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.
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
The MIC33050 also has a very-low typical quiescent
current of 20µA and can achieve over 85% efficiency even
at 1mA.
>85% efficiency 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.
Micropower shutdown
12-pin 3mm x 3mm MLF®
–40C to +125C junction temperature range
Applications
At higher loads, the MIC33050 provides a constant
switching frequency of greater than 4MHz while providing
peak efficiencies greater than 93%.
Cellular phones
Digital cameras
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 –40C to +125C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
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 +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-050312-C
May 2012