·Compatible with 802.3af Specifications
·Support 13W PoE Power Application
·100V, 0.48Ω Integrated Pass Switch
·Inrush Current Limit of 120mA Maximum
·Current Limit During Normal Operation Between 400mA and 600mA
·Current Limit and Foldback
·Simplified Wall Adapter Interface
·Integrated 160V Switching Power MOSFET
·Supports Primary-Side Regulated Flyback without Opto-Coupler Feedback
·Supports Low-side Switch Buck Converter
·Up to 3A Programmable Switching Current Limit
·OLP, OVP, OTP and Open-Circuit Protection
·Minimal External Components
·QFN 4mmx5mm-28 Package
The TMI7327A 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. TMI7327A features protection including over current protection, over voltage protection, open circuit protection and thermal shut down. The TMI7327A can support a front-end solution for PoE-PD application with minimum external component, it is available in QFN-28 (4mmX5mm) package.