LTC4278IDKD

Overview

The LTC4278IDKD is a Powered Device (PD) controller compliant with the IEEE 802.3at standard for Power over Ethernet applications. It integrates a high-voltage power switch and a synchronous flyback controller, enabling isolated power supply generation without requiring an optocoupler. The device operates in a Surface-Mount Device Package (DFN-32). It supports Class 4 power classification and includes features for precise voltage regulation and protection mechanisms suitable for PoE LAN interfaces.

Feature Summary

• Integrates a synchronous flyback controller to generate isolated power supplies directly from the PoE input.
• Eliminates the need for optocouplers in the feedback loop through proprietary control architecture.
• Supports IEEE 802.3at Class 4 powered device classifications for high-power applications.
• Includes integrated high-voltage power switch for direct connection to Ethernet lines.

Applications

• IEEE 802.3at Powered Devices requiring isolated power rails
• PoE-powered network infrastructure equipment
• Industrial IoT nodes with isolated communication requirements

Procurement Notes

Verify the specific suffix against the manufacturer's official documentation to confirm package type and temperature range. Ensure compatibility with the target IEEE 802.3at implementation. Confirm RoHS compliance status via the current datasheet revision. Validate that the DFN-32 footprint matches the PCB design constraints.

Selection Notes

Select this component when designing PoE systems that require galvanic isolation without the complexity of optocoupler-based feedback loops. It is suitable for applications needing Class 4 power levels. Consider thermal management requirements associated with the DFN-32 package during layout. Verify input voltage ranges align with the PoE source specifications.

Part Context

This part belongs to the Analog Devices LTC4278 series of PoE controllers. It is designed to simplify the design of isolated power supplies for network devices by combining switching regulation and power path management in a single IC.

FAQ

Does the LTC4278IDKD support non-standard PoE signatures?

The device is designed for IEEE 802.3at compliance. Support for non-standard signatures depends on specific configuration and external circuitry as defined in the datasheet.

What is the maximum power class supported?

The LTC4278 supports IEEE 802.3at Class 4 powered devices.