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Vishay ships power MOSFETs in PolarPAK package

Posted: 28 Dec 2005 ?? ?Print Version ?Bookmark and Share

Keywords:Vishay Intertechnology? power MOSFET? PolarPAK? SiE802DF? SiE800DF?

Vishay Intertechnology Inc. announced that it is shipping the first two power MOSFETs to be offered in its PolarPAK package, which uses double-sided cooling to reduce thermal resistance, package resistance and package inductance for a more efficient, faster switching power MOSFET.

The new PolarPAK package is said to be designed for easy handling and mounting onto the PCB with high-speed assembly equipment and thus to enable high assembly yields in mass-volume production. According to Vishay, PolarPAK is the first MOSFET package with double-sided cooling to be sourced by multiple manufacturers, beginning with a license agreement between Vishay and STMicroelectronics in March 2005.

Vishay's first power MOSFETs are the 30V n-channel SiE802DF and SiE800DF. Designed for the low-side control switch in synchronous rectification DC/DC converters, the SiE802DF offers on-resistance of 1.9 milliohms maximum at a 10V gate drive (2.6 milliohms maximum at 4.5V), and can handle current levels up to 60A. The SiE800DF, optimized to work as the low-duty-cycle high-side MOSFET in synchronous DC/DC converter designs, features a low typical gate charge Qg of 12 nC, with an on-resistance of 7.2 milliohms maximum at 10V and 11.5 milliohms at 4.5V.

The MOSFETs, which have the same footprint dimensions of the standard SO-8, dissipate 1C/W from their top surface and 1C/W from their bottom surface. The company explained that this provides a dual heat dissipation path which gives the devices twice the current density of the standard SO-8. With its improved junction-to-ambient thermal impedance, a PolarPAK power MOSFET is said to handle more power or operate with a lower junction temperature. A lower junction temperature means a lower rDS(on), which in turn means higher efficiency.

Typical applications for the new devices include voltage regulator modules in notebook and desktop PCs, and other systems requiring high-efficiency DC/DC conversion. The 5-by-6mm package also allows designers to create smaller, more compact circuit designs with a lower component count. With a height dimension of 0.8mm, the PolarPAK package is touted to enable end products that are thinner as well.

Samples and production quantities of the SiE800DF and SiE802DF are already available, with lead times of 10 to 12 weeks for larger orders.

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