TMI7327B

The TMI7327B is an integrated IEEE 802.3af  compatible PoE Powered Device with PD interface  and power converter. It is targeted for isolated or  non-isolated 13W PoE application. The PD provide 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 PD with a detection signature, classification  signature, and an integrated isolation power switch  with inrush current control. During the inrush period,  the PD limit the current to less than 120mA before  switching to the higher current limit (400mA to  600mA) when the isolation power MOSFET is fully  enhanced. The devices feature 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 poweron/-off conditions. The PD can withstand up to  100V at the input. The devices detect the presence  of a wall adapter power-source connection and  allow a smooth switchover from the PoE power  source to the wall power adapter. The intelligent  MPS function enables applications requiring very  low power standby modes. TMI7327B features protection including over  current protection, over voltage protection, open  circuit protection and thermal shut down. The  TMI7327B can support a front-end solution for  PoE-PD application with minimum external component, it is available in QFN-28 (4mmX5mm)  package.