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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 Datasheet PDF 167 2021-09-17 SD4952B Datasheet