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Synchronous rectifier ups efficiency in power designs

Posted: 31 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous rectifier? switching designs? DC/DC power?

Fairchild Semiconductor has rolled out a 40V breakdown DC/DC synchronous rectifier that it says enables designers to achieve higher levels of efficiency in their power designs. This device is suitable for power supplies such as DC/DC brick modules and servers where the highest efficiency and the smallest footprint are critical features.

The FDMS8460 promises world-class Rds(on) and total gate charge (QG), and provides 20 percent lower figure of merit (FOM) compared to other 40V MOSFET solutions. Packaged in an industry-standard and green 5mm x 6mm MLP package, this DC/DC synchronous rectifier provides designers the necessary performance and packaging to optimize their designs.

The company's advanced performance PowerTrench MOSFET process technology enables higher output power levels without increasing the solution footprint. PowerTrench technology produces low values for Miller charge (QGD), Rds(on) and QG, and improves the gate-source charge to gate-drain charge (QGS:QGD) ratio to above one. All these enhancements result in superior switching performance, the company said, avoiding shoot-through and improving thermal efficiencies.

The FDMS8460's ultralow Rds(on) of 2.2m max and extremely low QGD of 10nC allows conduction losses and switching losses to be drastically reduced. This increases the drain current through the device to improve efficiency and to reduce heat (conduction loss), an important consideration in today's power systems. Its 40V MOSFET rating is essential for the 5V and the 12V output rail voltages typically required in today's DC/DC applications.

The FDMS8460 uses Pb-free terminals and has been characterized for moisture sensitivity in accordance with the Pb-free reflow requirements of the joint IPC/Jedec standard J-STD-020. All of Fairchild's products are designed to meet the requirements of the RoHS directive.

Pricing is 85 cents each in 1,000 quantities. Samples are available. Delivery is eight to 10 weeks ARO.





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