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Power solution improves light load efficiency

Posted: 28 Mar 2012     Print Version  Bookmark and Share

Keywords:MOSFET  DC/DC application  Ultrabook 

Fairchild Semiconductor International Inc. unveils the compact FDMF6708N Generation II XS DrMOS family, an integrated MOSFET plus driver power stage solution targeted at high-current, high-frequency, synchronous buck DC/DC applications.

The FDMF6708N Generation II XS DrMOS family is said to allow designers to cut inductor height in power supply designs applications such as Ultrabook devices and notebooks.


The FDMF6708N combines a driver IC and two power MOSFETs.

The FDMF6708N combines a driver IC, two power MOSFETs and a bootstrap Schottky diode into a thermally enhanced, 6 x 6mm PQFN Intel DrMOS v4.0 standard package. It provides designers a 50 per cent smaller footprint while delivering high-switching frequency and high power density, noted Fairchild. The device's Zero Cross Detect (ZCD) feature improves light load efficiency for extended battery life, added the company.

The device claims to provide high efficiency at full load using the latest control FET and SyncFET technology as well as clip-bond packaging with lower source inductance. Traditional discrete solutions require larger PCB space, longer layout traces, higher inductances and more components resulting in poor thermal performance at the higher frequencies required to enable lower profile magnetics, indicated Fairchild.

The device delivers 2.5 per cent better efficiency at peak load (15A) and six per cent better efficiency at full load (30A). It is suitable for applications requiring 600kHz to 1MHz switching frequency, even with a 20V input voltage. This enables designers to use smaller and thinner inductors and capacitors for reduced solution size, while meeting thermal requirements, the company said.

The device is available at Rs.92.08 ($1.86) in 1,000 quantity pieces with 8-12 weeks ARO. Samples are available upon request.

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