TMI TMI7301

TMI7301 provides a complete interface for a powered device (PD) to comply with the IEEE 802.3af standard in a Power-over-Ethernet (PoE) system. TMI7301 provides the PD with a detection signature, classification signature, and an integrated isolation power switch with inrush current control. During the inrush period, TMI7301 limit the current to less than 150mA before switching to the higher current limit (400mA to 500mA) when the isolation power MOSFET is fully enhanced. The device features 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. TMI7301 can withstand up to 100V at the input. TMI7301 also provides a powergood (PG) signal, two-step current limit and foldback, over temperature protection, and di/dt limit. TMI7301 automatically generates the necessary pulsed current to maintain the PSE power. An external resistor is used to enable this functionality and to program the MPS pulsed current amplitude

• Meets IEEE 802.3af Specifications
• 100V, 0.6Ω Integrated Pass Switch MOSFET
• 150mA inrush current limit
• 450mA DC Input Current Limit
• Over-temperature protection
• PGOOD with selectable logic and Inrush Completion Delay
• Intelligent Maintain Power Signature (MPS)
• SOP8 Package

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