LTC4274AIUHF-4#TRPBF

Overview

The LTC4274AIUHF-4 is a single-port Power Sourcing Equipment (PSE) controller designed for IEEE 802.3at (PoE+) and LTPoE++ compliant systems. It supports up to 90W output power with an operating voltage range of 45V to 57V. The device features I2C interface control, operates within a temperature range of -40°C to 85°C, and utilizes a 38-pin QFN package.

Feature Summary

• Supports proprietary LTPoE++ detection and classification schemes for mutual identification between PSE and PD while maintaining backward compatibility with Type 1 and Type 2 devices.
• Enables high-power delivery up to 90W through external MOSFET integration, reducing channel resistance and eliminating the need for heatsinks at standard power levels.
• Provides advanced power management capabilities including programmable current limit and cut thresholds, along with real-time current and voltage readback via I2C.

Applications

• LTPoE++ powered network infrastructure equipment
• High-power PoE+ midspan injectors
• Enterprise switch ports requiring extended power budgets

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm pinout and functional configuration. Ensure the selected variant matches the required packaging format for your assembly process. Cross-reference the part number with the latest datasheet revision to validate all electrical specifications before finalizing procurement.

Selection Notes

Select this component when designing systems requiring power delivery beyond standard PoE+ limits while maintaining IEEE compliance. Consider the thermal management requirements associated with external MOSFET selection. Evaluate the I2C interface complexity if software-based control is preferred over standalone operation modes.

Part Context

This controller belongs to the LTC4274 family, which serves as a foundational solution for Ethernet-powered applications. It represents an evolution in PSE technology by integrating support for higher power classes without compromising interoperability with legacy powered devices in existing network cabling infrastructures.

Replacement Considerations

The LTC4274A-4#TRPBF is a confirmed substitute offering identical functionality within the same product family. Verify that any alternative components maintain compatibility with the specific LTPoE++ protocol requirements defined by the original design specifications.