LTC4266AIUHF-3#PBF

Overview

The LTC4266AIUHF-3#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 37.5V to 57V and delivers up to 30W per port. The device integrates high-side current sensing, precise voltage regulation, and comprehensive protection features including overvoltage, overcurrent, and thermal shutdown. It utilizes an I2C interface for configuration and monitoring, enabling flexible deployment in enterprise networking infrastructure.

Feature Summary

• Integrates four independent PoE+ power channels within a single compact package
• Supports dynamic power management through I2C digital control interface
• Includes built-in diagnostic capabilities for real-time system monitoring
• Provides robust protection mechanisms against electrical faults and thermal stress

Applications

• Enterprise-grade Ethernet switches and routers
• Wireless access point power distribution units
• Industrial automation network controllers
• PoE midspan injectors and extenders

Procurement Notes

Verify the specific suffix '3' indicates the fixed output voltage setting during procurement. Confirm RoHS compliance status via official documentation. Ensure compatibility with existing PCB layout requirements for the QFN-48 package. Validate supply chain authenticity through authorized Analog Devices distributors only.

Selection Notes

Select this component when designing systems requiring four isolated PoE+ outputs with centralized digital control. Consider the thermal performance characteristics relative to the expected ambient operating conditions. Evaluate the I2C bus speed requirements against the host microcontroller capabilities. Compare pinout compatibility if replacing legacy PSE solutions in existing designs.

Part Context

This part belongs to the LTC4266 family of quad PSE controllers from Analog Devices. It is specifically engineered for high-density power delivery in modern Ethernet infrastructure. The device represents a significant advancement in integrated PoE management, offering superior efficiency compared to discrete solutions. It serves as a core component for next-generation networking hardware.

Replacement Considerations

Direct replacements include other variants within the LTC4266 series such as the LTC4266AIUHF-1 or LTC4266AIUHF-2, depending on required output voltage settings. Cross-referencing with the LTC4291 chipset may be necessary for higher power IEEE 802.3bt applications. Verify pin-to-pin compatibility before substituting any alternative components.