Active bridge improves PoE-based IoT performance

Enhancements to Fairchild Semiconductor’s GreenBridge active bridge, quad MOSFET technology have produced the FDMQ8205. It is the first member of a series for security cameras, wireless access points, LED lighting applications and any devices powered via PoE (power over Ethernet).

According to the company, designers can lower operating temperature, increase efficiency and reduce the size of devices by taking advantage of what is claimed to be best-in-class RDSON performance and small form factor.

The technology is compliant with the IEEE 802.3at standard and has up to 10 times lower power dissipation than Schottky diodes, says the company. Thermal performance allows designers to reduce or eliminate heatsinks to simplify the design, decrease bill of materials and shrink PCB size.

Low conduction losses are RDSON performance with 47% lower conduction losses compared to its closest competitor, claims the company, due to the power conversion efficiency of its optimised PowerTrench MOSFET technology.

At just 4.5 x 5mm, the devices incorporate four MOSFETs in an MLP package connected in a full bridge. PCB space is save by not requiring an external driver.


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