LT4276BIUFD#PBF

Overview

The LT4276BIUFD#PBF is a Powered Device (PD) controller supporting IEEE 802.3af/at and LTPoE++ standards, housed in a 28-lead QFN package. It operates with a maximum supply voltage of 60 V and draws a typical operating current of 2 mA. The device supports output power up to 25.5 W for Type 2 PoE+ applications and handles input voltages between 37 V and 57 V. It functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrates an isolated switching regulator controller capable of synchronous operation in forward and flyback topologies
• Supports auxiliary power input for enhanced reliability during startup or fault conditions
• Provides pin-for-pin compatibility within the LT4276 family for design flexibility

Applications

• PoE+ powered devices requiring 25.5W output in flyback topology
• LTPoE++ powered devices utilizing forward or flyback converter topologies
• Network infrastructure equipment with auxiliary power support requirements

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified partners. Confirm RoHS compliance status via official documentation before integration. Check current availability as distribution may be limited or subject to factory order constraints. Ensure storage and handling procedures meet moisture sensitivity level requirements for the QFN package.

Selection Notes

Select this controller for designs requiring LTPoE++ and standard PoE/PoE+ compatibility with integrated isolation control. Consider the 28-QFN package for space-constrained layouts. Evaluate thermal performance for the specific application power level. Verify that the chosen topology aligns with the controller's synchronous switching capabilities.

Part Context

This component belongs to the LT4276 series of Ethernet Power Sourcing Equipment controllers designed for high-efficiency power delivery over data lines. It addresses the growing demand for higher power budgets in networked devices while maintaining compatibility with existing IEEE standards.

Replacement Considerations

LT4276AIUFD#PBF and LT4276BUFD#PBF are pin-compatible alternatives within the same family offering similar functional characteristics.