Datasheet Linear Technology LT4295HUFD#PBF

LT4295
IEEE 802.3bt PD Interface
with Forward/Flyback Controller
Features Description IEEE 802.3af/at/bt(Draft 2.0) Powered Device (PD) with Forward/Flyback Controller
n Supports Up to 71 Watt PDs
n 5-Event Classification Sensing
n Superior Surge Protection (100V Absolute Maximum)
n Wide Junction Temperature Range (–40°C to 125°C)
n >94% End-to-End Efficiency with LT4321 Ideal Bridge
n External Hot Swap N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
n No-Opto Flyback Operatio Auxiliary Power Support as Low as 9V
n Easy Migration of LTPoE++В® PDs to IEEE 802.3bt PDs
n Pin Compatible with LT4276A/B/C
n 28-Lead 4mm Г— 5mm QFN Package The LTВ®4295 is an IEEE 802.3af/at/bt(Draft 2.0)-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. n Applications n n 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 …