LTC4266AIUHF-2#PBF

Overview

The LTC4266AIUHF-2#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 37V to 57V and delivers up to 25.5W per port. The device integrates high-voltage MOSFETs, current sense amplifiers, and a precision analog-to-digital converter (ADC). Key electrical parameters include a quiescent supply current of 1.5mA and operation within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates four independent PoE+ PSE channels with built-in high-voltage MOSFETs
• Features proprietary detection and classification for reliable PD identification
• Includes integrated ADC for precise voltage and current monitoring
• Supports I2C interface for configuration and status reporting

Applications

• IEEE 802.3at compliant PoE+ midspan injectors
• High-density PoE switch power supplies
• Industrial network infrastructure equipment
• Outdoor access point power distribution systems

Procurement Notes

Verify the suffix #PBF indicates lead-free RoHS compliance. Confirm the AI grade specifies industrial temperature performance. Ensure the IUHF package matches your PCB footprint requirements. Cross-reference the manufacturer's latest datasheet for any pinout revisions or updated absolute maximum ratings before finalizing procurement specifications.

Selection Notes

Select this component for designs requiring four isolated PoE+ ports in a compact form factor. The integrated MOSFETs reduce external component count compared to discrete solutions. Consider thermal management capabilities when designing for continuous 25.5W output per channel. Verify I2C addressability if multiple controllers are used on the same bus.

Part Context

This part belongs to the LTC4266 family of quad PSE controllers from Analog Devices. It serves as a core power management IC for modern Ethernet switching infrastructure. The device simplifies design by combining control logic, protection circuits, and power switches into a single QFN package, replacing multi-component legacy architectures.

Replacement Considerations

LTC4266IUHF-2#PBF: Same function but commercial temperature grade instead of industrial.