LT4276CIUFD#PBF

Overview

The LT4276CIUFD#PBF is a Powered Device (PD) controller supporting IEEE 802.3at PoE+ and LTPoE++ standards. It integrates an isolated switching regulator controller for forward and flyback topologies with auxiliary power support. Input voltage ranges from 37V to 57V. Output capabilities include 12V at 7A (90W) in forward mode, or 5V at 7A (38.7W) and 5V at 4.7A (25.5W) in flyback mode. Efficiency reaches 94%. The device operates within a temperature range of -40°C to +125°C.

Feature Summary

• Supports IEEE 802.3af/at PoE and LTPoE++ protocols
• Integrates isolated DC-DC controller for synchronous forward and flyback topologies
• Enables auxiliary power input for enhanced operational flexibility

Applications

• 90W LTPoE++ power supplies in forward topology
• 38.7W LTPoE++ power supplies in flyback topology
• 25.5W Type 2 PoE+ power supplies in flyback topology

Procurement Notes

Verify the suffix #PBF indicates lead-free compliance and tube packaging. Confirm the CIUFD designation matches the required operating temperature range and package dimensions. Ensure the specific output configuration aligns with the intended application circuit design.

Selection Notes

Select this component for designs requiring high-power PoE+ or LTPoE++ integration. Choose based on the need for integrated isolation control in forward or flyback converters. Consider auxiliary power requirements if standard PD power is insufficient for peak loads.

Part Context

Part of the LT4276 family of pin-compatible PD controllers. Designed for Ethernet-powered devices requiring robust power management. Supports advanced LTPoE++ features alongside traditional PoE standards. Manufactured by Analog Devices Inc. for industrial and commercial applications.

Replacement Considerations

LT4276BIUFD#PBF supports 25.5W PoE+ flyback outputs. LT4276AHUFD#TRPBF offers tape-and-reel packaging options. Verify pin compatibility and thermal performance when substituting.