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