Enhanced MOSFET technology delivers thermal, efficiency and size advantages

Fairchild has enhanced its GreenBridge active bridge quad MOSFET technology with FDMQ8205, the first member of its next-generation GreenBridge series for applications that receive power via Power Over Ethernet (POE), such as security cameras, wireless access points, LED lighting and other powered devices. Designers can lower operating temperature, increase efficiency and reduce the solution size of their devices by taking advantage of the solution’s best-in-class Rdson performance, extremely small form factor and superior thermal performance. The technology is compliant with the IEEE 802.3at standard and has up to 10 times lower power dissipation than Schottky diodes. This superior thermal performance allows designers to reduce or eliminate heat sinks to simplify their product design, decrease BOM costs and shrink PCB size. “Dealing with heat has always been a critical design challenge, but even more so with these new generations of IoT devices that require 25.5W or more. The leading edge MOSFET technology in our latest GreenBridge devices help designers eliminate excessive heat and achieve key system design goals, including higher efficiency, ensuring standards compliance and decreasing overall size and reducing costs,” said Suman Narayan, vice president of the intelligent power FET division at Fairchild. The extremely low conduction losses of the next-generation GreenBridge series are another important advantage as power and voltage must be maximised for the limited input power of POE systems. The series has excellent Rdson performance with 47 percent lower conduction losses compared to its closest competitor due to the power conversion efficiency of its optimised PowerTrench MOSFET technology. The small size of the devices also makes them ideal for new POE-based devices that need to be smaller than previous generations. At just 4.5mm x mm, the devices incorporate four MOSFETs in an MLP package connected in a full bridge. Further complementing their small size, they do not require an external driver, saving additional PCB space.