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Power MOSFETs with TurboFET deliver fast switching

Posted: 05 Dec 2008 ?? ?Print Version ?Bookmark and Share

Keywords:power MOSFET? fast switching? low gate charge?

Vishay TurboFET MOSFET

Vishay Intertechnology Inc. has expanded its family of Gen III TrenchFET power MOSFETs with the release of two 20V and two 30V n-channel devices that are the first to offer TurboFET technology. The TurboFET utilizes a new charge balanced drain structure to lower the gate charge by up to 45 percent, enabling significantly lower switching losses and faster switching.

The 20V SiS426DN device offers what is touted to be lowest on-resistance times gate charge for a device with this voltage rating in the 3mm x 3mm PowerPAK 1212-8 footprint. This key figure of merit (FOM) for MOSFETs in DC/DC converters is 76.6m?-nC at 4.5V and 117.60m?-nC at 10V for the SiS426DN, which features a low typical gate charge of 13.2nC at a 4.5V gate drive and 28nC at a 10V gate drive.

Compared to the closest competing devices, these specifications represent a reduction in gate charge of 45 percent at 4.5V and 36 percent at 10V, and a 50 percent lower FOM. Lower gate charge translates into more efficient switching at all frequencies, and in particular gives the designer the option to operate at higher frequencies, which enables the use of smaller passive components in DC/DC converters.

Vishay's 30V TurboFET offering includes the new Si7718DN in the PowerPAK 1212-8, and the Si7784DP in the PowerPAK SO-8. Both MOSFETs offer typical gate charge of 13.7nC at 4.5V and 30nC at 10V, and on-resistance times gate charge FOMs of 112.34m?-nC at 4.5 V and 180 m?-nC at 10 V. A PowerPAK SO-8 version of the 20-V SiS426DN device, the SiR496DP, is also available for high-current applications. All devices released today are halogen-free and 100 percent Rg and UIS tested.

The devices will be used as the high-side MOSFET in synchronous buck converters, helping to save power in notebook computers, voltage regulator modules, servers and other systems using point-of-load power conversion.

Samples and production quantities of the new Gen III power MOSFETs with TurboFET technology are available now, with lead times of 10 to 12 weeks for large orders.

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