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