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MAX5972A Datasheet IEEE 802.3af/at-Compliant Powered Device Interface Controller

Manufacturer: Maxim Integrated (now Analog Devices)

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General Description

The MAX5972A provides a complete interface for a powered device (PD) to comply with the IEEE® 802.3af/ at standard in a power-over-Ethernet (PoE) system.

The MAX5972A provides the PD with a detection signature, classification signature, and an integrated isolation power switch with inrush current control.

During the inrush period, the MAX5972A limits the current to less than 180mA before switching to the higher current limit (720mA to 880mA) when the isolation power MOSFET is fully enhanced.

Overview

19-4924; Rev 1; 2/10 TION KIT EVALUA BLE A IL A V A www.DataSheet4U.com IEEE 802.

Key Features

  • an input UVLO with wide hysteresis and long deglitch time to compensate for twisted-pair cable resistive drop and to assure glitch-free transition during power-on/-off conditions. The MAX5972A can withstand up to 100V at the input. The MAX5972A supports a 2-event classification method as specified in the IEEE 802.3at standard and provides a signal to indicate when probed by Type 2 power-sourcing equipment (PSE). The device detects the presence of a wall adapter power-source connection and allows.

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