Higher Power, Offline inductor-less Controller w/external BJT



The MP103 provides an easy and low cost ACDC solution for less than 1W applications. It is an off-line linear regulator that delivers good efficiency while generating little EMI noise. It provides an easy solution to step down the AC line voltage to a regulated DC voltage. This off-line linear regulator replaces the conventional switching regulator, not needing a transformer or an inductor. Due to its simplicity, it offers an overall low BOM cost. MP103 delivers nearly two times the output power than the MP100 or MP100L by charging its VB capacitor with an external bipolar transistor. MP103 maximizes efficiency by minimizing the voltage drop between VB and VOUT, while only charging VB when VIN is less than approximately 32V. The MP103 enables the overall system to meet standby power requirements. MP103 offers rich protections, such as Thermal Shutdown (TSD), Over Temperature Protection (OTP), VB Over Voltage Protection (OVP), VB Short to GND Protection, Over Load Protection (OLP), Short Circuit Protection (SCP), MP103 is available in the SOIC8E package.


  • Universal AC Input (85Vac-305Vac)
  • Inductor-less
  • Less than 100mW standby power
  • Excellent EMI Performance
  • Lower BOM Cost
  • Smart Control to Maximizes Efficiency
  • Adjustable Output Voltage from 1.5V to 15V
  • Good Line and Load Regulation
  • Drives External BJT
  • Short Circuit Protection
  • External Programmable Over Temperature
  • Protection (OTP)


  • Pout (max) (mW)800
  • Vac (min) (V)85
  • Vbr (V)700
  • Vdropout (V)999
  • Vref (V)1.235
  • Vac (max) (V)305
  • Vout (max) (V)15
  • Vout (min) (V)1.5
  • TypeLinear Controller
  • GradeCatalog
  • Power Range DefinedNo