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2004 California Micro Devices Corp. All rights reserved.

01/14/04

430 N. McCarthy Blvd., Milpitas, CA 95035-5112

L Tel: 408.263.3214

L Fax: 408.263.7846 L www.calmicro.com

1

CMPWR161

Micropower, Low Noise 4.75V/150mA LDO Regulator

Features

•

Excellent power supply ripple rejection for

•

Excellent power supply ripple rejection in

audible band (20Hz to 20KHz)

•

Very low dropout voltage (110mV at 150mA)

•

Fast transient response minimizes glitches in

audible band.

•

Low noise in audible band

•

Guaranteed to deliver 150mA output at

4.75V output

•

Low quiescent current—300

•

"Zero" current shutdown mode

•

5205 compatible pin-out

•

5-lead SOT-23 package

•

Lead-free version available

Applications

•

5V analog supply for audio CODEC

•

Low noise power supply ideal for audio use

•

Notebook computers

•

Sound cards

•

Motherboards

•

Set top boxes

Product Description

The CMPWR161 is a micropower, low noise regulator

designed specifically to filter out noise from a 5V digital

supply making it ideal for noise-sensitive analog appli-

cations. The CMPWR161 delivers up to 150mA at a

fixed 4.75V output. A bandgap reference bypass pin

(BYP) provides low noise operation when an external

capacitor is connected between this pin and ground. In

addition, the CMPWR161 features an enable pin (EN)

which allows the regulator to be placed into shutdown

mode supporting low power and battery applications.

The CMOS regulator features low quiescent current

even at full load.

The CMPWR161 is housed in a 5-pin SOT-23 package,

which is ideal for space critical applications. It is avail-

able with optional lead-free finishing.

Simplified Electrical Schematic

Typical Application Circuit

EN

+

GND

-

BYP

4.75V

10kHz

EN

GND

Supply

Voltage

1

100nF

10

+

-

+

+

BYP

10nF

4.75V@

5V

GND

CMPWR161

150mA