LT4276BIUFD#PBF

LT4276 is a pin-for-pin compatible family of IEEE802.3 and LTPoE++ powered device (PD) controller. It includes an isolated switching regulator controller capable of synchronous operation in both forward and flyback topologies with auxiliary power support. This device supports both forward and flyback power supply topologies, configurable for a wide range of PoE applications. The flyback topology supports No-Opto feedback. Auxiliary input voltage can be accurately sensed with just a resistor divider connected to the AUX pin. This device utilizes an external, low RDS(ON) N-channel MOSFET for the Hot Swap function, maximizing power delivery and efficiency, reducing heat dissipation, and easing the thermal design. It is widely used in application such as high power wireless data systems, outdoor security camera equipment, commercial and public information displays, high temperature applications etc.

• Auxiliary power support as low as 9V
• No opto-isolator required for flyback operation
• External Hot Swap™ N-channel MOSFET for lowest power dissipation and highest system efficiency
• <gt/>94% end-to-end efficiency with LT4321 ideal bridge
• LTPoE++ 38.7W, 52.7W, 70W and 90W
• IEEE 802.3at 25.5W compliant
• IEEE 802.3af upto 13W compliant
• Operating temperature is -40°C to 85°C, IEEE 802.3at/af compliant
• Packaging style is 28-lead plastic QFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party