Synchronous Step-Down Converter with External Soft Start



The MP4569 is a step-down switching regulator with integrated high-side/low-side, high-voltage power MOSFETs. It provides a highly efficient output of up to 0.3A.
The wide 4.5V to 75V input range accommodates a variety of step-down applications in automotive environment. A 3.5μA shutdown mode quiescent current is good for battery-powered applications.
It allows for high power conversion efficiency over a wide load range by scaling down the switching frequency under light-load condition to reduce the switching and gate driver losses. 
The switching frequency during start-up and short circuit also can be scaled down to prevent inductor current runaway. Thermal shutdown provides reliable, fault-tolerant operation.
The MP4569 is available in QFN-10 (3mmx3mm) and SOIC-8 EP packages.



  • 20μA Quiescent Current (Active mode)
  • Wide 4.5V to 75V Operating Input Range
  • 1.2Ω/0.45Ω Internal Power MOSFETs
  • Programmable Soft-Start
  • FB-Tolerance: 1% at Room Temperature; 2% at Full Temperature.
  • Adjustable Output
  • 1V Reference Voltage Output for QFN Package
  • Low Shutdown Mode Current: 3.5μA
  • Available in QFN-10 (3mmx3mm) and SOIC-8 EP Packages


  • fsw (max) (kHz)1000
  • Vin (min) (V)4.5
  • Vin (max) (V)75
  • Iout (max) (A)0.3
  • Vfb (V)1
  • Iq (typ) (mA)0.02
  • GradeCatalog
  • PackageQFN-10 (3x3)
  • Control ModeCurrent Mode
  • Common FeaturesExternal Soft Start, Power Good, Synchronous Rectification
  • Special FeaturesProgrammable Frequency