New Industry Products

CCM/DCM Flyback Ideal Diode with Integrated 100V/10mΩ FET and No Need for Auxiliary Winding

October 02, 2019 by Paul Shepard

The MP9989 from Monolithic Power Systems, Inc. is a fast turn-off, intelligent rectifier for flyback converters that integrates a 100V MOSFET. It can replace a diode rectifier for higher efficiency and power density. The chip regulates the forward voltage drop of the internal power switch to 40mV(1) and turns off before the drain-source voltage reverses.

The MP9989 can generate its own supply voltage without the need for auxiliary winding, which makes it suitable for charger applications with a low output voltage requirement or any other adaptor applications with high-side set-up.

The internal ringing detection circuitry prevents the MP9989 from falsely turning on during discontinuous conduction mode (DCM) or quasi-resonant operations. The MP9989 is available in SOIC-8 and QFN4x5-8 packages.

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Product Features

  • Integrated 100V/10mΩ MOSFET
  • Wide Output Range down to 0V
  • No Need for Auxiliary Winding for High-Side or Low-Side Rectification
  • Ringing Detection Prevents False Turn-On during DCM Operations
  • Compatible with Energy Star
  • 110µA Quiescent Current
  • Supports DCM, CCM, and Quasi-Resonant Operations
  • Available in SOIC-8 and QFN4x5-8 Packages

Evaluation Boards

The EV9989-S-00A is the evaluation board for MP9989 SOIC package type.

The EV9989-V-00A is the evaluation board for MP9989 QFN package type.