TMI7303D

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 system. The PD  with a detection signature, classification signature,  and an integrated solation power switch with inrush  current control. During the inrush period, the PD  limit the current to less than 180mA before  switching to the higher current limit (720mA to  920mA) 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 PD support a 2-event  classification method as specified in the IEEE 02.3at standard and provide a signal to indicate  when probed by Type 2 power-sourcing equipment  (PSE). A PG signal set to high indicates when the  output is fully charged and pulls low when the  output drops under the overload condition .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. The TMI7303D is available in a DFN3x3-10  package with exposed pad for low thermal  resistance.