Linear Technology LT4295IUFD#TRPBF

Description
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 Ros(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.

Features
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
External Hot Swap N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
No-Opto Flyback Operation
Auxiliary Power Support as Low as 9V
Easy Migration of LTPOE PDS to IEEE 802.3bt PDs
Pin Compatible with LT4276A/B/C
28-Lead 4mm x 5mm QFN Package

Applications
High Power Wireless Data Systems
Outdoor Security Camera Equipment
Commercial and Public Information Displays
High Temperature Applications