LP5900

Ultra Low Noise, 100 mA Linear Regulator for RF/Analog

Circuits Requires No Bypass Capacitor

General Description

The LP5900 is a linear regulator capable of supplying 100

mA output current. Designed to meet the requirements of

RF/Analog circuits, the LP5900 device provides low noise,

high PSRR, low quiescent current, and low line transient

response figures. Using new innovative design techniques

the LP5900 offers class-leading device noise performance

without a noise bypass capacitor.

The device is designed to work with 0.47 µF input and output

ceramic capacitors. (No Bypass Capacitor is required)

This device is available with 1.5V, 1.8V, 2.0V, 2.2V, 2.5V,

2.8V, 3.0V, and 3.3V outputs. Please contact your local sales

office for any other voltage options.

Features

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Stable with 0.47 µF Ceramic Input and Output

Capacitors

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No Noise Bypass Capacitor Required

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Logic Controlled Enable

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Thermal-overload and short-circuit protection

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−40˚C to +125˚C junction temperature range for

operation

Key Specifications

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Input voltage range

2.5V to 5.5V

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Output voltage range

1.5V to 3.3V

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Output current

100 mA

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Low output voltage noise

6.5 µV

RMS

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PSRR

85 dB at 1 kHz

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Output voltage tolerance

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Virtually zero I

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Very low I

25 µA

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Start-up time

150 µs

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Low dropout

80 mV typ.

Package

4-Bump micro SMD

(lead free)

1.057 mm x 1.083 mm

Applications

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Cellular phones

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PDA handsets

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Wireless LAN devices

Typical Application Circuit

20144101

July 2005

© 2005 National Semiconductor Corporation

DS201441

www.national.com