AIC2951/2951D

Low Dropout Linear Regulator

Analog Integrations Corporation

4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC

www.analog.com.tw

DS-2951-01 Mar 13, 00

TEL: 886-3-5772500

FAX: 886-3-5772510

1

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Low Dropout Voltage of 130mV at 100mA Output

Current (AIC2951/2951D-50).

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Guaranteed 150mA /300mA Output Current.

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Internal 1.3

Ω P-MOSFET Draws no Base Current.

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Low Ground Current at 55

µA.

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1% Accuracy Output of 3V/3.3V/5V.

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Error Flag Warns of Output Dropout.

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1

µA Supply Current in Shutdown Mode.

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Output Programmable from 1.235V~11V.

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Fast Transient Response.

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Needs only 1

µF for Stability.

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Current and Thermal Limiting.

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Voltage Regulator for Pentium

®

CPUs.

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Wireless Communication System.

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Battery Powered Systems.

The AIC2951/ 2951D series is the enhanced

CMOS version of the LP2951. The superior char-

acteristics of the AIC2951/ 2951D series include

zero base current loss, very low dropout voltage,

and 1% accuracy output voltage. Typical ground

current remains approximately 55

µA, from no

load to maximum loading conditions. Dropout

voltage at 100mA output current is significantly

lower than its bipolar counterpart: 130mV for the

AIC2951-50/2951D-50, 180mV for the AIC2951-

33/ 2951D-33, and 200mV for the AIC2951-30/

2951D-30. Output current limiting and thermal

limiting are built in to provide maximal protection

to the AIC2951/2951D series from fault condi-

tions.

An error flag output, indicating when output volt-

age drops out of regulation, often due to the

falling batteries on the input, can be used for a

power-on reset. A logic-controlled shutdown

input enables the regulator to be switched on and

off. The part may be configured for a fixed output

voltage or programmed from 1.235V to 11V with

an external pair of resistors. The part comes in 8-

pin DIP or SO packages.

ERROR

C2

R2

R1

R3

390

R4

33

Q1

D45H2A

AIC2951

8

7

6

5

4

3

2

1

FB

GND

SENSE

SHDN

TAP

VIN

VOUT

470µF

1000

µF

+

C1

+

Pentium Processor Power Supply