LP5951

Micropower, 150mA Low-Dropout CMOS Voltage

Regulator

General Description

The LP5951 regulator is designed to meet the requirements

of portable, battery-powered systems providing a regulated

output voltage and low quiescent current. When switched to

shutdown mode via a logic signal at the Enable pin, the

power consumption is reduced to virtually zero.

The LP5951 is designed to be stable with small 1µF/1.5µF

ceramic capacitors.

The LP5951 also features internal protection against short-

circuit currents and over-temperature conditions.

Performance is specified for a -40˚C to 125˚C temperature

range.

The device is currently available in SOT23-5 package and

will be available in SC70-5 package soon.

The device is available in fixed output voltages in the range

of 1.3V to 3.3V. For availability, please contact your local

NSC sales office.

Features

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Excellent PSRR: -60dB at 1kHz typ.

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Low quiescent current of 29µA typ.

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1.8 to 5.5V input voltage range

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Small SOT23-5 package

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Fast turn-on time of 30µs typ.

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Guaranteed 150mA output current

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Output voltage range: 1.3V to 3.3V

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Logic controlled enable 0.4V/0.9V

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Good load transient response of 50mVpp typ.

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Thermal-overload and short-circuit protection

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-40˚C to +125˚C junction temperature range

Applications

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General purpose

Typical Application Circuit

20136201

June 2006

© 2006 National Semiconductor Corporation

DS201362

www.national.com