The Future of Analog IC Technology
The MP28256 is a synchronous rectified step-
down switch mode converter with built in
internal power MOSFETs. It offers a very
compact solution to achieve 3A continuous
output current over a wide input supply range
with excellent load and line regulation. The
MP28256 has synchronous mode operation for
higher efficiency over output current load range.
Current mode operation provides fast transient
response and eases loop stabilization. Full
protection features include OCP and thermal
The MP28256 requires a minimum number of
readily available standard external components
and is available in a space saving QFN14
21V, 3A 500kHz Synchronous
• Wide 4.5V to 21V Operating Input Range
• 0.6V internal reference with 2% accuracy
• 3A Output Current
• Low Rds(ON) Internal Power MOSFETs
• Fixed 500kHz Switching Frequency
• Frequency SYNC from 300kHz to 2MHz
• External Soft Start
• OCP and Thermal Shutdown
• Separate EN and SYNC pins
• Available in a QFN14 (3x4mm) Package.
• DSL Modems
• Cable Modems
• Set Top Boxes
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
Efficiency vs. Load Current
0 0.5 1 1.5 2 2.5 3 3.5
LOAD CURRENT (A)
MP28256 Rev. 1.01
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