MIC23031_10 Datasheet, PDF (1/18 Pages) Micrel Semiconductor – 4MHz PWM 400mA Buck Regulator with HyperLight Load

MIC23031
4MHz PWM 400mA Buck Regulator with
HyperLight Load™
General Description
The MIC23031 is a high-efficiency 4MHz 400mA
synchronous buck regulator with HyperLight Load™ mode.
HyperLight Load™ provides very-high efficiency at light
loads and ultra-fast transient response which is 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 1.6mm x 1.6mm Thin
MLF^® package saves precious board space and requires
only three external components.
The MIC23031 is designed for use with a very-small
inductor, down to 0.47µH, and an output capacitor as small
as 2.2µF that enables a sub-1mm height.
The MIC23031 has a very-low quiescent current of 21µA
and achieves as high as 88% efficiency at 1mA. At higher
loads, the MIC23031 provides a constant switching
frequency around 4MHz while achieving peak efficiencies
up to 93%.
The MIC23031 is available in a 6-pin 1.6mm x 1.6mm Thin
MLF^® package with an operating junction temperature
range from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Typical Application
Features
• Input voltage: 2.7V to 5.5V
• 400mA output current
• Up to 93% efficiency and 88% at 1mA
• 21µA typical quiescent current
• 4MHz PWM operation in continuous mode
• Ultra-fast transient response
• Low voltage output ripple
– 20mVpp ripple in HyperLight Load™ mode
– 3mV output voltage ripple in full PWM mode
• 0.01µA shutdown current
• Fixed and adjustable output voltage options available
• 6-pin 1.6mm x 1.6mm Thin MLF^®
• –40°C to +125°C junction temperature range
Applications
• Mobile handsets
• Portable media/MP3 players
• Portable navigation devices (GPS)
• WiFi/WiMax/WiBro modules
• Digital Cameras
• Wireless LAN cards
• USB-powered devices
• Portable applications
HyperLight Load is a trademark 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
October 2010
M9999-102210-A