LT4275AIDD#TRPBF

Overview

The LT4275AIDD#TRPBF is a Powered Device (PD) controller supporting IEEE 802.3af, 802.3at, and LTPoE++ standards. It operates within a supply voltage range of 23V to 60V and delivers up to 90W of output power. The device features a maximum operating current of 2mA and functions across temperatures from -40°C to +85°C. Packaged in a 10-WFDFN (3x3mm) surface-mount format with an exposed pad, it utilizes an external N-channel MOSFET driven by an internal charge pump.

Feature Summary

• Supports proprietary LTPoE++ classification for high-power delivery alongside standard IEEE 802.3af/at compliance
• Integrates a charge pump to drive external N-channel MOSFETs, eliminating the need for larger P-channel solutions
• Includes board-embedded signature resistors and programmable auxiliary power input support

Applications

• High-power wireless data systems
• Outdoor security camera equipment
• Commercial and public information displays
• High-temperature industrial applications

Procurement Notes

Verify the specific suffix TRPBF indicates tape-and-reel packaging when sourcing components. Confirm that the DFN-10 package variant matches the required PCB footprint dimensions. Ensure the application environment remains within the specified -40°C to +85°C operational temperature limits. Check for any recent Product Change Notices regarding bond wire material updates or assembly source changes before finalizing procurement orders.

Selection Notes

Select this component when designing Powered Devices requiring up to 90W via LTPoE++ or standard PoE+ interfaces. The integrated charge pump architecture simplifies thermal management compared to P-channel alternatives. Verify compatibility with the target Power Sourcing Equipment's classification protocol. Consider the auxiliary power pin functionality if low-voltage operation or secondary power sources are required for system redundancy.

Part Context

This part belongs to the LT4275 family of pin-compatible controllers. While the LT4275B supports Type 2 (PoE+) and LT4275C supports Type 1 (PoE), the LT4275A variant specifically enables higher power levels through LTPoE++. All variants share the same physical footprint and control logic, differing primarily in their supported classification thresholds and maximum power delivery capabilities defined by the manufacturer.

Replacement Considerations

LT4275AIDD#PBF