3A, 7V, 250kHz Integrated Synchronous Step-Down Converter

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Product Description

The MP9403 is a monolithic synchronous buck regulator. The device integrates a 150mΩ high side MOSFET and a 100mΩ low side MOSFET that provides 3A continuous load current over input voltage of 4.3V to 7V. Current mode control provides fast transient response and cycle-by-cycle current limit.  An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current drops to 1μA.  This device, available in an 8-pin SOIC package with exposed pad, provides a very compact system solution with minimal reliance on external components.


Product Features

  • 3A Output Current
  • 4.3V to 7V Operating Input Range
  • Integrated MOSFET Switches
  • Output Adjustable from 0.80V to 5.50V
  • Up to 93% Efficiency
  • Programmable Soft-Start
  • Stable with Low ESR Ceramic Output Capacitors
  • Fixed 250kHz Frequency
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout
  • Thermally Enhanced 8-Pin SOIC Package


  • fsw (max) (kHz)250
  • Vin (min) (V)4.3
  • Vin (max) (V)7
  • Iout (max) (A)3
  • Isw Limit (typ) (A)4.3
  • Max Duty Cycle (%)0.9
  • Vfb (typ) (V)0.8
  • Iq (typ) (mA)1.45
  • Regulated Outputs1
  • Vout (max) (V)5.5
  • Vout (min) (V)0.8
  • GradeCatalog
  • PackageSOIC-8E
  • Common FeaturesExternal Soft Start, Synchronous Rectification