MIC5264

150mA µCap Dual LDO Regulator

Micro

LeadFrame and MLF are 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 2006

M9999-052406

(408) 955-1690

General Description

The MIC5264 is a dual 150mA LDO in tiny 2.5mm x

2.5mm MLF

is the priority. The MIC5264 is ideal for any application in

portable electronics, including both RF and Digital

applications. With low output noise and high PSRR, the

MIC5264 is ideal for noise sensitive RF applications. While

the fast transient response and active shutdown circuitry

makes it well-suited for powering digital circuitry.

The MIC5264 has a 2.7V to 5.5V input operating voltage

range, making it ideal for operation from a single cell

lithium ion battery or fixed 3.3V and 5V systems. Each

LDO is completely independent and can be powered

independently, making it easier to use in distributed power

applications.

The MIC5264 offers low dropout voltage (210mV at

150mA), low output noise (57µVrms), high PSRR and

integrates an active shutdown circuit on the output of each

regulator to discharge the output voltage when disabled.

Data sheets and supporting documentation can be found

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

Features

•

2.7V to 5.5V supply voltage.

•

Low 75µA quiescent current per LDO.

•

Tiny 2.5mm x 2.5mm MLF

•

Low Noise – 57µVrms.

•

High PSRR – 60dB at 1kHz.

•

Low dropout voltage – 210mV at 150mA.

•

Stable with ceramic output capacitors.

•

Independent enable pins.

•

Fast transient response.

•

Active shutdown on both outputs.

Applications

•

Cellular Telephones

•

PDAs

•

GPS Receivers

Typical Application

MIC5264-xxYML

EN 2

VIN 1

OUT 1

BYP1

GND

VIN 2

EN 1

BYP2

OUT 2

Rx/Synth

Tx

RF

Transceiver

0.01µF

1µF

1µF

1µF

0.01µF

RF Power Supply

0

-10

-20

-40

-50

-60

-70

0.01 0.1

1

10

100 1000

FREQUENCY (kHz)

Power Supply

Rejection Ratio

-30

-80

BYP = 0.1µF

100mA

150mA

50mA