General Description
The MAX5942A/MAX5942B integrate a complete power IC for powered devices (PD) in a power-over-ethernet (PoE) system. The MAX5942A/MAX5942B provide a PD interface and a compact DC-DC PWM controller suitable for flyback and forward converters in either isolated or nonisolated designs.

Features
♦ Powered Device Interface
    Fully Integrated IEEE 802.3af-Compliant PD Interface
    PD Detection and Programmable Classification Signatures
    Less than 10µA Leakage Current Offset During Detection
    Integrated MOSFET for Isolation and Inrush Current Limiting
    Gate Output Allows External Control of the Internal Isolation FET
    Programmable Inrush Current Control/ULVO PGOOD/PGOOD Outputs Enable PWM Controller
♦ PWM Controller
    Wide Input Range: 18V to 67V
    Isolated (Without Optocoupler) or Nonisolated Power Supply
    Current-Mode Control
    Leading-Edge Blanking
    Internally Trimmed 275kHz ±10% Oscillator Soft-Start

Applications
    IP Phones
    Wireless Access Nodes
    Internet Appliances
    Computer Telephony
    Security Cameras
    Power Devices in Power-Over-Ethernet/Power-Over-MDI