LT4276CHUFD#TRPBF

Overview

The LT4276CHUFD#TRPBF is a Powered Device (PD) controller from Analog Devices, compliant with IEEE 802.3 and LTPoE++ standards. It integrates an isolated switching regulator controller supporting synchronous operation in forward and flyback topologies with auxiliary power support. The component handles input voltages from 37V to 57V. In a typical 70W LTPoE++ application using forward topology, it delivers 5V at 13A output with 94% efficiency. It operates within a temperature range of -40°C to 125°C and is housed in a 28-WFQFN package.

Feature Summary

• Supports LTPoE++ and IEEE 802.3af/at Powered Device classifications
• Integrates isolated switching regulator controller for forward and flyback topologies
• Enables auxiliary power support for enhanced system reliability
• Provides pin-for-pin compatibility across the LT4276 family

Applications

• 70W LTPoE++ powered device power supplies
• Forward topology DC-DC conversion for Ethernet-powered equipment
• Auxiliary power supply integration in PoE systems
• High-efficiency isolated power regulation for network devices

Procurement Notes

Verify the specific suffix TRPBF indicates tape and reel packaging when sourcing. Confirm that the CH variant corresponds to the higher power capability required for 70W applications compared to lower-power family members. Ensure the supplier provides official documentation confirming compliance with LTPoE++ standards. Check for any recent product change notices regarding assembly or material declarations before finalizing procurement.

Selection Notes

Select this component for designs requiring high-power LTPoE++ delivery up to 70W. Choose the CH variant specifically for applications needing the performance characteristics associated with higher wattage outputs. Consider the forward topology requirement if designing for the 5V/13A use case. Evaluate thermal management needs given the 125°C maximum operating temperature and the dense 28-QFN package footprint.

Part Context

This part belongs to the LT4276 family of PD controllers designed for Power over Ethernet applications. The family supports both standard PoE+ and the newer LTPoE++ specifications. The LT4276 series allows designers to implement flexible power architectures by supporting multiple converter topologies. This specific model targets high-density network infrastructure where significant power delivery is necessary.

Replacement Considerations

LT4276AHUFD#TRPBF: Lower power variant (38.7W). LT4276BIUFD#TRPBF: Lower power variant (25.5W). LT4276AIUFD#TRPBF: Lower power variant (25.5W). LT4276CUFD#TRPBF: Similar power class but verify specific suffix differences.