Fully-Integrated 802.3af/at Compliant PoE PD Interface with High Efficiency Flyback/Forward Controller

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Product Description

The MP8009 is an integrated IEEE 802.3af/at PoE compliantPowered Device (PD) power supply converter. It includes PD interface and high efficiency flyback/forward controller.

The PD interface has all the functions of IEEE 802.3af/at, including detection, 1-event and 2-event classification, 120mA inrush current limit, 840mA operation current limit as well as 100V Hot-swap MOSFET.

The flyback/forward controller is specifically designed for both low cost, small size isolated solution with primary-side regulate (PSR) flyback application, and high efficiency secondary-side regulate (SSR) active-clamped forward application. It also can be used in SSR flyback topology.

The MP8009 can support a front-end solution for PoE-PD application with minimum external components. It is available in QFN-28 (4mmX5mm) package.

Product Features

  • Compatible with 802.3af/at Specifications
  • 100V 0.48Ω PD Integrated Pass Switch
  • 120mA PD Inrush Current
  • 840mA PD Operation Current Limit
  • Auxiliary Adaptor ORing Power Supply
  • Support Flexible Topology Design
  • ¡  Primary-Side Regulated (PSR) Flyback
  • ¡  Secondary-Side Regulated (SSR) Flyback
  • ¡  Secondary-Side Regulated (SSR) Active-Clamp Forward
  • 2A GATE and 0.8A SYNC Drivers
  • 160mV Switching Current Sense Limit
  • Output Diode Compensation in PSR Mode
  • 250kHz Fixed Switching Frequency
  • Hiccup Protection for OLP, SCP, OVP and Thermal Shutdown
  • EMI Reduction with Frequency Dithering
  • Available in QFN-28 (4mmx5mm) Package


  • GradeCatalog
  • PoE Standards Supported802.3af/at
  • PoE Ilimit (mA)840
  • PoE Inrush Limit (mA)120
  • Pass Switch Rds(on) (Ω)0.48
  • PackageQFN-28 (4x5)
  • Fault ResponseHiccup
  • DC/DC TopologyFlyback
  • DC/DC Controller or ConverterController
  • Special FeaturesSupports Primary-Side Regulated Flyback without Opto-Coupler Feedback
  • fsw (kHz)250