36V, 600mA, 1MHz Non-Sync Step-down Converter with High Light Load Efficiency



The MP4566 is a high frequency (1MHz) step-down switching regulator with integrated internal high-side high voltage power MOSFET. It provides single 0.6A (or less) highly efficient output with current mode control for fast loop response.   The wide 4.5V to 36V input range accommodates a variety of step-down applications in automotive input environment. The very low shutdown mode quiescent current allows use in battery-powered applications.  High power conversion efficiency over a wide load range is achieved by scaling down the switching frequency at light load condition to reduce the switching and gate driving losses.   Frequency fold-back helps prevent inductor current runaway during start-up. Thermal shutdown provides reliable, fault-tolerant operation.  The MP4566 is available in 2x3mm QFN8 package.



  • 35μA Quiescent Current
  • Low Shutdown Mode Current: <2μA
  • Wide 4.5V to 36V Operating Input Range
  • 450mΩ Internal Power MOSFET
  • Fixed 1MHz Switching Frequency
  • Internally compensated
  • Stable with Ceramic Output Capacitors
  • Internal Soft-Start
  • Precision Current Limit Without Current Sensing Resistor
  • High Light Load Efficiency up to 77% at 1mA
  • +1.0V FB Reference Voltage
  • Output Adjustable from +1.0V to 0.8xVIN
  • 2x3mm QFN8 Package


  • fsw (max) (kHz)1000
  • Vin (min) (V)4.5
  • Vin (max) (V)36
  • Iout (max) (A)0.6
  • Isw Limit (typ) (A)1.2
  • Vfb (V)1
  • Iq (typ) (mA)0.035
  • Regulated Outputs1
  • Vout (max) (V)28.8
  • Vout (min) (V)1
  • GradeCatalog
  • PackageQFN-8 (2x3)
  • Control ModeCurrent Mode
  • Common FeaturesLight-Load Efficiency