High Efficiency, 20V, 4A Synchronous Step-Down Converter with Low Rds on, SS and Low Power Mode

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Product Description

The MP28251 is a synchronous, rectified, step-down, switch-mode converter with internal power MOSFETs. It offers a very compact solution to achieve a 4A continuous output current over a wide input supply range with excellent load and line regulation. The MP28251 has synchronous mode operation for higher efficiency over the output current load range.  Current-mode operation provides a fast transient response and eases loop stabilization. Full protection features include over-current protection and thermal shutdown.  The MP28251 requires a minimal number of readily-available standard external components and is available in a space saving 2mm×3mm 14-pin QFN package.


Product Features

  • Wide 4.75V-to-20V Operating Input Range
  • 4A Output Current
  • Low RDS(ON) Internal Power MOSFETs
  • Programmable Switching Frequency
  • Programmable EN Delay
  • Frequency SYNC from 300kHz to 2MHz External Clock
  • Low Power Mode Selectable by an External Signal
  • External Soft Start
  • OCP and Thermal Shutdown
  • Available in a 14-pin QFN2×3 Package


  • fsw (max) (kHz)2000
  • Vin (min) (V)4.75
  • Vin (max) (V)20
  • Iout (max) (A)4
  • Isw Limit (typ) (A)5.6
  • Max Duty Cycle (%)0.95
  • Vfb (V)0.815
  • Iq (typ) (mA)1
  • Regulated Outputs1
  • Vout (max) (V)17
  • Vout (min) (V)0.8
  • GradeCatalog
  • PackageQFN-14 (2x3)
  • Control ModeCurrent Mode
  • Common FeaturesExternal Soft Start, Light-Load Efficiency, Synchronous Rectification
  • Special FeaturesExternal Frequency Sync, Programmable Frequency

Reference Materials

Quality Policy, Certificates & Reliability Reports
All MPS parts are lead-free, halogen-free and adhere to the RoHS directive. See Environmental section for details.