MIC5311

LowQ™ Mode Dual 300mA LDO

MLF and MicroLeadFrame 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

March 2006

M9999-032706

(408) 955-1690

General Description

The MIC5311 is a high performance, dual µCap low

dropout regulator offering ultra-low operating current

and a second, even lower operating current mode,

LowQ™ mode, reducing operating current by 75%.

Each regulator can source up to 300mA of output

current maximum.

Ideal for battery operated applications, the MIC5311

offers 1% accuracy, extremely low dropout voltage

(60mV @ 150mA), and low ground current (typically

28µA total). When put into LowQ™ mode, the internal

current draw drops down to 7µA total. The MIC5311

also comes equipped with a TTL logic compatible

enable pin that allows the part to be put into a zero-off-

mode current state, drawing no current when disabled.

The MIC5311 is a µCap design, operating with very

small ceramic output capacitors for stability, reducing

required board space and component cost.

The MIC5311 is available in fixed output voltages in the

3mm x 3mm MLF-10 leadless package.

Data sheets

and support documentation can be found on Micrel’s

web site at www.micrel.com.

Features

• Input voltage range: 2.5V to 5.5V

• LowQ™ Mode

-

7µA total quiescent current

-

10mA output current capable LowQ™ mode

-

Logic level control with external pin

• Stable with ceramic output capacitor

• 2 LDO Outputs – 300mA each

• Tiny 3mm x 3mm MLF™-10 package

• Low dropout voltage of 60mV @ 150mA

• Ultra-low quiescent current of 28µA total in Full

Current Mode

• High output accuracy

-

±1.0% initial accuracy

-

±2.0% over temperature

• Thermal Shutdown Protection

• Current Limit Protection

Applications

• Cellular/PCS phones

• Wireless modems

• PDAs

• MP3 Players

Typical Application

EN1

EN2

LOWQ

BYP

Baseband

µProcessor

GND

MIC5311-xxBML