NCP566ST18T3G - ON SEMICONDUCTOR - Datasheet.Technology

March, 2007 − Rev. 1 1Publication Order Number:

NCP566/D

NCP566

1.5 A Low Dropout

Linear Regulator

The NCP566 low dropout linear regulator will provide 1.5 A at a

fixed output voltage. The fast loop response and low dropout voltage

make this regulator ideal for applications where low voltage and good

load transient response are important. Device protection includes

current limit, short circuit protection, and thermal shutdown.

Features

•Ultra Fast Transient Response (t1.0 ms)

•Low Ground Current (1.5 mA @ Iout = 1.5 A)

•Low Dropout Voltage (0.9 V @ Iout = 1.5 A)

•Low Noise (37 mVrms)

•1.2 V, 1.8 V, 2.5 V Fixed Output Versions.

Other Fixed Voltages Available on Request

•Current Limit Protection

•Thermal Shutdown Protection

•These are Pb−Free Devices

Typical Applications

•Servers

•ASIC Power Supplies

•Post Regulation for Power Supplies

•Constant Current Source

•DTV

•LCD Monitors

•Networking Equipment

•Battery Powered Systems

•Motherboards

•Peripheral Cards

•Set Top Boxes

•Medical Equipment

•Notebook Computers

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See detailed ordering and shipping information in the package

dimensions section on page 9 of this data sheet.

ORDERING INFORMATION

MARKING

DIAGRAMS

xx = Voltage Rating

12 = 1.2 V

18 = 1.8 V

25 = 2.5 V

A = Assembly Location

Y = Year

M = Date Code

G= Pb−Free Package

AYM

566xx G

SOT−223

CASE 318E

(Note: Microdot may be in either location)

Vin

GND

Vout

GND

PIN CONNECTIONS

NCP566

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PIN DESCRIPTION

Pin No. Symbol Description

ÁÁÁÁÁÁÁÁÁ

Vin

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Positive Power Supply Input Voltage

ÁÁÁÁÁÁÁÁÁ

2, Tab

ÁÁÁÁÁÁÁÁÁ

Ground

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Power Supply Ground

ÁÁÁÁÁÁÁÁÁ

Vout

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Regulated Output Voltage

MAXIMUM RATINGS

Rating Symbol Value Unit

Input Voltage (Note 1) Vin 9.0 V

Output Pin Voltage Vout −0.3 to Vin + 0.3 V

Thermal Characteristics (Notes 2, 3)

Thermal Resistance, Junction−to−Ambient

Thermal Resistance, Junction−to−Pin RqJA

RqJP 107

°C/W

Operating Junction Temperature Range TJ−40 to 150 °C

Operating Ambient Temperature Range TA−40 to 125 °C

Storage Temperature Range Tstg −55 to 150 °C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

1. This device series contains ESD protection and exceeds the following tests:

Human Body Model JESD 22−A114−B

Machine Model JESD 22−A115−A

2. The maximum package power dissipation is:

PD+TJ(max) *TA

RqJA

3. As measured using a copper heat spreading area of 50 mm2, 1 oz copper thickness.

Figure 1. Typical Schematic

Voltage

Reference

Block

Vref = 0.9 V

Output

Stage

Cin

Cout

Vout

GND

Vin

GND

Cin − 4.7 mF to 150 mF recommended

Cout − 2.2 mF to 150 mF recommended

See more details in Applications Information section

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ELECTRICAL CHARACTERISTICS (Vin = Vout + 1.6 V, for typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C,

(Note 4) unless otherwise noted.)

Characteristic Symbol Min Typ Max Unit

Output Voltage (10 mA < Iout < 1.5 A; 2.8 V < Vin < 9.0 V; TJ = −10 to 105°C)

1.2 V version Vout 1.176

(−2%) 1.2 1.224

(+2%) V

Output Voltage (10 mA < Iout < 1.5 A; 2.8 V < Vin < 9.0 V; TJ = −40 to 125°C)

1.2 V version Vout 1.164

(−3%) 1.2 1.236

(+3%) V

Output Voltage (10 mA < Iout < 1.5 A; 3.4 V < Vin < 9.0 V; TJ = −10 to 105°C)

1.8 V version Vout 1.764

(−2%) 1.8 1.836

(+2%) V

Output Voltage (10 mA < Iout < 1.5 A; 3.4 V < Vin < 9.0 V; TJ = −40 to 125°C)

1.8 V version Vout 1.746

(−3%) 1.8 1.854

(+3%) V

Output Voltage (10 mA < Iout < 1.5 A; 4.1 V < Vin < 9.0 V; TJ = −10 to 105°C)

2.5 V version Vout 2.450

(−2%) 2.5 2.550

(+2%) V

Output Voltage (10 mA < Iout < 1.5 A; 4.1 V < Vin < 9.0 V; TJ = −40 to 125°C)

2.5 V version Vout 2.425

(−3%) 2.5 2.575

(+3%) V

Line Regulation (Iout = 10 mA) Regline − 0.02 − %

Load Regulation (10 mA < Iout < 1.5 A) Regload − 0.04 − %

Dropout Voltage (Iout = 1.5 A) (Note 5) Vdo − 0.9 1.3 V

Current Limit Ilim 1.6 3.5 − A

Ripple Rejection (120 Hz; Iout = 1.5 A) RR − 85 − dB

Ripple Rejection (1 kHz; Iout = 1.5 A) RR − 75 − dB

Thermal Shutdown − 160 − °C

Ground Current (Iout = 1.5 A) Iq − 1.5 3.0 mA

Output Noise Voltage (f = 100 Hz to 100 kHz, Iout = 1.5 A) Vn− 37 − mVrms

4. Refer to Application Information section for capacitor details.

5. Dropout voltage is a measurement of the minimum input/output differential at full load.

NCP566

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TYPICAL CHARACTERISTICS

Figure 2. Output Voltage vs. Temperature

2.53

2.52

2.51

2.50

2.49

2.48

2.47

−50 0 50 100 150

TJ, JUNCTION TEMPERATURE (°C)

OUT

, OUTPUT VOLTAGE (V)

−50 0 50 100 15

TJ, JUNCTION TEMPERATURE (°C)

ISC, SHORT CIRCUIT CURRENT LIMIT (A)

3.80

3.75

3.70

3.65

3.60

3.55

3.50

1.2

−50 0 50 100 150

TJ, JUNCTION TEMPERATURE (°C)

Vin − Vout, DROPOUT VOLTAGE (V)

1.0

0.8

0.6

0.4

0.2

Iout = 1.5 A

Iout = 50 mA

−25 25 75 125

Vout = 2.5 V

Iout = 10 mA

Figure 3. Output Voltage vs. Temperature

1.820

1.815

1.810

1.805

1.800

1.795

1.790

1.780

−50 0 50 100 15

TJ, JUNCTION TEMPERATURE (°C)

VOUT, OUTPUT VOLTAGE (V)

−25 25 75 125

Vout = 1.8 V

Iout = 10 mA

Figure 4. Output Voltage vs. Temperature Figure 5. Short Circuit Current Limit

vs. Temperature

Figure 6. Dropout Voltage vs. Temperature

1.785

1.220

1.215

1.210

1.205

1.200

1.195

1.190

1.180

−50 0 50 100 150

TJ, JUNCTION TEMPERATURE (°C)

OUT

, OUTPUT VOLTAGE (V)

−25 25 75 125

Vout = 1.2 V

Iout = 10 mA

1.185

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TYPICAL CHARACTERISTICS

1.70

−50 0 50 100 150

TJ, JUNCTION TEMPERATURE (°C)

IGND, GROUND CURRENT (mA)

1.65

1.60

1.55

1.50

1.45

1.40 −25 25 75 125

Iout = 1.5 A 1.55

1.60

1.65

1.70

1.75

1.80

0 300 600 900 1200 1500

Iout, OUTPUT CURRENT (mA)

IGND, GROUND CURRENT (mA)

Figure 7. Ground Current vs. Temperature Figure 8. Ground Current vs. Output Current

100

010 1000000

RIPPLE REJECTION (dB)

F, FREQUENCY (Hz)

100 1000 10000 100000

Iout = 1.5 A

Figure 9. Ripple Rejection vs. Frequency Figure 10. Output Capacitor ESR Stability vs.

Output Current

2500 750500 1000 15001250

100

1000

OUTPUT CURRENT (mA)

ESR (W)

Stable

Unstable

Vout = 2.5 V

Figure 11. Load Transient from 10 mA to 1.5 A Figure 12. Load Transient from 10 mA to 1.5 A

Vout = 1.2 V Vout = 1.2 V

0.01

0.1

Cout = 10 mF

Cout = 2.2 mF

Cout = 150 mF

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TYPICAL CHARACTERISTICS

140

120

100

NOISE DENSITY (nV/√Hz)

f, FREQUENCY (kHz)

Figure 13. Load Transient from 1.5 A to 10 mA Figure 14. Load Transient from 1.5 A to 10 mA

Vout = 1.2 V

Iout = 10 mA

Figure 15. Noise Density vs. Frequency Figure 16. Noise Density vs. Frequency

Vout = 1.2 V Vout = 1.2 V

1009080706050403020100

140

120

100

NOISE DENSITY (nV/√Hz)

f, FREQUENCY (kHz)

Vout = 1.2 V

Iout = 1.5 A

1009080706050403020100

NCP566

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APPLICATION INFORMATION

The NCP566 low dropout linear regulator provides fixed

voltages at currents up to 1.5 A. It features ultra fast transient

response and low dropout voltage. These devices contain

output current limiting, short circuit protection and thermal

shutdown protection.

Input, Output Capacitor and Stability

Typical values of parameters in Electrical Characteristics

section and in Typical Characteristics section were

measured with input and output capacitors equal to 150 mF

unless otherwise noted.

An input bypass capacitor is recommended to improve

transient response or if the regulator is located more than a

few inches from the power source. This will reduce the

circuit’s sensitivity to the input line impedance at high

frequencies and significantly enhance the output transient

response. Different types and different sizes of input

capacitors can be chosen dependent on the quality of power

supply. The range of 4.7 mF to 150 mF should cover most of

the applications. The higher capacitance the lower change of

input voltage due to line and load transients. The bypass

capacitor should be mounted with shortest possible lead or

track length directly across the regulator’s input terminals.

The output capacitor is required for stability . The NCP566

remains stable with ceramic, tantalum, and aluminum−

electrolytic capacitors with a minimum value of 1.0 mF with

ESR between 50 mW and 2.5 W. The range of 2.2 mF to

150 mF should cover most of the applications. The higher

capacitance the better load transient response. When a high

value capacitor is used, a low value capacitor is also

recommended to be put in parallel. The NCP566 is

optimized for use with a 150 mF OSCON 16SA150M type

in parallel with a 10 mF OSCON 10SL10M type from Sanyo.

The 10 mF capacitor is used for best AC stability while

150 mF capacitor is used for achieving excellent load

transient response. The output capacitors should be placed

as close as possible to the output pin of the device. If not, the

excellent load transient response of NCP566 will be

degraded.

Load Transient Measurement

Large load current changes are always presented in

microprocessor applications. Therefore good load transient

performance is required for the power stage. NCP566 has

the feature of ultra fast transient response. Its load transient

responses in Figures 1 1 through 14 are tested on evaluation

board shown in Figure 17. The evaluation board consists of

NCP566 regulator circuit with decoupling and filter

capacitors and the pulse controlled current sink to obtain

load current transitions. The load current transitions are

measured by current probe. Because the signal from current

probe has some time delay, it causes un−synchronization

between the load current transition and output voltage

response, which is shown in Figures 11 through 14 .

NCP566

Evaluation Board

GEN

GND

Scope Voltage Probe

Pulse

Figure 17. Schematic for Transient Response Measurement

Vout

−VCC

Vin

NCP566

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PCB Layout Considerations

Good PCB layout plays an important role in achieving

good load transient performance. Because it is very sensitive

to its PCB layout, particular care has to be taken when

tackling Printed Circuit Board (PCB) layout. For

microprocessor applications it is customary to use an output

capacitor network consisting of several capacitors in

parallel. This reduces the overall ESR and reduces the

instantaneous output voltage drop under transient load

conditions. The output capacitor network should be as close

as possible to the load for the best results.

Protection Diodes

When large external capacitors are used with a linear

regulator it i s sometimes necessary to add protection diodes.

If the input voltage of the regulator gets shorted, the output

capacitor will discharge into the output of the regulator. The

discharge current depends on the value of the capacitor, the

output voltage and the rate at which Vin drops. In the

NCP566 linear regulator, the discharge path is through a

large junction and protection diodes are not usually needed.

If the regulator is used with large values of output

capacitance an d t h e input voltage is instantaneously shorted

to ground, damage can occur. In this case, a diode connected

as shown in Figure 18 is recommended.

Figure 18. Protection Diode for Large

Output Capacitors

NCP566

GND

VIN VOUT

COUT

CIN

1N4002 (Optional)

Thermal Considerations

This series contains an internal thermal limiting circuit

that is designed to protect the regulator in the event that the

maximum junction temperature is exceeded. This feature

provides protection from a catastrophic device failure due to

accidental overheating. It is not intended to be used as a

substitute for proper heat sinking. The maximum device

power dissipation can be calculated by:

PD+TJ(max) *TA

RqJA

Figure 19. Thermal Resistance

0 50 100 150 200 250 300 350 400 450 50

100

120

140

160

180

COPPER HEAT−SPREADER AREA (mm sq)

qJA

(

C/W)

200

1 oz Cu

2 oz Cu

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ORDERING INFORMATION

Device Nominal Output Voltage* Package Shipping†

NCP566ST12T3G 1.2 V SOT−223

(Pb−Free) 4000 / Tape & Reel

NCP566ST18T3G 1.8 V SOT−223

(Pb−Free) 4000 / Tape & Reel

NCP566ST25T3G 2.5 V SOT−223

(Pb−Free) 4000 / Tape & Reel

*For other fixed output versions, please contact the factory.

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

NCP566

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PACKAGE DIMENSIONS

SOT−223 (TO−261)

CASE 318E−04

ISSUE L

*For additional information on our Pb−Free strategy and soldering

details, please download the ON Semiconductor Soldering and

Mounting Techniques Reference Manual, SOLDERRM/D.

SOLDERING FOOTPRINT*

123

0.08 (0003)

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.

HEDIM

AMIN NOM MAX MIN

MILLIMETERS

1.50 1.63 1.75 0.060

INCHES

A1 0.02 0.06 0.10 0.001

b0.60 0.75 0.89 0.024

b1 2.90 3.06 3.20 0.115

c0.24 0.29 0.35 0.009

D6.30 6.50 6.70 0.249

E3.30 3.50 3.70 0.130

e2.20 2.30 2.40 0.087

0.85 0.94 1.05 0.033

0.064 0.068

0.002 0.004

0.030 0.035

0.121 0.126

0.012 0.014

0.256 0.263

0.138 0.145

0.091 0.094

0.037 0.041

NOM MAX

L1 1.50 1.75 2.00 0.060

6.70 7.00 7.30 0.264 0.069 0.078

0.276 0.287

HE− −

0°10°0°10°

1.5

0.059 ǒmm

inchesǓ

SCALE 6:1

3.8

0.15

2.0

0.079

6.3

0.248

2.3

0.091 2.3

0.091

2.0

0.079

ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice

to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All

operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights

nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications

intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should

Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its of ficers, employees, subsidiaries, affiliates,

and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death

associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal

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PUBLICATION ORDERING INFORMATION

N. American Technical Support: 800−282−9855 Toll Free

USA/Canada

Europe, Middle East and Africa Technical Support:

Phone: 421 33 790 2910

Japan Customer Focus Center

Phone: 81−3−5773−3850

NCP566/D

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Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada

Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada

Email: orderlit@onsemi.com

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Order Literature: http://www.onsemi.com/orderlit

For additional information, please contact your local

Sales Representative

The product described herein (NCP566), may be covered by one or more of the following U.S. patents: 5,920,184; 5,834,926.

There may be other patents pending.