TMI7303B

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.

Applications

• VoIP Telephones
• Security Camera Systems
• Remote Internet Power
• Safety Backup Power

Key features

• Meets IEEE 802.3af/at Specifications
• Support 25W PoE Power Application
• 100V, 0.48Ω Integrated Pass Switch
• 180mA 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 Indicator
• Over Temperature Protection (OTP)
• DFN3x3-10 Package