LTC4274AIUHF-4#PBF

Overview

The LTC4274AIUHF-4#PBF is a single-channel Power Sourcing Equipment (PSE) controller from Analog Devices, designed for high-power Ethernet applications. It supports IEEE 802.3at (PoE+) and IEEE 802.3af standards, delivering up to 90W of LTPoE++ power. The device operates within a supply voltage range of 45V to 57V and features an I2C interface for configuration. Packaged in a 38-pin QFN with an exposed pad, it functions as a complete PSE solution including detection, classification, and power delivery control.

Feature Summary

• Supports LTPoE++ technology for delivering up to 90W of power to compatible devices
• Integrates high-reliability four-point Powered Device (PD) detection mechanism
• Provides comprehensive protection against overcurrent, overtemperature, and short circuits
• Features low quiescent current operation to minimize standby power consumption

Applications

• High-power PoE+ network switches and hubs
• LTPoE++ powered access points and cameras
• Industrial IoT edge computing nodes requiring elevated power budgets
• Smart building infrastructure controllers

Procurement Notes

Verify the specific suffix (#PBF vs #TRPBF) to confirm tape-and-reel versus tube packaging requirements. Ensure the design supports the 38-WFQFN exposed pad thermal dissipation needs. Confirm I2C address settings align with system bus topology. Validate that the host microcontroller supports the required communication protocol for PSE configuration and monitoring.

Selection Notes

Select this component when a single channel requires LTPoE++ capability exceeding standard PoE+ limits. It is suitable for designs needing integrated PD detection and classification without external discrete logic. Consider the 38-QFN package size for space-constrained PCB layouts. Ensure the input power supply can maintain stability within the 45V to 57V operating range during transient load conditions.

Part Context

This part belongs to the LTC4274 family of PSE controllers, which are engineered for modern Ethernet infrastructure. Unlike earlier generations, this variant explicitly supports the LTPoE++ standard, allowing higher power delivery over existing cabling. It complements other PoE solutions by offering a compact, single-channel alternative to multi-channel controllers for specialized high-power endpoints.

Replacement Considerations

Public confirmed substitute part numbers: LTC4274AIUHF-1#PBF, LTC4274AIUHF-2#PBF, LTC4274AIUHF-3#PBF.