MIC23050
4MHz PWM Buck Regulator with
HyperLight Load™ Switching Scheme
y, Inc. Protected by US Patent No. 7064531
l +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
HyperLight Load is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technolog
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • te
September 2011
General Description
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.
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%.
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.
Features
• 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
• 4MHz in PWM in constant-current mode
• 0.47µH to 2.2µH inductor
• Low voltage output ripple
− 25mVPP 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
• Cellular phones
• Digital cameras
• Portable media players
• Wireless LAN cards
• WiFi/WiMax/WiBro modules
• USB-powered devices
____________________________________________________________________________________________________________
Typical Application
1 M9999-092211-E
