General Description
The MAX5940A/MAX5940B/MAX5940C/MAX5940D provide complete interface function for a powered device (PD) to comply with the IEEE 802.3af standard in a power-over-ethernet system. MAX5940A/MAX5940B/MAX5940C/MAX5940D provide the PD with a detection signature, a classification signature, and an integrated isolation switch with programmable inrush current control.

Features
♦ 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
♦ 90V Absolute Maximum Rating (MAX5940C/MAX5940D)
♦ Gate Output Allows External Control of the Internal Isolation MOSFET
♦ Programmable Inrush Current Control
♦ Programmable Undervoltage Lockout (MAX5940B/MAX5940D Only)
♦ Wide UVLO Hysteresis Accommodates TwistedPair Cable Voltage Drop
♦ PGOOD/PGOOD Outputs to Enable Downstream DC-DC Converters
♦ -40°C to +85°C Operating Temperature Range

Applications
    IP Phones
    Security Cameras
    Wireless Access Nodes
    IEEE 802.3af Power Devices
    Computer Telephony