LP3997

Micropower 250mA CMOS LDO Regulator with Error

Flag / Power-On-Reset

General Description

The LP3997 regulator is designed to meet the requirements

of portable, battery-powered systems, providing accurate

output voltage, low noise, and low quiescent current. The

LP3997 provides 3.3V output at up to 250mA load current.

When switched in shutdown mode, the power consumption

is virtually zero.

The LP3997 is designed to be stable with space saving

ceramic capacitors as small as 1µF.

The LP3997 also includes an out-of-regulation error flag.

When the output is more than 5% below its nominal voltage,

the error flag sets to low. If a capacitor is connected to

device’s delay pin, a delayed power-on reset signal will be

generated.

Features

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Low, 140mV, Dropout at 250mA Load.

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Stable with Ceramic Capactor.

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Low Noise, with Bypass Capacitor.

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Less than 70µA Typical I

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Virtually Zero I

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Themal and Short Circuit Protection.

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3.3V Output.

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For other voltage options, please contact your local NSC

sales office.

Package

8 Lead MSOP

For other package options contact your NSC sales office.

Applications

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Portable Consumer Electronics

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Cellular Handsets

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Laptop and Palm Computers

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PDA’s

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Digital Cameras

Typical Application Circuit

20092901

PRELIMINARY

May 2004

© 2004 National Semiconductor Corporation

DS200929

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