LT4275BIDD#TRPBF

Overview

The LT4275BIDD#TRPBF is a Powered Device (PD) controller supporting IEEE 802.3at (PoE+) and LTPoE++ standards, delivering up to 25.5W. It operates within a 9V to 60V input voltage range and features an integrated charge pump for N-channel MOSFET drive. The device includes board-attached signature resistors, UVLO, thermal protection, and a power-good output. Packaged in a 10-lead DFN (3mm x 3mm) with exposed pad, it supports auxiliary power inputs.

Feature Summary

• Supports IEEE 802.3at PoE+ and proprietary LTPoE++ classification schemes
• Integrates charge pump to drive external N-channel MOSFETs for low loss
• Includes on-board signature resistor and programmable auxiliary power support

Applications

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

Procurement Notes

Verify the specific suffix TRPBF indicates tape and reel packaging when sourcing. Confirm RoHS compliance status through official documentation. Ensure the supplier provides valid traceability records. Cross-reference the manufacturer part number against current Analog Devices catalogs to confirm active status and availability constraints prior to finalizing procurement orders.

Selection Notes

Select this component for applications requiring strict adherence to IEEE 802.3at standards or LTPoE++ protocols. The internal charge pump eliminates the need for P-channel MOSFETs, simplifying thermal design. Consider the 3mm x 3mm DFN package for space-constrained layouts. Verify that the external circuitry supports the required 9V to 60V operating range and auxiliary input configurations.

Part Context

This part belongs to the LT4275 family of pin-compatible PD controllers. While the LT4275A variant supports higher LTPoE++ power levels up to 90W, the LT4275B is specifically optimized for Type 2 (PoE+) applications up to 25.5W. All variants share identical pinouts and core control logic, allowing for flexible design scaling across different power requirements.

Replacement Considerations

LT4275BIDD#PBF is the tube-packaged equivalent of this component. LT4275AHMS is a leaded alternative within the same functional family. These parts maintain pin compatibility but differ in packaging format and potentially handling characteristics.