IEEE 802.3bt PD Interface with Forward/Flyback Controller

The LT4295 is an IEEE 802.3af/at/bt-compliant powered device (PD) interface controller with a switching regulator controller. The T2P output indicates the number of classification events received during IEEE 802.3bt-compliant mutual identification and negotiation of available power.

The LT4295 supports both forward and flyback power supply topologies. The flyback topology supports No-Opto feedback. Auxiliary input voltages can be accurately sensed with just a resistor divider connected to the AUX pin.

The LT4295 utilizes an external, low RDS(on) N-channel hot swap MOSFET and supports the LT4320/LT4321 ideal diode bridges, to extend the end-to-end power delivery efficiency and eliminate costly heat sinks.

The LT4295 also includes an on-chip detection signature resistor, thermal protection, slope compensation, and many user configurable settings including classification signature, inrush current, switcher frequency, gate drive delay, soft-start and load compensation.

Applications

* High Power Wireless Data Systems

* Outdoor Security Camera Equipment

* Commercial and Public Information Displays

* High Temperature Applications

* IEEE 802.3af/at/bt Powered Device (PD) with Forward/Flyback Controller

* Supports Up to 71.3W PDs

* 5-Event Classification Sensing

* Superior Surge Protection (100V Absolute Maximum)

* Wide Junction Temperature Range (–40°C to 125°C)

* >94% End-to-End Efficiency with LT4321 Ideal Bridge