LP3990

150mA Linear Voltage Regulator for Digital Applications

General Description

The LP3990 regulator is designed to meet the requirements

of portable, battery-powered systems providing an accurate

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

LP3990 will provide a 0.8V output from the low input voltage

of 2V at up to 150mA load current. When switched into

shutdown mode via a logic signal at the enable pin, the

power consumption is reduced to virtually zero.

The LP3990 is designed to be stable with space saving

ceramic capacitors as small as 0.47µF.

Performance is specified for a -40˚C to 125˚C junction tem-

perature range.

For output voltages other than 0.8V, 1.35V, 1.5V, 1.8V, 2.5V,

2.8V, or 3.3V please contact your local NSC sales office.

Features

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1% Voltage Accuracy at Room Temperature

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Stable with Ceramic Capacitor

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Logic Controlled Enable

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No Noise Bypass Capacitor Required

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Thermal-Overload and Short-Circuit Protection

Key Specifications

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Input Voltage Range

2.0 to 6.0V

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Output Voltage Range

0.8 to 3.3V

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Output Current

150mA

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Output Stable - Capacitors

0.47uF

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Virtually Zero I

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Very Low I

43uA

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Low Output Noise

150uV

RMS

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PSRR

55dB at 1kHz

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Fast Start Up

105us

Package

All available in Lead Free option.

4 Pin micro SMD

1 mm x 1.28mm

6 pin LLP (SOT23 footprint)

SOT23 - 5

For other package options contact your NSC sales office.

Applications

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Cellular Handsets

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Hand-Held Information Appliances

Typical Application Circuit

20076801

November 2004

© 2004 National Semiconductor Corporation

DS200768

www.national.com