LMS5258

150mA, µCap, Low Dropout Voltage Regulator with

Power Good

General Description

The LMS5258 is a µCap, precise CMOS voltage regulator

with power good output.

It provides up to 150mA and consumes a typical of 10nA in

shutdown mode. The LMS5258 output stage is designed

with a push pull output for faster transient response.

The LMS5258 is optimized to work with low value, low cost

ceramic capacitors. The output typically require only 1µF of

output capacitance for stability. The enable pin can be tied to

V

The LMS5258 is designed for portable, battery powered

equipment applications with small space requirements.

The LMS5258 is available in a 5-pin SOT-23 package. Per-

formance is specified for the −40˚C to +125˚C temperature

range and is available in a fixed 1.2V. For other output

voltage options, please contact National Semiconductor.

Features

n

Power good indicator

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Stability with low ESR capacitors

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Low ground current: 120µA

n

150mA output current

n

"Zero" shutdown mode current

n

Fast transient response

n

Auto Discharge

n

Thermal shutdown

n

Current limiting

n

TTL-Logic-controlled enable input

n

Applications

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Processor power-up sequencing

n

Laptop, notebook and palm top computer

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PCMCIA V

Typical Application

20042419

Pin Description

Pin Number

Pin Name

Pin Function

1V

IN

Input Voltage

2

GND

Ground

3

EN

Enable Input Logic,

Logic High = Enabled

Logic Low = Shutdown

(Do not leave open)

4

PG

Power Good Output

5V

OUT

Output Voltage

February 2003

© 2003 National Semiconductor Corporation

DS200424

www.national.com