LTC4266CUHF#PBF

Overview

The LTC4266CUHF#PBF is a quad Power Sourcing Equipment (PSE) controller designed for IEEE 802.3at and 802.3af applications. It operates within an input voltage range of 44V to 57V, supporting up to four independent PoE ports. The device integrates a 14-bit current monitoring ADC and features I2C serial control interface compatibility. Packaged in a 38-lead QFN format, it provides comprehensive port management capabilities including detection, classification, and power delivery control.

Feature Summary

• Integrates a 14-bit analog-to-digital converter for precise current monitoring across all channels
• Supports proprietary dual-mode detection mechanisms to ensure reliable Powered Device identification
• Features versatile quick port shutdown functionality for advanced power management
• Includes DAC-programmable current limits to protect against overcurrent conditions

Applications

• High-density Ethernet switch designs requiring multiple PoE ports
• Power sourcing equipment systems compliant with IEEE 802.3at standards
• Network infrastructure hardware needing centralized port management via I2C
• Industrial networking applications requiring robust powered device detection

Procurement Notes

Verify the specific suffix and package marking against official Analog Devices documentation to confirm the exact grade and thermal performance characteristics. Ensure that the procurement channel provides traceability for RoHS compliance status. Cross-reference the ordering part number with the manufacturer's latest datasheet to validate availability and any potential supply chain restrictions or obsolescence notices before finalizing orders.

Selection Notes

Select this component when designing systems requiring simultaneous control of multiple PoE ports with high accuracy current sensing. The integrated ADC and I2C interface make it suitable for smart network switches where real-time power monitoring is required. Consider the QFN package size and thermal requirements relative to the PCB layout constraints. Evaluate the need for proprietary detection immunity if operating in electrically noisy environments.

Part Context

This component belongs to the LTC4266 family of PSE controllers from Analog Devices. It serves as a central management unit for powering remote devices over Ethernet cabling. The series is designed to replace discrete solutions by integrating control logic, protection circuits, and monitoring functions into a single compact package, simplifying board design and reducing overall system footprint.

Replacement Considerations

Consult official Analog Devices substitution guides for verified alternatives. Generic cross-references may not match the proprietary detection algorithms or I2C timing specifications.