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MIC22400_10 Datasheet, PDF (1/28 Pages) Micrel Semiconductor – 4A Integrated Switch Synchronous Buck Regulator with Frequency Programmable up to 4MHz | |||
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MIC22400
4A Integrated Switch Synchronous
Buck Regulator with Frequency
Programmable up to 4MHz
General Description
The Micrel MIC22400 is a high-efficiency, 4A integrated
switch synchronous buck (step-down) regulator. The
MIC22400 is optimized for highest efficiency, achieving
over 90% efficiency while still switching at 1MHz over a
broad load range. The ultra-high-speed control loop keeps
the output voltage within regulation even under extreme
transient load swings commonly found in FPGAs and low-
voltage ASICs. The output voltage can be adjusted down
to 0.7V to address all low-voltage power needs. The
MIC22400 gives a full range of sequencing and tracking
options. The EN/DLY pin combined with the Power-On-
Reset (POR) pin allows multiple outputs to be sequenced
in any way on turn-on and turn-off. The Ramp Controlâ¢
(RC) pin allows the device to be connected to another
MIC22400 family of products to keep the output voltages
within a certain ÎV on start up.
The MIC22400 is available in a 20-pin 3mm x 4mm MLF®
and thermally enhanced 20-pin e-TSSOP with a junction
operating range from â40°C to +125°C.
Data sheets and support documentation can be found on
Micrelâs web site at: www.micrel.com.
Features
⢠Input voltage range: 2.6V to 5.5V
⢠Output voltage adjustable down to 0.7V
⢠Output load current up to 4A
⢠Full sequencing and tracking ability
⢠Power-On-Reset (POR)
⢠Efficiency > 90% across a broad load range
⢠Programmable frequency 300kHz to 4MHz
⢠Easy Ramp Control⢠(RC) compensation
⢠Ultra fast transient response
⢠100% maximum duty cycle
⢠Fully-integrated MOSFET switches
⢠Micropower shutdown
⢠Thermal shutdown and current-limit protection
⢠20-pin 3mm x 4mm MLF®
⢠20-pin e-TSSOP
⢠â40°C to +125°C junction temperature range
Applications
⢠High power density point-of-load conversion
⢠Servers and routers
⢠DVD recorders
⢠Computing peripherals
⢠Base stations
⢠FPGAs, DSP and low-voltage ASIC power
Typical Application
MIC22400 4A Synchronous Buck Regulator
Sequencing & Tracking
Ramp Control is a 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
December 2010
M9999-120310-F
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