LP2989

Micropower/Low Noise, 500 mA Ultra Low-Dropout

Regulator

For Use with Ceramic Output Capacitors

General Description

The LP2989 is a fixed-output 500 mA precision LDO regu-

lator designed for use with ceramic output capacitors.

Output noise can be reduced to 18µV (typical) by connecting

an external 10 nF capacitor to the bypass pin.

cess, the LP2989 delivers superior performance:

Sleep Mode: The LP2989 draws less than 0.8 µA quiescent

current when shutdown pin is pulled low.

Error Flag: The built-in error flag goes low when the output

drops approximately 5% below nominal.

Precision Output: Guaranteed output voltage accuracy is

0.75% (“A” grade) and 1.25% (standard grade) at room

temperature.

Features

n

Ultra low dropout voltage

n

Guaranteed 500 mA continuous output current

n

Very low output noise with external capacitor

n

SO-8, Mini SO-8, 8 Lead LLP surface mount packages

0.8 µA quiescent current when shutdown

n

Low ground pin current at all loads

n

0.75% output voltage accuracy (“A” grade)

n

High peak current capability (800 mA typical)

n

Wide supply voltage range (16V max)

n

Overtemperature/overcurrent protection

n

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

Applications

n

Notebook/Desktop PC

n

PDA/Palmtop Computer

n

Wireless Communication Terminals

n

SMPS Post-Regulator

Block Diagram

10133901

February 2005

© 2005 National Semiconductor Corporation

DS101339

www.national.com