MIC5337

Ultra Low Dropout with Auto Discharge

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

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

September 2008

M9999-090908-A

General Description

The MIC5337 is a low quiescent current, low dropout

regulator with an internal auto discharge feature designed

for optimal performance in a small space. The MIC5337 is

capable of sourcing 300mA of output current while only

consuming 24µA of operating current. When the MIC5337

is disabled an internal resistive load is automatically

applied to the output to discharge the output capacitor.

This high performance LDO offers fast transient response

as well as maintaining a high PSRR.

The MIC5337 is an ideal solution for battery operated

applications due to ultra low operating current and

extremely low dropout voltage of 180mV at 300mA.

Equipped with a TTL logic compatible enable pin, the

MIC5337 can be put into a zero-off-mode current state,

drawing virtually no current when disabled.

Board space and component cost is minimized because

the MIC5337 operates with very small 1μF ceramic

capacitors, provides fixed output voltages, and is available

in the tiny 1.2mm x 1.6mm Thin MLF package.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• 300mA output current

• Low dropout voltage of 180mV @ 300mA

• Active discharge when enable pin is low

• Input voltage range: 2.3V to 5.5V

• Fixed output voltages

• Stable with 1μF ceramic capacitors

• Thermal shutdown and current limit protection

Applications

• Mobile phones

• GPS and navigation devices

• Portable media players

• Digital still and video cameras

• PDAs

• Portable electronics

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Typical Application

MIC5337-xxYMT

VIN

VEN

VOUT

GND

1µF

1µF

VBAT

VOUT