LTC4266AIUHF-1#PBF

Overview

The LTC4266AIUHF-1#PBF is a quad Power Sourcing Equipment (PSE) controller designed for IEEE 802.3at PoE+ applications. It supports four independent ports with an input voltage range of 44V to 57V and delivers up to 25.5W per port. The device integrates high-side current sensing, precise voltage regulation, and comprehensive protection features including overcurrent, thermal shutdown, and cable drop compensation. It operates within a temperature range of -40°C to +85°C and utilizes a 6mm x 6mm QFN-40 package.

Feature Summary

• Integrates four independent PSE channels with integrated power switches
• Supports proprietary detection and classification schemes for IEEE 802.3at compliance
• Includes built-in cable drop compensation for accurate power delivery
• Features I2C interface for configuration and monitoring

Applications

• IEEE 802.3at PoE+ midspan injectors
• High-density PoE switch designs
• Network infrastructure power distribution units
• Access point power sourcing equipment

Procurement Notes

Verify the specific suffix '#PBF' indicates lead-free tin ball packaging compliant with RoHS standards. Confirm the 'AI' grade designation matches required industrial temperature specifications. Ensure ordering documentation aligns with Analog Devices official part numbering conventions to avoid substitution errors during procurement.

Selection Notes

Select this component when designing multi-port PoE+ systems requiring integrated switching and control. Consider the QFN-40 package size for PCB space constraints. Evaluate thermal management requirements given the high power density of four simultaneous 25.5W outputs. Verify compatibility with existing network magnetics and isolation requirements for the target application.

Part Context

This part belongs to the LTC4266 family of quad PSE controllers from Analog Devices. It serves as a core component for implementing IEEE 802.3at compliant power injection in network hardware. The device simplifies design by combining control logic, drivers, and protection circuits into a single integrated solution for high-port-count deployments.

Replacement Considerations

LTC4266IUHF-1#PBF offers similar functionality but may differ in temperature grade or packaging specifics. Verify electrical parameter equivalence and pinout compatibility before substituting. Consult official datasheets for detailed comparison of feature sets and operational limits.