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 lowvoltage 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-OnReset (POR) pin allows multiple outputs to be sequenced
in any way on turn-on and turn-off. The Ramp Controlв„ў
(RC) pin allows the device to be connected to another
MIC22400 family of products to keep the output voltages
within a certain О”V on start-up.
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The MIC22400 is available in a 20-pin 3mm x 4mm MLF
and thermally-enhanced 20-pin ePad TSSOP with a
junction operating range from –40°C to +125°C.
Data sheets and support documentation can be found on …