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SD4950
POWERED DEVICE (PD) AND DC/DC CONTROLLER COMPATIBLE WITH IEEE 802.3AF STANDARD

SD4950 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.

SD4950 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 150V 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

  • 960mA operating current

  • 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 voltage protection

  • Over current protection

  • Over temperature protection