Offline Primary Side 2W Regulator

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Product Description

MP150 is a primary-side regulator that provides accurate constant voltage (CV) regulation without the opto-coupler, and supports buck, buck-boost and flyback topologies. It has an integrated 500V MOSFET that simplifies the structure and reduces costs. These features help to make it a competitive candidate for off-line low power applications, such as home appliances and standby power. MP150 is a green-mode operation regulator. Both the peak current and switching frequency decrease as the load decreases to provide excellent efficiency performance at light load, thus improving the overall average efficiency. The MP150 features various protections, including thermal shutdown (TSD), VCC under-voltage lockout (UVLO), over-load protection (OLP), short-circuit protection (SCP), and open loop protection. MP150 is available in the TSOT23-5 and SOIC8 packages.

Product Features

  • Primary-side constant voltage (CV) control, supporting buck, buck-boost and flyback topologies
  • Integrated 500V/30O MOSFET
  • <150mW No-load power consumption
  • Up to 2W output power
  • Maximum DCM output current less than 120mA
  • Maximum CCM output current less than 200mA
  • Frequency foldback
  • Maximum frequency limitation
  • Peak current compression
  • Internal high-voltage current source


  • Vac (max) (V)265
  • Vfb (V)2.5
  • Vbr (V)500
  • Rds(on) (Ω)30
  • fsw (max) (kHz)56
  • Isw Limit (mA)290
  • Iout (DCM) (max) (mA)120
  • Iout (CCM) (max) (mA)200
  • Pout (max) (W)2
  • Vac (min) (V)20
  • Power Range DefinedYes
  • Control MethodOn-Off
  • PackageSOIC-8, TSOT23-5
  • GradeCatalog
  • TypeBuck Regulator
  • No-Load Pout (max) (mW)150
  • Iregulator (mA)3.5
  • Ileak (µA)10