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News

New TrenchFET Gen II Power MOSFETs for synchronous buck converters

Vishay Electronic : 10 December, 2003  (New Product)
Two new devices that bring the ultra-low on-resistance of high-density TrenchFET Gen II technology to Qg/PWM-optimized MOSFETs were announced today by Siliconix incorporated, an 80.4%-owned subsidiary of Vishay Intertechnology, In.
Compared with the next-best SO-8 devices on the market, the new Si4336DY (LITTLE FOOT SO-8) and Si7336DP (PowerPAK SO-8) offer a 13.5% better on-resistance-times-gate charge product of 83 mΩnC, which is the key figure of merit used by designers to select power MOSFETs for synchronous buck converter applications. The ratio of gate-to-drain and gate-to-source charges, which further impacts efficiency, has been improved by 35.6%.

Used as the low-side MOSFET in computer synchronous buck converters, or for fixed-telecom synchronous rectification or point-of-load converters, the Si4336DY and Si7336DP provide reduced switching and conduction losses, or higher current operation with the same efficiency, at frequencies up to 1 MHz.

When paired with two WFETTM power MOSFET devices on the high side of a synchronous buck converter, two Si4336DY MOSFETs on the low side yield a 1.0% improvement in efficiency over the next-best competitive SO-8 pair. This higher efficiency translates directly into benefits including longer battery life in portable systems, cooler operation, and the ability to add features and functionality requiring higher levels of current.

Both devices are designed for operation at up to 1 MHz and feature a typical rDS(on) of 2.6 mΩ (VGS=10 V) and typical gate charge of 32 nC (VGS=4.5). A high threshold voltage combines with the devices' extremely low QGD/QGS ratio to offer substantial shoot-thru protection and add efficiency by providing good margin for noise and voltage spikes. The Si7336DP's PowerPAK packaging further enhances performance with increased thermal conductivity, current handling, and power dissipation capabilities.

The new Si4336DY and Si7336DP are 100% Rg-tested, minimizing the effect of device variation and ensuring that devices will perform to minimum and maximum specifications in high-frequency applications.

Samples and production quantities of the Si4336DY and Si7336DP are available now, with lead times of 10 to 12 weeks for larger orders.
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