Linear Technology LTC4269 PoE+ PD Controller Application Note

About this manual

The document introduces the Linear Technology LTC4269-1 and LTC4269-2 integrated PD controller ICs designed to meet the requirements of the IEEE 802.3at (PoE+) standard, which supports up to 25.5W power delivery. These devices integrate front-end PD control with high-performance DC/DC controllers for either synchronous flyback or forward converter topologies.

What's inside

• Introduction
• Design Features
• LTC4269-1 Synchronous Flyback
• LTC4269-2 Synchronous Forward
• Efficiency Comparison

Frequently asked questions

What is the maximum power output supported by the PoE+ standard described?

The IEEE 802.3at standard raises the available PD power to 25.5W.

What is the maximum output current for the LTC4269-1 based synchronous flyback converter?

The circuit is capable of a 5V output voltage at 5A.

What is the efficiency of the LTC4269-2 based synchronous forward supply?

The LTC4269-2 solution achieves an efficiency of 92.5%.