LMS8117A

1A Low-Dropout Linear Regulator

General Description

The LMS8117A is a series of low dropout voltage regulators

with a dropout of 1.2V at 1A of load current. It has the same

pin-out as National Semiconductor’s industry standard

LM317.

The LMS8117A is available in an adjustable version, which

can set the output voltage from 1.25V to 13.8V with only two

external resistors. In addition, it is also available in two fixed

voltages, 1.8V and 3.3V.

The LMS8117A offers current limiting and thermal shutdown.

Its circuit includes a zener trimmed bandgap reference to

The LMS8117A series is available in SOT-223 and TO-252

D-PAK packages. A minimum of 10µF tantalum capacitor is

required at the output to improve the transient response and

stability.

Features

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Available in 1.8V, 3.3V, and Adjustable Versions

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Space Saving SOT-223 and TO-252 Packages

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Current Limiting and Thermal Protection

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Output Current

1A

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Temperature Range

0˚C to 125˚C

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Line Regulation

0.2% (Max)

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Load Regulation

0.4% (Max)

Applications

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Post Regulator for Switching DC/DC Converter

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High Efficiency Linear Regulators

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Battery Charger

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Battery Powered Instrumentation

Typical Application

Fixed Output Regulator

10119628

April 2005

© 2005 National Semiconductor Corporation

DS101196

www.national.com