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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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