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POWER MANAGEMENT

Description

The SC1453 is a low dropout linear regulator that oper-

ates from a +2.5V to +6.5V input range and delivers up

to 150mA. A PMOS pass transistor allows the low 75碌A(chǔ)

supply current to remain independent of load, making

these devices ideal for battery operated portable

equipment such as cellular phones, cordless phones and

personal digital assistants.

150mA Ultra Low Dropout

Regulator with Low Noise Bypass

PRELIMINARY

Features

u

聯(lián)2982/5205聰 compatible pinout

u

Guaranteed 150 mA output current

u

Very small external components - designed to work

with ceramic capacitors

Low 25碌V

RMS

output noise

Very low supply current

Thermal overload protection

Reverse battery protection

Low power shutdown

Full industrial temperature range

Surface mount packaging (5 pin SOT-23)

SC1453

u

u

u

The SC1453 has a bandgap reference bypass pin for

u

very low noise operation - a 10nF (typ.) capacitor is

u

connected between this pin and ground. Other features

u

include low powered shutdown, short circuit protection,

u

thermal shutdown protection and reverse battery

protection. The SC1453 comes in the tiny 5 lead SOT-23

package.

Applications

u

u

u

u

u

u

u

Battery Powered Systems

Cellular Telephones

Cordless Telephones

Personal Digital Assistants

Portable Instrumentation

Modems

PCMCIA cards

Typical Application Circuit

U1

VIN

C1

1uF

1

3

IN

EN

SC1453

OUT

GND BYP

2

5

4

VOUT

C3

1uF

C2

10nF

Revision 2, December 2000

1

www.semtech.com

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