MIC23060 Datasheet, PDF (1/15 Pages) Micrel Semiconductor – Sequenced Power Management IC with HyperLight Load™ DC/DC and Dual Input LDO™

MIC23060
Sequenced Power Management IC with
HyperLight Load™ DC/DC and
Dual Input LDO™
General Description
Features
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^® package.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
• 2.7V to 5.5V supply voltage range
• Tiny 12-pin 2.5mm x 2.5mm Thin MLF^® package
• 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
_______________________________________________________________________________________________________________________________________
Typical Application
S3 S2 S1 Sequence
X 0 0 ALL OFF
0
0 EN DC-DC ON 1^st / OFF 1^st
0 EN 0 LDO ON 1^st / OFF 1^st
1
0 EN DC-DC ON 1^st / OFF 2^nd
1 EN 0 LDO ON 1^st / OFF 2^nd
X 1 1 ALL ON
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 [phone] • fax + 1 [phone] • http://www.micrel.com
April 2010
M9999-042210-B