21V, 3A, 500kHz, Synchronous Step-Down Converter with Low Rds on, SS and AAM (LL Mode)

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Product Description

The MP28266 is a synchronous, rectified, step-down, switch-mode converter with built in internal power MOSFETs. It offers a very compact solution to achieve a 3A continuous output current over a wide input supply range, with excellent load and line regulation. The MP28266 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 MP28266 requires a minimal number of readily-available standard external components, and is available in a space-saving 3mm×4mm 14-pin QFN package.


Product Features

  • Wide 6V-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 a 300kHz-to-2MHz External Clock
  • External Soft-Start
  • AAM Power-Save Mode
  • OCP and Thermal Shutdown
  • Available in a 3mm×4mm QFN14 Package.


  • fsw (max) (kHz)500
  • Vin (min) (V)6
  • Vin (max) (V)21
  • Iout (max) (A)3
  • Isw Limit (typ) (A)5.5
  • Max Duty Cycle (%)0.9
  • Vfb (V)0.603
  • Iq (typ) (mA)0.6
  • Regulated Outputs1
  • Vout (max) (V)18
  • Vout (min) (V)0.6
  • GradeCatalog
  • PackageQFN-14 (3x4)
  • Control ModeCurrent Mode
  • Common FeaturesExternal Soft Start, Light-Load Efficiency, Synchronous Rectification
  • Special FeaturesExternal Frequency Sync

Reference Materials