LP2978

Micropower SOT, 50 mA Low-Noise Ultra Low-Dropout

Regulator

Designed for Use with Very Low ESR Output Capacitors

General Description

The LP2978 is a 50 mA, fixed-output voltage regulator de-

signed to provide ultra low-dropout and low noise in battery

powered applications.

cess, the LP2978 delivers unequalled performance in all

specifications critical to battery-powered designs:

Enhanced Stability: The LP2978 is stable with output ca-

pacitor ESR as low as 5 m

Ω, which allows the use of ceramic

capacitors on the output.

Sleep Mode: Less than 1 µA quiescent current when

ON/OFF pin is pulled low.

Smallest Possible Size: SOT-23 package uses absolute

minimum board space.

Precision Output: 1% tolerance output voltages available

(A grade).

Low Noise: By adding a 10 nF bypass capacitor, output

noise can be reduced to 30 µV (typical).

Features

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Ultra low dropout voltage

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Smallest possible size (SOT-23 Package)

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Requires minimum external components

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Stable with low-ESR output capacitor

1 µA quiescent current when shut down

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Low ground pin current at all loads

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Output voltage accuracy 1% (A Grade)

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High peak current capability

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Wide supply voltage range (16V max)

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Low Z

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Overtemperature/overcurrent protection

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

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Custom voltages available

Applications

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Cellular Phone

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Palmtop/Laptop Computer

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Personal Digital Assistant (PDA)

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Camcorder, Personal Stereo, Camera

Block Diagram

DS100935-1

July 2000

© 2000 National Semiconductor Corporation

DS100935

www.national.com