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SD4954B
POWERED DEVICE (PD) AND DC/DC CONTROLLER COMPATIBLE WITH IEEE 802.3AF STANDARD

    SD4954B is an Ethernet powered device and DC/DC controller IC compatible with IEEE 802.3af standard. It provides powered devices (PD) with functions of detection, classification and inrush current limit.

    SD4954B integrates a 100V power MOSFET with on-resistance of 0.6Ω, and features built-in current limit, undervoltage protection and over temperature protection.

The DC/DC controller integrates a 200V power MOSFET with SSR control. It is suitable for Flyback and buck topology, providing accurate CV control loop. It features high system efficiency and good EMI characteristic. 


Main feature

PD controller

  • IEEE 802.3af Compliant

  • 100V 0.6Ω On-chip MOSFET  

  • Undervoltage lockout

  • Over temperature protection 

  • 180mA inrush current limit

  • 850mA operating current

  • Fault automatic retry

DC/DC controller 

  • Fixed switching frequency control

  • Internal error amplifier

  • Leading-Edge Blanking

  • Maximum duty cycle limit

  • No-load sleep mode

  • Soft startup

  • Internal 200V MOSFET

  • VCC over voltage protection

  • VCC undervoltage lockout

  • Over temperature protection

  • Over load protection

  • Cycle-by-cycle current limit


Ordering Information
Product Name Package form Marking Hazardous Substance Control Packing Type Remarks
SD4954BTR SOP-16-225-1.27 SD4954B Halogen free Tape & Reel
SD4954B SOP-16-225-1.27 SD4954B Halogen free Tube