MIC5331

Micro-Power High Performance

Dual 300mA 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 (

February 2008

M9999-021408-A

General Description

The MIC5331 is a tiny dual low quiescent current LDO

ideal for applications that are power sensitive. The

MIC5331 integrates two high performance, 300mA LDOs

into a tiny 2mm x 2mm Thin MLF

occupies less PC board area than a single SOT-23

package.

The MIC5331 is designed to reject input noise and provide

low output noise with fast transient response to any load

change quickly even though it is a low quiescent current

part. This combination of PSRR, low noise and transient

response along with low power consumption makes for a

very high performance, yet general purpose product.

The MIC5331 is a µCap design, operating with very small

ceramic output capacitors, which reduces required board

space and component cost; and it is available in fixed

output voltages in the tiny 8-pin 2mm x 2mm Thin MLF

®

leadless package.

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

• 300mA output current per LDO

• Very low quiescent current: 25µA per LDO

• High PSRR - >65dB on each LDO

• Stable with 1µF ceramic output capacitors

• Ultra-low dropout voltage – 120mV @ 300mA

• Low output voltage noise – 50µVrms

• Thermal shutdown protection

• Current limit protection

Applications

• Camera phones

• Mobile phones

• PDAs

• GPS receivers

• Portable devices

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Typical Application

MIC5331-xxYMT

I/O

CORE

Camera DSP

VIN

EN2

VOUT1

VOUT2

GND

EN1

1µF

VBAT

1µF

1µF

Camera DSP Power Supply Circuit