LTC4278IDKD-1

Overview

The LTC4278IDKD-1 is a Powered Device (PD) controller compliant with IEEE 802.3at standards, designed for high-power PoE applications. It integrates a synchronous no-opto flyback controller to drive an isolated secondary-side regulator directly from the PD input voltage. The device operates within a 37V to 57V input range and supports Class 4 power classification. Housed in a 32-lead DFN package, it provides comprehensive protection features including overvoltage, undervoltage, and thermal shutdown.

Feature Summary

• Integrates a synchronous no-opto flyback controller for direct drive of isolated secondary regulators
• Supports IEEE 802.3at Class 4 powered device classifications
• Provides comprehensive input protection against overvoltage, undervoltage, and reverse polarity conditions

Applications

• High-power PoE endpoints requiring isolated power supplies
• Industrial IoT devices with strict isolation requirements
• PoE-powered cameras and access points

Procurement Notes

Verify the specific suffix 'TRPBF' or '#PBF' when ordering, as these denote tape-and-reel versus tube packaging respectively. Confirm RoHS compliance status through official Analog Devices documentation. Ensure the design accounts for the DFN-32 thermal pad requirements for adequate heat dissipation during operation.

Selection Notes

Select this component for designs requiring integrated flyback control without external optocouplers. It is suitable for applications needing Class 4 power levels up to 30W. Consider the DFN-32 package size and thermal performance constraints when laying out the PCB. Verify compatibility with the intended transformer design for the synchronous rectification scheme.

Part Context

This part belongs to the LTC4278 family of PoE controllers. It is functionally similar to the LTC4269 series but includes integrated flyback control capabilities. The 'I' grade indicates an industrial temperature range specification. The '-1' suffix typically denotes specific pinout or feature variations within the family compared to base models.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.