LTC4270BIUKG#TRPBF

Overview

The LTC4270BIUKG#TRPBF is a Power over Ethernet (PoE) controller designed for use as a Powered Device (PD). It complies with the IEEE 802.3at standard and supports up to 25.5W of power delivery. The device integrates a synchronous flyback converter controller, allowing for high-efficiency power conversion without requiring an optocoupler. It operates within a supply voltage range of 3V to 3.6V and functions reliably across an industrial temperature range from -40°C to +85°C. The component is housed in a compact 40-lead QFN package.

Feature Summary

• Integrates synchronous flyback controller for isolated power conversion
• Supports IEEE 802.3at PoE Powered Device applications
• Eliminates need for optocouplers via synchronized control architecture
• Provides comprehensive protection against reverse polarity and overvoltage conditions

Applications

• Industrial networking equipment requiring isolated power supplies
• Wireless access points and IP cameras supporting PoE++ standards
• Medical imaging devices needing compliant PoE input stages
• Automotive infotainment systems utilizing Ethernet connectivity

Procurement Notes

Verify the specific suffix 'I' or 'C' for temperature grade requirements before ordering. Confirm package availability as lead times may vary by region. Ensure design compatibility with external passive components specified in the official datasheet. Check for recent production change notices affecting pinout or electrical characteristics.

Selection Notes

Select this component when designing isolated PoE PDs requiring high efficiency and minimal component count. Compare against non-isolated alternatives if system topology permits direct connection. Evaluate thermal performance based on expected load currents and ambient conditions. Ensure external transformer selection matches the integrated controller's timing specifications.

Part Context

This part belongs to the Analog Devices LTC4270 family of PoE controllers. It serves as a bridge between Ethernet data lines and internal DC-DC conversion stages. The series is widely adopted in infrastructure equipment where reliable power delivery over twisted pair cables is critical. It complements other PoE management ICs in complete system solutions.

FAQ

Does the LTC4270BIUKG support daisy-chaining multiple powered devices?

No, the LTC4270 is designed as a standalone Powered Device controller and does not natively support daisy-chaining topologies.

What is the maximum power output supported by this controller?

The controller supports up to 25.5W of power delivery in compliance with the IEEE 802.3at standard.