MIC23050_10 Datasheet, PDF (1/14 Pages) Micrel Semiconductor – 4MHz PWM Buck Regulator with HyperLight Load Switching Scheme

MIC23050
4MHz PWM Buck Regulator with
HyperLight Load™ Switching Scheme
General Description
Features
The Micrel MIC23050 is a high efficiency 600mA PWM
synchronous buck (step-down) regulator featuring the
HyperLight Load™ patented 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
HyperLight Load™
• 600mA output current
• Fixed output voltage from 0.72V to 3.3V
• Ultra fast transient response
• 20µA typical quiescent current
The MIC23050 also has a very low typical quiescent
current draw of 20µA and can achieve over 89% efficiency
even at 1mA. The device allows operation with a tiny
inductor ranging from 0.47µH to 2.2µH and uses a small
output capacitor that enables a sub-1mm height.
In contrast to traditional light load schemes, the HyperLight
Load™ architecture does not need to 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 MIC23050 provides a constant
switching frequency of greater than 4MHz while providing
peak efficiencies greater than 93%.
• 4MHz in PWM in constant current mode
• 0.47µH to 2.2µH inductor
• Low voltage output ripple
− 25mV_PP in HyperLight Load™ mode
− 3mV output voltage ripple in full PWM mode
• >93% efficiency
• ~89% at 1mA
• Micropower shutdown
• Available in 8-pin 2mm x 2mm MLF^®
• –40°C to +125°C junction temperature range
Applications
The MIC23050 comes in fixed output voltage options from
0.72V to 3.3V eliminating external feedback components.
The MIC23050 is available in an 8-pin 2mm x 2mm MLF^®
with a junction operating range from –40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• Cellular phones
• Digital cameras
• Portable media players
• Wireless LAN cards
• WiFi/WiMax/WiBro modules
• USB Powered Devices
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Typical Application
HyperLight Load is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Protected by US Patent No. 7064531
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
January 2010
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M9999-012010-D