LTC4274CIUHF#PBF

Overview

The LTC4274CIUHF#PBF is a single Power Sourcing Equipment (PSE) controller designed for IEEE 802.3af (PoE) and 802.3at (PoE+) compliant systems. It supports up to 38.7W output power with an operating voltage range of 45V to 57V. The device utilizes a 38-pin QFN package and features I2C interface connectivity for programmability. It operates within a temperature range of -40°C to 85°C.

Feature Summary

• Supports IEEE 802.3af and 802.3at standards with proprietary detection and classification schemes
• Enables external MOSFET integration to minimize channel resistance and eliminate heatsink requirements
• Provides advanced power management including current/voltage readback and programmable thresholds
• Features 80V-rated port pins for robust protection against external faults

Applications

• Single-port PoE/PoE+ midspan injectors
• Power sourcing equipment in network switches
• Industrial Ethernet power distribution units

Procurement Notes

Verify the specific suffix '#PBF' indicates lead-free tape-and-reel or tube packaging as per manufacturer documentation. Confirm the 'C' grade designation matches the required commercial temperature range specifications. Ensure compatibility with external MOSFET selection for thermal management at maximum power levels.

Selection Notes

Select this component for applications requiring strict adherence to IEEE 802.3af/at standards with high reliability. The design allows for external power components to handle higher power dissipation without internal thermal constraints. Consider the I2C interface requirements for system software integration when evaluating control complexity.

Part Context

This part belongs to the LTC4274 family of PSE controllers from Analog Devices. It serves as a core power management solution for Ethernet infrastructure, enabling efficient power delivery over standard cabling while maintaining compliance with industry networking protocols.

Replacement Considerations

LTC4274AIUHF-1#PBF offers extended industrial temperature capabilities compared to the C-grade variant.