MAX5972A
Description
The MAX5972A provides a plete interface for a powered device (PD) to ply with the IEEE® 802.3af/ at standard in a power-over-Ethernet (Po E) 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 180m A before switching to the higher current limit (720m A to 880m A) when the isolation power MOSFET is fully enhanced. The device features an input UVLO with wide hysteresis and long deglitch time to pensate 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...
