MIC23060

Sequenced Power Management IC with

HyperLight Load™ DC/DC and

Dual Input LDO™

HyperLight Load and Dual Input LDO are trademarks of Micrel, Inc

MLF and MicroLead frame are registered 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

April 2010

M9999-042210-B

General Description

The MIC23060 is a highly efficient power management IC

integrating a high frequency DC/DC converter with

HyperLight Load™ mode and a low input voltage capable

LDO. The MIC23060 offers two output voltages at very

high efficiency on both outputs while maintaining a low

total system cost.

The MIC23060 also provides sequencing of the two

outputs in every potential combination of turn-on and turn-

off sequencing by connecting two pins either high or low,

and using a single GPIO to enable and disable the device.

The LDO is designed both to post regulate from the output

of the DC/DC converter for high system efficiency, and/or

power directly from the battery. For sequences where the

LDO is enabled prior to the DC/DC output, the LDO is first

powered by the input voltage (typically the battery source)

and then after the DCDC soft start is complete, seamlessly

transition LDO input power to draw from the output of the

DC/DC converter for higher efficiency operation through

post-regulation.

The DC/DC converter in the MIC23060 is a HyperLight

Load™ converter with very high efficiency at light load and

at full operating current, maintaining high efficiency across

all operating modes in portable electronics.

The MIC23060 is a µCap design, operating with small

ceramic output capacitors and tiny inductors for stability,

reducing required board space and component cost and is

available in the tiny 2.5mm x 2.5mm Thin MLF

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• 2.7V to 5.5V supply voltage range

• Integrated sequencing

– Dual Input LDO™ can turn-on prior to DC/DC

converter and automatically switch to post regulation

from the DC/DC converter after it starts

– Power for LDO from input during start-up

– Adjustable delay time between outputs

• Zero-current off mode

• Current-limit and thermal shutdown protection

HyperLight Load™ DC/DC Converter

• Up to 600mA output current in PWM mode (shared

between switcher and linear LDO regulator outputs)

• 4MHz frequency in continuous PWM mode

• Tiny 2.2µH inductor, 4.7µF capacitor

• 85% Efficiency at 1mA output current

• >90% peak efficiency

• Low output voltage ripple across all loads

LDO Regulator

• Low Input voltage LDO regulator

• Stable with ceramic output capacitors

• Regulates from the output of the DC/DC converter

• 300mA output current capability

• High Accuracy: ±3% over temperature

• High PSRR: greater than 60dB

• Very low quiescent current: 16µA

Applications

• Mobile phones

• PDAs/pocket PCs

• Digital cameras/DSP power supply

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Typical Application

S3

S2

S1

Sequence

X

0

0

ALL OFF

0

0

EN

DC-DC ON 1

0

EN

0

LDO ON 1

1

0

EN

DC-DC ON 1

1

EN

0

LDO ON 1

X

1

1

ALL ON