The LTC4268-1 is a solution that integrates a high-power PD interface control with an isolated flyback controller, suitable for high-power 2-pair PoE applications. It provides the same 25k signature detection resistance as standard PoE, and has low inrush current limit and high input current limit.
The document introduces the LTC4268-1, a highly integrated solution that combines a Power over Ethernet (PoE) PD interface with an isolated synchronous flyback controller. This integration allows for delivering up to 35W of power to devices without requiring large external wall adapters.
The note details circuit topologies for both standard 2-pair and high-performance 4-pair PoE systems. It highlights the benefits of using the LTC4268-1 in a triple-output configuration, noting efficiencies over 83% when powered by a PSE and exceeding 85% with an auxiliary supply.
The device allows for power delivery of up to 35W for high-power 2-pair PoE applications.
No, the small supply utilizes an isolated flyback topology that requires no optoisolator.