˚C) ±0.1%(max)

jLow output noise

(10 Hz to 10kHz) 20µV

rms

jWide operating current range 60µA to 12mA

jIndustrial temperature range −40˚C to +85˚C

jExtended temperature range −40˚C to +125˚C

jLow temperature coefficient 100 ppm/˚C (max)

Applications

nPortable, Battery-Powered Equipment

nData Acquisition Systems

nInstrumentation

nProcess Control

nEnergy Management

nAutomotive

nPrecision Audio Components

Connection Diagrams

SOT-23

01139201

*This pin must be left floating or connected to pin 2.

01139240

Top View

See NS Package Number MF03A

(JEDEC Registration TO-236AB)

SC-70

01139246

*This pin must be left floating or connected to pin 1.

01139247

Top View

See NS Package Number MAA05A

March 2005

LM4041 Precision Micropower Shunt Voltage Reference

Connection Diagrams (Continued)

TO-92

01139203 01139232

Bottom View

See NS Package Number Z03A

Ordering Information

Reverse

Breakdown

Voltage

Tolerance at 25˚C

and Average

Reverse

Breakdown

Voltage

Temperature

Coefficient

Package

Number

M3 (SOT-23) M7 (SC70) Z (TO-92)

Supplied as 1000

Units Tape and

Reel

Supplied as 3000

Units Tape and

Reel

Supplied as 1000

Units Tape and

Reel

Supplied as 3000

Units Tape and

Reel

±0.1%, 100

ppm/˚C max (A

grade)

LM4041AIM3-1.2 LM4041AIM3X-1.2 LM4041AIZ-1.2 MF03A,

Z03A

±0.2%, 100

ppm/˚C max (B

grade)

LM4041BIM3-1.2 LM4041BIM3X-1.2 LM4041BIM7-1.2 LM4041BIM7X-1.2 LM4041BIZ-1.2 MF03A,

Z03A,

MAA05A

±0.5%, 100

ppm/˚C max (C

grade)

LM4041CEM3-1.2

LM4041CIM3-1.2

LM4041CEM3-ADJ

LM4041CIM3-ADJ

LM4041CEM3X-1.2

LM4041CIM3X-1.2

LM4041CEM3X-ADJ

LM4041CIM3X-ADJ

LM4041CIM7-1.2

LM4041CIM7-ADJ

LM4041CIM7X-1.2

LM4041CIM7X-ADJ

LM4041CIZ-1.2

LM4041CIZ-ADJ

MF03A,

Z03A,

MAA05A

±1.0%, 150

ppm/˚C max (D

grade)

LM4041DEM3-1.2

LM4041DIM3-1.2

LM4041DEM3-ADJ

LM4041DIM3-ADJ

LM4041DEM3X-1.2

LM4041DIM3X-1.2

LM4041DEM3X-ADJ

LM4041DIM3X-ADJ

LM4041DIM7-1.2

LM4041DIM7-ADJ

LM4041DIM7X-1.2

LM4041DIM7X-ADJ

LM4041DIZ-1.2

LM4041DIZ-ADJ

MF03A,

Z03A,

MAA05A

±2.0%, 150

ppm/˚C max (E

grade)

LM4041EEM3-1.2

LM4041EIM3-1.2

LM4041EEM3X-1.2

LM4041EIM3X-1.2

LM4041EIM7-1.2 LM4041EIM7X-1.2 LM4041EIZ-1.2 MF03A,

Z03A,

MAA05A

LM4041

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SOT-23 and SC70 Package Marking Information

Only three fields of marking are possible on the SOT-23’s and SC70’s small surface. This table gives the meaning of the three

fields.

Part Marking Field Definition

R1A (SOT-23 Only) First Field:

R1B R = Reference

R1C Second Field:

R1D 1 = 1.225V Voltage Option

R1E A = Adjustable

Third Field:

RAC A–E = Initial Reverse Breakdown

RAD Voltage or Reference Voltage Tolerance

A=±0.1%, B = ±0.2%, C = ±0.5%, D = ±1.0%, E = ±2.0%

LM4041

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Reverse Current 20 mA

Forward Current 10 mA

Maximum Output Voltage

(LM4041-ADJ) 15V

Power Dissipation (T

= 25˚C) (Note 2)

M3 Package 306 mW

Z Package 550 mW

M7 Package 241mW

Storage Temperature −65˚C to +150˚C

Lead Temperature

M3 Packages

Vapor phase (60 seconds) +215˚C

Infrared (15 seconds) +220˚C

Z Package

Soldering (10 seconds) +260˚C

ESD Susceptibility

Human Body Model (Note 3) 2 kV

Machine Model (Note 3) 200V

See AN-450 “Surface Mounting Methods and Their Effect

on Product Reliability” for other methods of soldering

surface mount devices.

Operating Ratings(Notes 1, 2)

Temperature Range (T

min

≤T

max

)

Industrial Temperature Range −40˚C ≤T

≤+85˚C

Extended Temperature Range −40˚C ≤T

≤+125˚C

Reverse Current

LM4041-1.2 60 µA to 12 mA

LM4041-ADJ 60 µA to 12 mA

Output Voltage Range

LM4041-ADJ 1.24V to 10V

LM4041-1.2

Electrical Characteristics (Industrial Temperature Range)

Boldface limits apply for T

MIN

to T

MAX

;all other limits T

= 25˚C. The grades A and B designate initial Re-

verse Breakdown Voltage tolerances of ±0.1% and ±0.2%, respectively.

Symbol Parameter Conditions Typical

(Note 4)

LM4041AIM3

LM4041AIZ

Limits

(Note 5)

LM4041BIM3

LM4041BIZ

LM4041BIM7

Limits

(Note 5)

Units

(Limit)

Reverse Breakdown Voltage I

= 100 µA 1.225 V

Reverse Breakdown Voltage I

= 100 µA ±1.2 ±2.4 mV (max)

Tolerance (Note 6) ±9.2 ±10.4 mV (max)

RMIN

Minimum Operating Current 45 µA

60 60 µA (max)

65 65 µA (max)

∆V

/∆T Average Reverse Breakdown

Voltage Temperature

Coefficient (Note 6)

=10mA ±20 ppm/˚C

=1mA ±15 ±100 ±100 ppm/˚C (max)

= 100 µA ±15 ppm/˚C

∆V

/∆I

Reverse Breakdown Voltage

Change with Operating

Current Change

(Note 9)

RMIN

≤I

≤1 mA 0.7 mV

1.5 1.5 mV (max)

2.0 2.0 mV (max)

1mA≤I

≤12 mA 4.0 mV

6.0 6.0 mV (max)

8.0 8.0 mV (max)

Reverse Dynamic Impedance I

= 1 mA, f = 120 Hz, 0.5 Ω

= 0.1 I

1.5 1.5 Ω(max)

Wideband Noise I

= 100 µA 20 µV

rms

10 Hz ≤f≤10 kHz

∆V

Reverse Breakdown Voltage

Long Term Stability

t = 1000 hrs

T = 25˚C ±0.1˚C 120 ppm

= 100 µA

HYST

Thermal Hysteresis

(Note 10)

∆T = −40˚C to +125˚C 0.08 %

LM4041

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LM4041-1.2

Electrical Characteristics (Industrial Temperature Range) (Continued)

LM4041-1.2

Electrical Characteristics (Industrial Temperature Range)

Boldface limits apply for T

MIN

to T

MAX

;all other limits T

= 25˚C. The grades C, D and E designate initial Re-

verse Breakdown Voltage tolerances of ±0.5%, ±1.0% and ±2.0%, respectively.

Symbol Parameter Conditions Typical

(Note 4)

LM4041CIM3

LM4041CIZ

LM4041CIM7

Limits

(Note 5)

LM4041DIM3

LM4041DIZ

LM4041DIM7

Limits (Note

LM4041EIM3

LM4041EIZ

LM4041EIM7

Limits

(Note 5)

Units

(Limit)

Reverse Breakdown

Voltage

= 100 µA 1.225 V

Reverse Breakdown

Voltage

= 100 µA ±6±12 ±25 mV (max)

Tolerance (Note 6) ±14 ±24 ±36 mV (max)

RMIN

Minimum Operating

Current

45 µA

60 65 65 µA (max)

65 70 70 µA (max)

∆V

/∆TV

Temperature

Coefficient (Note 6)

=10mA ±20 ppm/˚C

=1mA ±15 ±100 ±150 ±150 ppm/˚C (max)

= 100 µA ±15 ppm/˚C

∆V

/∆I

Reverse Breakdown

Voltage Change with

Operating Current

Change

(Note 9)

RMIN

≤I

≤1 mA 0.7 mV

1.5 2.0 2.0 mV (max)

2.0 2.5 2.5 mV (max)

1mA≤I

≤12 mA 2.5 mV

6.0 8.0 8.0 mV (max)

8.0 10.0 10.0 mV (max)

Reverse Dynamic

Impedance

= 1 mA, f = 120 Hz 0.5 Ω

= 0.1 I

1.5 2.0 2.0 Ω(max)

Wideband Noise I

= 100 µA 20 µV

rms

10 Hz ≤f≤10 kHz

∆V

Reverse Breakdown

Voltage Long Term

Stability

t = 1000 hrs

T = 25˚C ±0.1˚C 120 ppm

= 100 µA

HYST

Thermal Hysteresis

(Note 10)

∆T = −40˚C to +125˚C 0.08 %

LM4041

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LM4041-1.2

Electrical Characteristics (Extended Temperature Range)

Boldface limits apply for T

MIN

to T

MAX

;all other limits T

= 25˚C. The grades C, D and E designate initial Re-

verse Breakdown Voltage tolerance of ±0.5%, ±1.0% and ±2.0% respectively.

Symbol Parameter Conditions Typical

(Note 4)

LM4041CEM3

Limits

(Note 5)

LM4041DEM3

Limits

(Note 5)

LM4041EEM3

Limits

(Note 5)

Units

(Limit)

Reverse Breakdown

Voltage

= 100 µA 1.225 V

Reverse Breakdown

Voltage Error

= 100 µA ±6±12 ±25 mV (max)

(Note 6) ±18.4 ±31 ±43 mV (max)

RMIN

Minimum Operating

Current

45 µA

60 65 65 µA (max)

68 73 73 µA (max)

∆V

/∆T VR Temperature

Coefficient(Note 6)

=10mA ±20 ppm/˚C

=1mA ±15 ±100 ±150 ±150 ppm/˚C

(max)

= 100 µA ±15 ppm/˚C

∆V

/∆I

Reverse Breakdown

Change with

Current

(Note 9)

RMIN

≤I

≤1.0 mA 0.7 mV

1.5 2.0 2.0 mV (max)

2.0 2.5 2.5 mV (max)

1mA≤I

≤12 mA 2.5 mV

6.0 8.0 8.0 mV (max)

8.0 10.0 10.0 mV (max)

Reverse Dynamic

Impedance

= 1 mA, f = 120 Hz, 0.5 Ω

= 0.1 I

1.5 2.0 2.0 Ω(max)

Noise Voltage I

= 100 µA 20 µV

rms

10 Hz ≤f≤10 kHz

∆V

Long Term Stability

(Non-Cumulative)

t = 1000 hrs

T = 25˚C ±0.1˚C 120 ppm

= 100 µA

HYST

Thermal Hysteresis

(Note 10)

∆T = −40˚C to +125˚C 0.08 %

LM4041

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LM4041-ADJ (Adjustable)

Electrical Characteristics (Industrial Temperature Range)

Boldface limits apply for T

MIN

to T

MAX

;all other limits T

= 25˚C unless otherwise specified (SOT-23, see (Note

7)), I

RMIN

≤I

≤12 mA, V

REF

≤V

OUT

≤10V. The grades C and D designate initial Reference Voltage Tolerances of ±0.5%

and ±1%, respectively for V

OUT

= 5V.

Symbol Parameter Conditions Typical

(Note 4)

LM4041CIM3

LM4041CIZ

LM4041CIM7

(Note 5)

LM4041DIM3

LM4041DIZ

LM4041DIM7

(Note 5)

Units

(Limit)

REF

Reference Voltage I

= 100 µA, V

OUT

= 5V 1.233 V

Reference Voltage I

= 100 µA, V

OUT

=5V ±6.2 ±12 mV (max)

Tolerance (Note 8) ±14 ±24 mV (max)

RMIN

Minimum Operating

Current

45 µA

60 65 µA (max)

65 70 µA (max)

∆V

REF

/∆I

Reference Voltage

Change with Operating

Current Change

(Note 9)

RMIN

≤I

≤1 mA 0.7 mV

SOT-23: V

OUT

≥1.6V 1.5 2.0 mV (max)

(Note 7) 2.0 2.5 mV (max)

1mA≤I

≤12 mA 2 mV

SOT-23: V

OUT

≥1.6V (Note 7) 4 6 mV (max)

68mV (max)

∆V

REF

/∆V

Reference Voltage

Change

with Output Voltage

Change

= 1 mA −1.55 mV/V

−2.0 −2.5 mV/V (max)

−2.5 −3.0 mV/V (max)

Feedback Current 60 nA

100 150 nA (max)

120 200 nA (max)

∆V

REF

/∆T Average Reference

Voltage Temperature

Coefficient (Note 8)

OUT

= 5V, I

= 10 mA 20 ppm/˚C

= 1 mA 15 ±100 ±150 ppm/˚C (max)

= 100 µA 15 ppm/˚C

OUT

Dynamic Output

Impedance

= 1 mA, f = 120 Hz,

= 0.1 I

OUT

REF

0.3 Ω

OUT

= 10V 2 Ω

Wideband Noise I

= 100 µA V

OUT

REF

20 µV

rms

10 Hz ≤f≤10 kHz

∆V

REF

Reference Voltage Long t = 1000 hrs, I

= 100 µA 120 ppm

Term Stability T = 25˚C ±0.1˚C

HYST

Thermal Hysteresis

(Note 10)

∆T = −40˚C to +125˚C 0.08 %

LM4041

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LM4041-ADJ (Adjustable)

Electrical Characteristics (Extended Temperature Range)

Boldface limits apply for T

MIN

to T

MAX

;all other limits T

= 25˚C unless otherwise specified (SOT-23, see (Note

7)), I

RMIN

≤I

≤12 mA, V

REF

≤V

OUT

≤10V. The grades C and D designate initial Reference Voltage Tolerances of ±0.5%

and ±1%, respectively for V

OUT

= 5V.

Symbol Parameter Conditions Typical

(Note 4)

LM4041CEM3

(Note 5)

LM4041DEM3

(Note 5)

Units

(Limit)

REF

Reference Voltage I

= 100 µA, V

OUT

= 5V 1.233 V

Reference Voltage I

= 100 µA, V

OUT

=5V ±6.2 ±12 mV (max)

Tolerance (Note 8) ±18 ±30 mV (max)

RMIN

Minimum Operating

Current

45 µA

60 65 µA (max)

68 73 µA (max)

∆V

REF

/∆I

Reference Voltage

Change with Operating

Current Change

(Note 9)

RMIN

≤I

≤1 mA 0.7 mV

SOT-23: V

OUT

≥1.6V 1.5 2.0 mV (max)

(Note 7) 2.0 2.5 mV (max)

1mA≤I

≤12 mA 2 mV

SOT-23: V

OUT

≥1.6V(Note 7) 8 10 mV (max)

68mV (max)

∆V

REF

/∆V

Reference Voltage

Change

with Output Voltage

Change

= 1 mA −1.55 mV/V

−2.0 −2.5 mV/V (max)

−3.0 −4.0 mV/V (max)

Feedback Current 60 nA

100 150 nA (max)

120 200 nA (max)

∆V

REF

/∆T Average Reference

Voltage Temperature

Coefficient (Note 8)

OUT

= 5V, I

= 10 mA 20 ppm/˚C

= 1 mA 15 ±100 ±150 ppm/˚C (max)

= 100 µA 15 ppm/˚C

OUT

Dynamic Output

Impedance

= 1 mA, f = 120 Hz,

= 0.1 I

OUT

REF

0.3 Ω

OUT

= 10V 2 Ω

Wideband Noise I

= 100 µA V

OUT

REF

20 µV

rms

10 Hz ≤f≤10 kHz

∆V

REF

Reference Voltage Long t = 1000 hrs, I

= 100 µA 120 ppm

Term Stability T = 25˚C ±0.1˚C

HYST

Thermal Hysteresis

(Note 10)

∆T = −40˚C to +125˚C 0.08 %

LM4041

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LM4041-ADJ (Adjustable)

Electrical Characteristics (Extended Temperature Range) (Continued)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed

specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test

conditions.

Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to

ambient thermal resistance), and TA(ambient temperature). The maximum allowable power dissipation at any temperature is PDmax =(T

Jmax −T

A)/θJA or the

number given in the Absolute Maximum Ratings, whichever is lower. For the LM4041, TJmax = 125˚C, and the typical thermal resistance (θJA), when board mounted,

is 326˚C/W for the SOT-23 package, 415˚C/W for the SC70 package and 180˚C/W with 0.4" lead length and 170˚C/W with 0.125" lead length for the TO-92 package.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩresistor into each pin. The machine model is a 200 pF capacitor discharged

directly into each pin. All pins are rated at 2kV for Human Body Model, but the feedback pin which is rated at 1kV.

Note 4: Typicals are at TJ= 25˚C and represent most likely parametric norm.

Note 5: Limits are 100% production tested at 25˚C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQC) methods.

The limits are used to calculate National’s AOQL.

Note 6: The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance

±[(∆VRv∆T)(max ∆T)(VR)]. Where, ∆VR/∆T is the VRtemperature coefficient, max∆T is the maximum difference in temperature from the reference point of 25 ˚C

to T MAX or TMIN, and VRis the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature range where

max∆T=65˚C is shown below:

A-grade: ±0.75% = ±0.1% ±100 ppm/˚C x 65˚C

B-grade: ±0.85% = ±0.2% ±100 ppm/˚C x 65˚C

C-grade: ±1.15% = ±0.5% ±100 ppm/˚C x 65˚C

D-grade: ±1.98% = ±1.0% ±150 ppm/˚C x 65˚C

E-grade: ±2.98% = ±2.0% ±150 ppm/˚C x 65˚C

The total over-temperature tolerance for the different grades in the extended temperature range where max ∆T = 100 ˚C is shown below:

B-grade: ±1.2% = ±0.2% ±100 ppm/˚C x 100˚C

C-grade: ±1.5% = ±0.5% ±100 ppm/˚C x 100˚C

D-grade: ±2.5% = ±1.0% ±150 ppm/˚C x 100˚C

E-grade: ±4.5% = ±2.0% ±150 ppm/˚C x 100˚C

Therefore, as an example, the A-grade LM4041-1.2 has an over-temperature Reverse Breakdown Voltage tolerance of ±1.2V x 0.75% = ±9.2 mV.

Note 7: When VOUT ≤1.6V, the LM4041-ADJ in the SOT-23 package must operate at reduced IR. This is caused by the series resistance of the die attach between

the die (-) output and the package (-) output pin. See the Output Saturation (SOT-23 only) curve in the Typical Performance Characteristics section.

Note 8: Reference voltage and temperature coefficient will change with output voltage. See Typical Performance Characteristics curves.

Note 9: Load regulation is measured on pulse basis from no load to the specified load current. Ouput changes due to die temperature change must be taken into

account separately.-

Note 10: Thermal hysteresis is defined as the difference in voltage measured at +25˚C after cycling to temperature -40˚C and the 25˚C measurement after cycling

to temperature +125˚C.

LM4041

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Typical Performance Characteristics

Temperature Drift for Different

Average Temperature Coefficient

Output Impedance vs Frequency

01139219 01139204

Noise Voltage Reverse Characteristics and

Minimum Operating Current

01139205 01139209

Start-Up

Characteristics

01139207

01139208

LM4041

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Typical Performance Characteristics (Continued)

Reference Voltage vs Output

Voltage and Temperature

Reference Voltage vs Temperature

and Output Voltage

01139211 01139210

Feedback Current vs Output

Voltage and Temperature

Output Saturation

(SOT-23 Only)

01139212 01139233

Output Impedance vs Frequency Output Impedance vs Frequency

01139213 01139214

LM4041

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Typical Performance Characteristics (Continued)

Reverse Characteristics

01139215

01139216

Large Signal Response

01139217

01139218

Functional Block Diagram

01139221

*LM4041-ADJ only

**LM4041-1.2 only

LM4041

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Applications Information

The LM4041 is a precision micro-power curvature-corrected

bandgap shunt voltage reference. For space critical applica-

tions, the LM4041 is available in the sub-miniature SOT-23

and SC70 surface-mount package. The LM4041 has been

designed for stable operation without the need of an external

capacitor connected between the “+” pin and the “−” pin. If,

however, a bypass capacitor is used, the LM4041 remains

stable. Design effort is further reduced with the choice of

either a fixed 1.2V or an adjustable reverse breakdown

voltage. The minimum operating current is 60 µA for the

LM4041-1.2 and the LM4041-ADJ. Both versions have a

maximum operating current of 12 mA.

LM4041s using the SOT-23 package have pin 3 connected

as the (-) output through the package’s die attach interface.

Therefore, the LM4041-1.2’s pin 3 must be left floating or

connected to pin 2 and the LM4041-ADJ’s pin 3 is the (-)

output.

LM4041s using the SC70 package have pin 2 connected as

the (−) output through the packages’ die attach interface.

Therefore, the LM4041-1.2’s pin 2 must be left floating or

connected to pin 1, and the LM4041-ADJ’s pin 2 is the (−)

output.

The typical thermal hysteresis specification is defined as the

change in +25˚C voltage measured after thermal cycling.

The device is thermal cycled to temperature -40˚C and then

measured at 25˚C. Next the device is thermal cycled to

temperature +125˚C and again measured at 25˚C. The re-

sulting V

OUT

delta shift between the 25˚C measurements is

thermal hysteresis. Thermal hysteresis is common in preci-

sion references and is induced by thermal-mechanical pack-

age stress. Changes in environmental storage temperature,

operating temperature and board mounting temperature are

all factors that can contribute to thermal hysteresis.

In a conventional shunt regulator application (Figure 1), an

external series resistor (R

) is connected between the sup-

ply voltage and the LM4041. R

determines the current that

flows through the load (I

) and the LM4041 (I

). Since load

current and supply voltage may vary, R

should be small

enough to supply at least the minimum acceptable I

to the

LM4041 even when the supply voltage is at its minimum and

the load current is at its maximum value. When the supply

voltage is at its maximum and I

is at its minimum, R

should

be large enough so that the current flowing through the

LM4041 is less than 12 mA.

should be selected based on the supply voltage, (V

), the

desired load and operating current, (I

and I

), and the

LM4041’s reverse breakdown voltage, V

The LM4041-ADJ’s output voltage can be adjusted to any

value in the range of 1.24V through 10V. It is a function of the

internal reference voltage (V

REF

) and the ratio of the external

feedback resistors as shown in Figure 2 . The output voltage

is found using the equation

REF

[(R2/R1) + 1] (1)

where V

is the output voltage. The actual value of the

internal V

REF

is a function of V

. The “corrected” V

REF

determined by

REF

=∆V

(∆V

REF

/∆V

)+V

(2)

where

= 1.240 V

and

∆V

=(V

−V

)

∆V

REF

/∆V

is found in the Electrical Characteristics and is

typically −1.55 mV/V. You can get a more accurate indication

of the output voltage by replacing the value of V

REF

equation (1) with the value found using equation (2).

Note that the actual output voltage can deviate from that

predicted using the typical value of ∆V

REF

/∆V

in equation

(2): for C-grade parts, the worst-case ∆V

REF

/∆V

is −2.5

mV/V. For D-grade parts, the worst-case ∆V

REF

/∆V

is −3.0

mV/V.

Typical Applications

01139222

FIGURE 1. Shunt Regulator

01139234

REF

[(R2/R1) + 1]

FIGURE 2. Adjustable Shunt Regulator

LM4041

www.national.com13

Typical Applications (Continued)

01139224

FIGURE 3. Bounded amplifier reduces saturation-induced delays and can prevent succeeding stage damage.

Nominal clamping voltage is ±V

(LM4041’s reverse breakdown voltage) +2 diode V

01139220

FIGURE 4. Voltage Level Detector

01139223

FIGURE 5. Voltage Level Detector

LM4041

www.national.com 14

Typical Applications (Continued)

01139225

FIGURE 6. Fast Positive Clamp

2.4V + V

01139226

FIGURE 7. Bidirectional Clamp ±2.4V

01139235

FIGURE 8. Bidirectional Adjustable

Clamp ±18V to ±2.4V

01139236

FIGURE 9. Bidirectional Adjustable

Clamp ±2.4V to ±6V

LM4041

www.national.com15

Typical Applications (Continued)

Note 11: *D1 can be any LED, VF= 1.5V to 2.2V at 3 mA. D1 may act as an

indicator. D1 will be on if ITHRESHOLDfalls below the threshold current, except

withI=0.

01139237

FIGURE 10. Simple Floating Current Detector

01139238

FIGURE 11. Current Source

LM4041

www.national.com 16

Typical Applications (Continued)

01139239

FIGURE 12. Precision Floating Current Detector

01139228

01139229

FIGURE 13. Precision 1 µA to 1 mA Current Sources

LM4041

www.national.com17

Physical Dimensions inches (millimeters)

unless otherwise noted

Plastic Surface Mount Package (M3)

NS Package Number MF03A

(JEDEC Registration TO-236AB)

Molded Package (SC70)

NS Package Number MAA05A

LM4041

www.national.com 18

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

Plastic Package (Z)

NS Package Number Z03A

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves

the right at any time without notice to change said circuitry and specifications.

For the most current product information visit us at www.national.com.

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS

WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR

CORPORATION. As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body, or

(b) support or sustain life, and whose failure to perform when

properly used in accordance with instructions for use

provided in the labeling, can be reasonably expected to result

in a significant injury to the user.

2. A critical component is any component of a life support

device or system whose failure to perform can be reasonably

expected to cause the failure of the life support device or

system, or to affect its safety or effectiveness.

BANNED SUBSTANCE COMPLIANCE

National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products

Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain

no ‘‘Banned Substances’’ as defined in CSP-9-111S2.

National Semiconductor

Americas Customer

Support Center

Email: new.feedback@nsc.com

Tel: 1-800-272-9959

National Semiconductor

Europe Customer Support Center

Fax: +49 (0) 180-530 85 86

Email: europe.support@nsc.com

Deutsch Tel: +49 (0) 69 9508 6208

English Tel: +44 (0) 870 24 0 2171

Français Tel: +33 (0) 1 41 91 8790

National Semiconductor

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Support Center

Email: ap.support@nsc.com

National Semiconductor

Japan Customer Support Center

Fax: 81-3-5639-7507

Email: jpn.feedback@nsc.com

Tel: 81-3-5639-7560

www.national.com

LM4041 Precision Micropower Shunt Voltage Reference

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