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      SD4952B
      POWERED DEVICE (PD) AND DC/DC CONTROLLER COMPATIBLE WITH IEEE 802.3AF STANDARD

          SD4952B 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.

          SD4952B 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 PSR control. It is suitable for Flyback topology, providing accurate CV control loop. Working in PWM+PFM, 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

      • Power good signal indication

      • Fault automatic retry 

      DC/DC controller 

      • PSR mode

      • Light load frequency reduce mode

      • Leading-Edge Blanking

      • Peak current mode

      • Cycle by cycle current limit

      • Undervoltage lockout

      • Soft startup

      • VCC over voltage protection

      • Short-circuit protection

      • Over current protection

      • Over temperature protection


      Ordering Information
      Product Name Package form Marking Hazardous Substance Control Packing Type Remarks
      SD4952B SOP-16-225-1.27 SD4952B Halogen free Tube
      SD4952BTR SOP-16-225-1.27 SD4952B Halogen free Tape & Reel
      Block Diagram

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      Documents
      title Types of Size (KB) date Download the latest English version
      SD4952B 0 1970-01-01 SD4952B Brief Datasheet
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