LT4276AHUFD#TRPBF

Overview

The LT4276AHUFD#TRPBF is a Powered Device (PD) controller supporting IEEE 802.3af, 802.3at, and LTPoE++ standards. It operates with an input voltage range of 37V to 57V and delivers up to 90W output power. The device integrates an isolated switching regulator controller capable of synchronous forward and flyback topologies with auxiliary power support. It functions within a supply voltage of 60V maximum and draws 2mA maximum supply current. The component is rated for operating temperatures from -40°C to 125°C and utilizes a 28-WFQFN package.

Feature Summary

• Supports IEEE 802.3af, 802.3at, and LTPoE++ Powered Device protocols
• Integrates isolated switching regulator controller for forward and flyback topologies
• Enables auxiliary power support for enhanced system flexibility
• Provides high efficiency DC-DC conversion capabilities

Applications

• LTPoE++ powered devices requiring up to 90W power delivery
• IEEE 802.3at PoE+ powered equipment
• Isolated power supplies utilizing auxiliary input sources
• Forward or flyback converter designs in network infrastructure

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing components. Confirm that the AHUFD designation corresponds to the required temperature grade and package variant. Ensure compatibility with the intended topology, whether forward or flyback, as the controller supports both configurations. Cross-reference the datasheet for pinout details and electrical characteristics relevant to the specific application design requirements.

Selection Notes

Select this controller for applications requiring compliance with LTPoE++ and standard PoE standards while needing integrated isolation control. It is suitable for designs demanding high power density up to 90W. Consider the thermal performance limits of the 28-QFN package when designing heat dissipation strategies. Evaluate the need for auxiliary power inputs if higher efficiency or specific voltage regulation is required beyond standard PoE constraints.

Part Context

This component belongs to the LT4276 family of pin-for-pin compatible PD controllers manufactured by Analog Devices. The series includes variants supporting different power levels and interface standards. The LT4276 architecture combines classification logic with an isolated DC-DC controller, simplifying the design of compliant powered devices compared to discrete solutions.

Replacement Considerations

LT4276BIUFD#PBF

FAQ

What power standards does the LT4276AHUFD support?

It supports IEEE 802.3af (PoE), 802.3at (PoE+), and LTPoE++ standards.

Can this controller be used in flyback topologies?

Yes, it includes an isolated switching regulator controller capable of synchronous operation in both forward and flyback topologies.