LP2989 datasheet(2/19 Pages) TI

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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.

Using an optimized VIP™ (Vertically Integrated PNP) pro-

cess, the LP2989 delivers superior performance:

Dropout Voltage: Typically 310 mV @ 500 mA load, and 1

mV @ 100 µA load.

Ground Pin Current: Typically 3 mA @ 500 mA load, and

110 µA @ 100 µA load.

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.

For output voltages < 2V, see LP2989LV datasheet.

Features

Ultra low dropout voltage

Guaranteed 500 mA continuous output current

Very low output noise with external capacitor

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

n <

0.8 µA quiescent current when shutdown

Low ground pin current at all loads

0.75% output voltage accuracy (“A” grade)

High peak current capability (800 mA typical)

Wide supply voltage range (16V max)

Overtemperature/overcurrent protection

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

Applications

Notebook/Desktop PC

PDA/Palmtop Computer

Wireless Communication Terminals

SMPS Post-Regulator

Block Diagram

10133901

VIP™ is a trademark of National Semiconductor Corporation.

February 2005

DS101339

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