MIC33050_1205 Datasheet, PDF (1/16 Pages) Micrel Semiconductor – 4MHz Internal Inductor PWM Buck Regulator with HyperLight Load

MIC33050
4MHz Internal Inductor PWM Buck
Regulator with HyperLight Load^®
General Description
Features
The Micrel MIC33050 is a high-efficiency 600mA PWM
synchronous buck (step-down) regulator with internal
inductor featuring HyperLight Load, a patent-pending
switching scheme that offers best-in-class light load
efficiency and transient performance while providing very
small external components and low output ripple at all
loads.
The MIC33050 also has a very-low typical quiescent
current of 20µA and can achieve over 85% efficiency even
at 1mA.
In contrast to traditional light load schemes, the HyperLight
Load architecture does not trade off control speed to
obtain low standby currents and in doing so, the device
only needs a small output capacitor to absorb the load
transient as the powered device goes from light load to full
load.
At higher loads, the MIC33050 provides a constant
switching frequency of greater than 4MHz while providing
peak efficiencies greater than 93%.
The MIC33050 is available in fixed and adjustable output
voltages and comes in a 12-pin 3mm x 3mm MLF^® with a
junction operating range of –40C to +125C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
 Input voltage: 2.7V to 5.5V
 600mA output current
 Fixed and adjustable output voltage options
 No external inductor required
 Ultra-fast transient response
 20µA quiescent current
 4MHz switching in PWM mode
 Low output voltage ripple
 >93% peak efficiency
 >85% efficiency at 1mA
 Micropower shutdown
 12-pin 3mm x 3mm MLF^®
 –40C to +125C junction temperature range
Applications
 Cellular phones
 Digital cameras
 Portable media players
 Wireless LAN cards
 WiFi, WiMax, and WiBro modules
 USB-powered devices
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Typical Application
HyperLight Load is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame 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
May 2012
M9999-050312-C