19A, 600kHz, 20V Synchronous Boost Converter with Input Disconnect Function



The MP3428A is a 600kHz, fixed frequency, high-efficiency, wide input range, current-mode boost converter with optional input disconnect and an input average current limit function. The input disconnect feature provides additional protection by isolating the input from the output during output short or shutdown. For battery-operated applications, this feature also helps in preventing battery depletion. With a programmable input average current limit, the MP3428A supports a wide range of applications, including POS, Thunderbolt, Bluetooth Audio, Power Banks, and Fuel Cells. The MP3428A features a 10mΩ, 24V power switch and a synchronous gate driver for high efficiency. An external compensation pin allows flexibility in setting loop dynamics and obtaining optimal transient performance at all conditions.
The MP3428A includes under-voltage lockout, switching current limiting, and thermal shutdown to prevent damage in the event of an output overload.
The MP3428A is available in a low-profile QFN-22 (3mm x 4mm) package. 


  • 3V to 20V Wide Input Range
  • Integrated 10mΩ Low-Side Power FET
  • SDR Driver for Synchronous Solution
  • 19A Internal Switch Current Limit or External Programmable Input Current Limit
  • Input Disconnect and Output SCP
  • External Soft Start and Compensation for Higher Flexibility
  • Programmable UVLO and Hysteresis
  • < 1µA Shutdown Current
  • Thermal Shutdown at 150°C
  • Available in QFN-22 (3mm x 4mm) Package


  • Vout (min) (V)3
  • Vin (min) (V)3
  • Vin (max) (V)20
  • Isw Limit (typ) (A)25
  • Iq (typ) (mA)0.65
  • Regulated Outputs1
  • fsw (max) (kHz)600
  • Vout (max) (V)22
  • Vfb (V)1.225
  • PackageQFN-22 (3x4)
  • GradeCatalog
  • Special FeaturesOutput Disconnect, Programmable UVLO
  • SSExternal
  • Down ModeNo
  • PGNo
  • Input/Output DisconnectYes