LP3878

Micropower 800mA Low Noise "Ceramic Stable" Voltage

Regulator for Low Voltage Applications

Designed for Use with Very Low ESR Output Capacitors

General Description

The LP3878 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.

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

an external 10 nF capacitor to the bypass pin.

cess, the LP3878 delivers superior performance:

Sleep Mode: The LP3878 draws less than 2.0 µA quiescent

current when shutdown pin is pulled low.

Precision Output: Guaranteed output voltage accuracy is

1% at room temperature.

Features

n

Standard output voltage: 1.00V

n

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

increments)

n

Input voltage: 2.2 to 6.0V

n

1% initial output accuracy

n

Guaranteed 800 mA continuous output current

n

Designed for use with low ESR ceramic capacitors

n

Very low output noise with external capacitor

n

Sense option improves load regulation

n

8 Lead LLP surface mount package

2.0 µA quiescent current in shutdown

n

Low ground pin current at all loads

n

High peak current capability (1200 mA typical)

n

Overtemperature/overcurrent protection

n

0˚C to +125˚C junction temperature range

Applications

n

ASIC Power Supplies In:

- Desktops, Notebooks and Graphic Cards

- Set Top Boxes, Printers and Copiers

n

DSP and FPGA Power Supplies

n

SMPS Post-Regulator

Basic Application Circuit

20086803

*Capacitance values shown are minimum required to assure stability, but may be increased without limit. Larger output capacitor provides improved dynamic

response. Output capacitor must meet ESR requirements (see Application Hints).

**Shutdown must be actively terminated (see App. Hints). Tie to INPUT (Pin4) if not used.

November 2004

© 2004 National Semiconductor Corporation

DS200868

www.national.com