LP2985

Micropower 150 mA Low-Noise Ultra Low-Dropout

Regulator in SOT-23 and micro SMD Packages

Designed for Use with Very Low ESR Output Capacitors

General Description

The LP2985 is a 150 mA, fixed-output voltage regulator

designed to provide ultra low-dropout and low noise in bat-

tery powered applications.

cess, the LP2985 delivers unequalled performance in all

specifications critical to battery-powered designs:

Enhanced Stability: The LP2985 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 and micro SMD packages

use 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).

Multiple voltage options, from 2.5V to 5.0V, are available as

standard products. Consult factory for custom voltages.

Features

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Ultra low dropout voltage

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Guaranteed 150 mA output current

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Smallest possible size (SOT-23, micro SMD 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

Ω typical (10 Hz to 1 MHz)

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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

10014001

March 2004

© 2004 National Semiconductor Corporation

DS100140

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