MIC5321

Dual, High Performance

150mA µCap ULDO™

ULDO is a trademark of Micrel, Inc.

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

May 2008

M9999-051508-E

General Description

The MIC5321 is a tiny Dual Ultra Low-Dropout

(ULDO™) linear regulator ideally suited for those

applications that require high PSRR because it

provides a bypass pin for those noise sensitive

portable electronics. The MIC5321 integrates two

high-performance; 150mA ULDOs into a very compact

1.6mm x 1.6mm leadless Thin MLF

provides exceptional thermal package characteristics.

The MIC5321 is a µCap design which enables

operation with very small ceramic output capacitors

for stability, thereby reducing required board space

and component cost. The combination of extremely

low-drop-out

voltage,

very

high

power

supply

rejection, very low output noise and exceptional

thermal package characteristics makes it ideal for

powering RF application, cellular phone camera

modules, imaging sensors for digital still cameras,

PDAs, MP3 players and WebCam applications.

The MIC5321 ULDO™ is available in fixed-output

voltages in the tiny 6-pin 1.6mm x 1.6mm leadless

Thin MLF

less than 30% the area of the SOT-23, TSOP and

MLF

SOT-23-6 lead package and the standard 6-pin

1.6mm x 1.6mm leadless package. Additional voltage

options are available. For more information, contact

Micrel marketing department.

Data sheets and support documentation can be found

on Micrel’s web site at www.micrel.com.

Features

•

2.3V to 5.5V input voltage range

•

Ultra-low dropout voltage ULDO™ 35mV @

150mA

•

Tiny 6-pin 1.6mm x 1.6mm Thin MLF

package

•

Low cost TSOT-23-6 package

•

Bypass pin for improved noise performance

•

High PSRR – >75dB on each LDO

•

Ultra low noise output - > 30µVrms

•

Dual 150mA outputs

•

µCap stable with 1µF ceramic capacitor

•

Low quiescent current – 150µA

•

Fast turn-on time – 45µs

•

Thermal shutdown protection

•

Current Limit protection

Applications

•

Mobile phones

•

PDAs

•

GPS receivers

•

Portable electronics

•

Portable media players

•

Digital still and video cameras

Typical Application

VIN

EN

VOUT 1

VOUT 2

GND

MIC5321-x.xYML

1µF

0.01µF

BYP

1µF

Rx/Synth

Tx

RF

Transceiver

1µF

RF Power Supply Circuit