High Efficiency 4A, 21V, 500kHz Synchronous Step-down Converter

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Product Description

The MP8709 is a high frequency synchronous rectified step-down switch mode converter with built in power MOSFETs. It offers a very compact solution to achieve 4A continuous output current over a wide input supply range with excellent load and line regulation. The MP8709 has synchronous mode operation for higher efficiency over output current load range. MP8709 achieves low EMI signature with well controlled switching edges.   Current mode operation provides fast transient response and eases loop stabilization.  Full protection features include OCP and thermal shut down.   The MP8709 requires a minimum number of readily available standard external components and is available in a space saving 8-pin SOIC package with an exposed pad.


Product Features

  • Wide 4.5V to 21V Operating Input Range
  • 4A Output Current
  • Low Rds(on) Internal Power MOSFETs
  • Low-EMI Switching Speed Technology
  • High Efficiency Synchronous Mode Operation 
  • Fixed 500kHz Switching Frequency
  • Sync from 300kHz to 2MHz External Clock
  • Internal Compensation
  • Integrated Bootstrap Diode
  • OCP Protection (Hiccup Mode)
  • Thermal Shutdown
  • Output Adjustable from 0.8V
  • Available in a Thermally Enhanced 8-pin SOIC package


  • fsw (max) (kHz)500
  • Vin (min) (V)4.5
  • Vin (max) (V)21
  • Iout (max) (A)4
  • Isw Limit (typ) (A)6.1
  • Max Duty Cycle (%)0.9
  • Vfb (V)0.805
  • Iq (typ) (mA)0.7
  • Regulated Outputs1
  • Vout (min) (V)0.8
  • GradeCatalog
  • Common FeaturesPower Good, Synchronous Rectification
  • Special FeaturesExternal Frequency Sync

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.