MIC5315

Low Voltage Dual 300mA LDO

with Voltage Select

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

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

July 2008

M9999-070208-A

General Description

The MIC5315 is a high performance, dual low input

voltage, low dropout regulator with voltage select. Major

features include two 300mA LDOs, input voltage down to

1.7V, ultra low drop out of 85mV at full load, and voltage

select. Each LDO has its own low voltage input for system

flexibility. The low input voltages and low drop out

operation provides high efficiency by reducing the input to

output voltage step which minimizes the regulator power

loss. Voltage select is incorporated into the second output,

which reduces the output voltage to a lower level to further

save power while in stand-by mode.

Ideal for battery operated applications; the MIC5315 offers

1% accuracy and low ground current to increase light load

efficiency. The MIC5315 can also be put into a zero-off-

mode current state, drawing virtually no current when

disabled.

The MIC5315 is available in fixed output voltages in the

10-pin 2mm x 2mm Thin MLF

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• 300mA output current for each LDO

• Dual low voltage regulator inputs: 1.7V to 5.5V

• Low output voltage range: 0.8V to 2.0V

• Ultra-low dropout voltage of 85mV @ 300mA

• Voltage select function

• Stable with 1µF ceramic output capacitors

• Very fast transient response

• 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

VBAT

CBIAS

1µF

VIN1

CBYP

VIN2

EN2

VBIAS

EN1

VOUT2

VOUT1

MIC5315-xxyYMT

GND

10nF

1µF

1µF

CIN

1µF

MIC23031-1.8YMT

DC-to-DC

Converter

VI/O

VCORE1

VCORE2

µProcessor

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