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TMI7303B

802.3af/at Power over Ethernet PoE Powered Device (PD) Controller

产品详细信息

特性
说明

·Meets IEEE 802.3af/at Specifications  

·Support 25W PoE Power Application 

·100V, 0.48Ω Integrated Pass Switch 

·140mA Inrush Current Limit 

·Current Limit During Normal Operation  Between 720mA and 920mA  

·Simplified Wall Adapter Interface 

·Open Drain Type-2 PSE Indicator 

·Current Limit and Fold-back 

·Self-Driving Power Good Inductor 

·Over Temperature Protection (OTP) 

·DFN3x3-10 Package

The TMI7303B provides a complete interface for a  Powered Device (PD) with the IEEE 802.3af/at standard in PoE system. The TMI7303B include  detection signature, classification signature and an integrated isolation power switch with inrush  current control mode. It supports a 2-event  classification method as specified provide a signal  to indicate when probed by Type 2 power-sourcing  equipment (PSE). 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 adapter. Thermal protection is  built in to accommodate both transient and/or  overload conditions, shutting the part down and  protecting the input source as well as the output  load depending on the particular fault conditions.  Inrush current limiting is included to slowly charge  the input capacitor without interruption due to die  heating, a problem encountered without the current  limit fold back feature. The TMI7303B is available in a DFN3x3-10  package with exposed pad for low thermal  resistance.

TMI7303B
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TMI7303B

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