LTC4267IDHC#PBF

Overview

The LTC4267IDHC#PBF is a Power over Ethernet (PoE) Powered Device controller and switching regulator manufactured by Analog Devices Inc. It integrates an IEEE 802.3af-compliant PD interface with a current-mode switching regulator to simplify PoE implementation. The device operates within an input voltage range of -57V to -37V and provides regulated output voltages including 3.3V, 5V, and 12V. It features a 16-lead DFN package measuring 5 x 3 x 0.7mm, suitable for space-constrained designs.

Feature Summary

• Integrates IEEE 802.3af compliant Powered Device interface with internal signature resistor and classification capabilities
• Combines PD detection logic with a current-mode switching regulator for efficient power conversion
• Includes thermal overload protection and precise dual-level current limiting for robust operation
• Supports isolated and non-isolated configurations via onboard error amplifier and voltage reference

Applications

• IEEE 802.3af Powered Device implementations requiring compact form factors
• Network infrastructure equipment powered via Ethernet cabling
• Industrial control systems utilizing PoE for power delivery
• IoT devices requiring integrated PoE interface and DC-DC conversion

Procurement Notes

Verify the specific suffix IDHC confirms the DFN package and industrial temperature grade (-40°C to +85°C). Confirm RoHS compliance status through official documentation. Ensure compatibility with target output voltage requirements as the device supports multiple regulated outputs. Check for obsolescence notices or lifecycle changes directly from Analog Devices before finalizing procurement plans.

Selection Notes

Select this component when a single-chip solution for both PoE detection and regulation is required to minimize board space. The integrated design eliminates the need for external signature resistors and reduces component count compared to discrete solutions. Consider the DFN package constraints for thermal management and PCB layout. Verify that the input voltage range aligns with the standard PoE PSE output specifications.

Part Context

The LTC4267 belongs to Analog Devices' family of PoE controllers designed to simplify Powered Device development. It addresses the complexity of traditional two-IC approaches by combining interface and conversion functions. This integration reduces design time and physical footprint, making it suitable for modern networked devices where size and efficiency are critical parameters.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Evaluate alternative PoE controllers based on pin compatibility, electrical specifications, and package dimensions if substitution is necessary.