LTC4274CUHF#PBF

Overview

The LTC4274CUHF#PBF is a single-channel Power over Ethernet (PoE) Powered Device (PD) controller compliant with IEEE 802.3at and LTPoE++ standards. It operates within a supply voltage range of 41V to 57V and supports a maximum output power of 38.7W. The device utilizes an I2C interface for configuration and monitoring. It is housed in a 38-pin QFN package with an exposed pad, designed for industrial temperature ranges from -40°C to +85°C.

Feature Summary

• Supports LTPoE++ bidirectional power delivery alongside standard PoE+ operation
• Integrates synchronous rectification for high-efficiency power conversion
• Features programmable current limit and soft-start capabilities
• Provides comprehensive fault protection including overvoltage and thermal shutdown

Applications

• Industrial IoT edge devices requiring high-power connectivity
• Wireless access points supporting advanced PoE standards
• Security cameras with enhanced power requirements
• Digital signage displays utilizing LTPoE++ infrastructure

Procurement Notes

Verify the specific suffix '#PBF' indicates lead-free tape-and-tube packaging when ordering. Confirm that the 'C' grade designation matches the required industrial temperature range specifications for your application environment. Ensure compatibility with the host system's I2C addressing and voltage levels before integration.

Selection Notes

Select this component when designing systems requiring LTPoE++ support or high-efficiency PoE+ reception. Compare against the LTC4274AIHF variant if extended commercial temperature ranges are sufficient. Consider the 38-pin QFN footprint constraints during PCB layout planning to ensure adequate thermal dissipation for the exposed pad connection.

Part Context

This controller belongs to Analog Devices' family of PoE PD management solutions. It complements PSE controllers like the LTC4274A by providing the receiving end functionality. The part integrates control logic with power switches, reducing external component count compared to discrete solutions while maintaining compliance with evolving IEEE standards.

Replacement Considerations

The LTC4274AIHF-1#PBF serves as a direct functional replacement with identical pinout and electrical characteristics, differing primarily in temperature grade and suffix variations. Verify package compatibility and reflow profile requirements when substituting.