LT4275AIMS#PBF

Overview

The LT4275AIMS#PBF is a Powered Device (PD) controller from Analog Devices Inc., designed for high-power Ethernet applications. It supports LTPoE++ classification schemes delivering up to 90W, IEEE 802.3at Type 2 (25.5W), and IEEE 802.3af Type 1 (13W). The device utilizes an internal charge pump to drive an external N-channel MOSFET, eliminating the need for larger P-channel alternatives. It features a 8-lead MSOP package with exposed pad.

Feature Summary

• Supports proprietary LTPoE++ classification for power levels up to 90W alongside standard IEEE 802.3af/at compliance
• Integrates a charge pump to drive external N-channel MOSFETs for optimized efficiency and thermal performance
• Includes onboard signature resistors and programmable auxiliary power support via the AUX pin

Applications

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

Procurement Notes

Verify the specific suffix IMS#PBF confirms the MSOP-8 package and lead-free status. Confirm the component is sourced from authorized distributors to ensure authenticity. Check current availability as supply constraints may affect procurement timelines for this specific package variant.

Selection Notes

Select this controller when designing PDs requiring power delivery exceeding standard PoE limits but compatible with existing infrastructure. It is suitable for applications needing precise power classification and efficient thermal management through external N-channel MOSFET integration.

Part Context

This component belongs to the LT4275 family of pin-compatible PD controllers. Variants include LT4275B for standard PoE+ and LT4275C for basic PoE. The LT4275A series specifically enables higher power classifications through proprietary signaling protocols while maintaining backward compatibility.

Replacement Considerations

Direct substitute: DC2093A-C (Evaluation Board). For functional IC replacement, consider other LT4275 variants based on required power class.