LTC4279IUFD#PBF

Overview

The LTC4279IUFD#PBF is a single-port Power Sourcing Equipment (PSE) controller designed for IEEE 802.3at Type 1, Type 2, and LTPoE++ compliant Power over Ethernet systems. It operates with an input voltage range of 45V to 57V and supports output power up to 123W. The device integrates autonomous classification and detection capabilities, simplifying implementation by requiring only a small number of passive support components. Packaged in a 20-lead QFN (4mm x 5mm) format, it facilitates efficient thermal management and compact board design for high-power PoE applications.

Feature Summary

• Autonomous single-port PSE controller supporting IEEE 802.3at and LTPoE++ standards
• Integrated classification and detection logic for simplified system implementation
• Designed for high-output power applications up to 123W
• Requires minimal external passive components for operation

Applications

• IEEE 802.3at Type 1 PoE systems
• IEEE 802.3at Type 2 PoE systems
• LTPoE++ compliant Power over Ethernet implementations

Procurement Notes

Verify the specific suffix #PBF indicates tube packaging when sourcing. Confirm that the component meets RoHS compliance requirements for your region. Ensure the supply chain provides genuine Analog Devices products to avoid counterfeit risks. Check current availability status as distribution may vary by region.

Selection Notes

Select this controller for designs requiring high power delivery per port without complex host interface integration. It is suitable for standalone PSE ports where autonomous operation is preferred. Consider the 20-QFN package for space-constrained layouts requiring effective heat dissipation.

Part Context

This component belongs to the LTC4279 series of PoE controllers. It serves as the active switching element in PSE circuits, managing power delivery to connected Powered Devices. Evaluation boards like the DC2541A are available to assist in verifying circuit performance before final production.

Replacement Considerations

The LTC4279IS#PBF is a direct alternative offering similar functionality in a 16-lead SOIC package. Verify pin compatibility and thermal performance differences when substituting between the QFN and SOIC packages.