LP38691/LP38693

500mA Low Dropout CMOS Linear Regulators

Stable with Ceramic Output Capacitors

General Description

The LP38691/3 low dropout CMOS linear regulators provide

tight output tolerance (2.0% typical), extremely low dropout

excellent AC performance utilizing ultra low ESR ceramic

output capacitors.

The low thermal resistance of the LLP, SOT-223 and T0-252

packages allow the full operating current to be used even in

high ambient temperature environments.

The use of a PMOS power transistor means that no DC base

drive current is required to bias it allowing ground pin current

to remain below 100 µA regardless of load current, input

voltage, or operating temperature.

Ground Pin Current: 55 µA (typ) at full load.

Precision Output Voltage: 2.0% (25˚C) accuracy.

Features

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2.0% output accuracy (25˚C)

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Wide input voltage range (2.7V to 10V)

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Precision (trimmed) bandgap reference

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Guaranteed specs for -40˚C to +125˚C

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1µA off-state quiescent current

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Thermal overload protection

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Foldback current limiting

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T0-252, SOT-223 and 6-Lead LLP packages

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Enable pin (LP38693)

Applications

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Hard Disk Drives

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Notebook Computers

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Battery Powered Devices

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Portable Instrumentation

Typical Application Circuits

20126501

20126502

Note: * Minimum value required for stability.

**LLP package devices only.

PRELIMINARY

January 2005

© 2005 National Semiconductor Corporation

DS201265

www.national.com