MIC23163/4
4MHz, 2A, 100% Duty Cycle Buck Regulator
with HyperLight Load
®
and Power Good
General Description
The MIC23163/4 is a high-efficiency, 4MHz, 2A,
®
synchronous buck regulator with HyperLight Load (HLL)
mode and maximum 100% duty cycle. HLL provides very-
high efficiency at light loads and ultra-fast transient
response which makes the MIC23163/4 perfectly suited for
supplying processor core voltages. An additional benefit of
this proprietary architecture is very low output ripple
voltage throughout the entire load range with the use of
small output capacitors. The tiny 2.0mm × 2.0mm DFN
package saves precious board space and requires only
three external components.
The MIC23163/4 is designed for use with a very small
0.47µH inductor and 10µF output capacitor that enables a
total solution size, less than 1mm height.
The MIC23163/4 has a very low quiescent current of 33µA
and achieves as high as 85% efficiency at 1mA. At higher
loads, the MIC23163/4 provides a constant switching
frequency around 4MHz while achieving peak efficiencies
up to 93%. The MIC23164 incorporates an active
discharge feature that switches an 180Ω FET to ground to
discharge the output when the part is disabled.
The MIC23163/4 is available in 10-pin 2.0mm × 2.0mm
DFN package with an operating junction temperature
range from –40°C to +125°C.
Datasheets and support documentation are available on
Micrel’s web site at:
Features
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Input voltage: 2.7V to 5.5V
100% duty cycle
2A output current
Up to 93% peak efficiency
85% typical efficiency at 1mA
Programmable soft-start with pre-bias start-up capability
Power Good (PG) Indicator
4MHz PWM operation in continuous mode
Ultra-fast transient response
Low ripple output voltage
Fully-integrated MOSFET switches
0.1µA shutdown current
Thermal shutdown and current-limit protection
10-pin 2.0mm × 2.0mm Thin DFN
–40°C to +125°C junction temperature range
Disable pull down 180Ω (MIC23164 only)
Applications
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Cellular modems
Mobile handsets
Portable media/MP3 players
Portable navigation devices (GPS)
WiFi/WiMax/WiBro modules
Digital cameras
Wireless LAN cards
Typical Application
HyperLight Load is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
June 29, 2013
Revision 2.0
MICREL [ MICREL SEMICONDUCTOR ]
