700V Non-Isolated Regulator up to 400mA Output Current

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Product Description

MP174 is a primary-side regulator that provides accurate constant voltage (CV) regulation without opto-coupler. It supports Buck, Buck-Boost, Boost and Flyback topologies. It has an integrated 700V MOSFET to simplify the structure and reduce costs. These features make it an ideal regulator for off-line low power applications, such as home appliances and standby power. MP174 is a green-mode operation regulator. Both the peak current and switching frequency decrease as the load decreases. This feature provides excellent efficiency at light load, and improves the overall average efficiency. MP174 features various protections, including thermal shutdown (OTP), VCC under-voltage lockout (UVLO), overload protection (OLP), short-circuit protection (SCP), and open loop protection. MP174 is available in small TSOT23-5 package and SOIC8 package.

Product Features

  • Primary-side CV control, supporting Buck, Buck-Boost, Boost and Flyback topologies
  • Integrated 700V/13.5O MOSFET and current source
  • <30mW no-load power consumption
  • Up to 5W output power
  • Maximum DCM output current less than 250mA
  • Maximum CCM output current less than 400mA
  • Low VCC Operating Current
  • Frequency foldback
  • Limited maximum frequency
  • Peak-current compression
  • Internally biased VCC
  • OTP, UVLO, OLP, SCP, open loop protection


  • Vac (max) (V)305
  • Vfb (V)2.5
  • Vbr (V)700
  • Rds(on) (Ω)13.5
  • fsw (max) (kHz)83
  • Isw Limit (mA)660
  • Iout (DCM) (max) (mA)250
  • Iout (CCM) (max) (mA)400
  • Pout (max) (W)5
  • Vac (min) (V)20
  • Power Range DefinedNo
  • Control MethodOn-Off
  • PackageSOIC-8, TSOT23-5
  • GradeCatalog
  • TypeBuck Regulator
  • No-Load Pout (max) (mW)30
  • Iregulator (mA)4.1
  • Ileak (µA)10