LP3879

Micropower 800mA Low Noise "Ceramic Stable" Voltage

Regulator for Low Voltage Applications

General Description

The LP3879 is a 800 mA fixed-output voltage regulator

designed to provide high performance and low noise in

applications requiring output voltages between 1.0V and

1.2V.

cess, the LP3879 delivers superior performance:

Low Power Shutdown: The LP3879 draws less than 10 µA

quiescent current when shutdown pin is pulled low.

Precision Output: Guaranteed output voltage accuracy is

1% at room temperature.

Low Noise: Broadband output noise is only 18 µV (typical)

with 10 nF bypass capacitor.

Features

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Standard output voltage: 1.00V, 1.20V

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Custom voltages available from 1.0V to 1.2V (50 mV

increments)

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Input voltage: 2.5 to 6V

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1% initial output accuracy

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Designed for use with low ESR ceramic capacitors

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Very low output noise

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Sense option improves load regulation

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8 Lead PSOP and LLP surface mount packages

10 µA quiescent current in shutdown

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Low ground pin current at all loads

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High peak current capability

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Over-temperature/over-current protection

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

Applications

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ASIC Power Supplies In:

- Desktops, Notebooks and Graphic Cards

- Set Top Boxes, Printers and Copiers

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DSP and FPGA Power Supplies

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SMPS Post-Regulator

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Medical Instrumentation

Basic Application Circuit

20161303

*Capacitance values shown are minimum required to assure stability. Larger output capacitor provides improved dynamic response. Output capacitor must

meet ESR requirements (see Application Information).

**The Shutdown pin must be actively terminated (see Application Information). Tie to INPUT (Pin 4) if not used.

June 2006

© 2006 National Semiconductor Corporation

DS201613

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