MALVERN, PA -- (Marketwire) -- 08/10/09 -- Vishay Intertechnology, Inc. (NYSE: VSH) today
released the first of its monolithic MOSFET and Schottky SkyFET® products
to use the company's latest TrenchFET® technology. Using TrenchFET Gen
III silicon, the new Si4628DY delivers the lowest on-resistance ever for a
device of its type in the SO-8 package, with a maximum rDS(on) of 3
milliohms at a 10-V gate drive and 3.8 milliohms at 4.5 V.
The new Si4628DY SkyFET will typically be used as the low-side power MOSFET
in synchronous buck converters for notebook core voltage and VRM
applications, graphic cards, point-of-load power conversion, and
synchronous rectification in computers and servers. Its on-resistance times
gate charge figure of merit (FOM), a key indicator of performance in such
applications, is 26 % better at a 10-V gate drive and 34 % better at 4.5 V
than the next best device in the SO-8.
The Si4628DY is designed to improve power conversion efficiency at light
loads for both mains-powered servers and battery-operated notebooks. Under
light-load conditions, the MOSFET in power converters is off, and current
is conducting through the Schottky diode. Because the Schottky is
integrated with the MOSFET, its forward voltage drop is much lower than the
voltage drop across the intrinsic body diode of the MOSFET. This results in
substantially less power loss when the MOSFET is turned off during dead
time in a buck converter application.
A second improvement results from the lower reverse recovery charge (QRR)
of the Schottky diode compared with the QRR of the body diode of the
MOSFET. Vishay Siliconix SkyFET technology reduces QRR in the device by
almost 75 % from the standard MOSFET body diode, improving converter
efficiency at light loads.
Finally, integration of the Schottky into the MOSFET silicon chip
eliminates the parasitic inductances that would be present if these were
mounted to the PCB as individual components or if separate MOSFET and
Schottky diode components were co-packaged.
The improvement in efficiency enabled by these features translates directly
into lower energy usage, and thus lower electric bills for facilities such
as server farms and longer battery life between charges for laptop
computers.
Samples and production quantities of the Si4628DY are available now, with
lead times of 10 to 12 weeks for larger orders.
Vishay Intertechnology, Inc., a Fortune 1,000 Company listed on the NYSE
(VSH), is one of the world's largest manufacturers of discrete
semiconductors (diodes, rectifiers, MOSFETs, optoelectronics, and selected
ICs) and passive electronic components (resistors, capacitors, inductors,
sensors, and transducers). These components are used in virtually all types
of electronic devices and equipment, in the industrial, computing,
automotive, consumer, telecommunications, military, aerospace, and medical
markets. Its product innovations, successful acquisition strategy, and
"one-stop shop" service have made Vishay a global industry leader. Vishay
can be found on the Internet at http://www.vishay.com.
SkyFET and TrenchFET are registered trademarks of Siliconix incorporated.
