Siliconix Intros Si4336DY/Si7336DP Power MOSFETs
Siliconix Inc. (Santa Clara, CA), a subsidiary of Vishay Intertechnology Inc. (Malvern, PA), introduced the new Si4336DY (LITTLE FOOT SO-8) and Si7336DP (PowerPAK SO-8) TrenchFET Gen II power MOSFETs for synchronous buck converters, which offer a 13.5% better on-resistance-times-gate charge product of 83 milliohms nC. 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 1MHz. When paired with two WFET 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.
Both devices are designed for operation at up to 1MHz and feature a typical on-resistance of 2.6 milliohms (at a 10V gate drive) and typical gate charge of 32nC (at a 4.5V gate drive). A high threshold voltage combines with the devices' low gate charge 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.
Samples and production quantities of the Si4336DY and Si7336DP are available now, with lead times of 10 to 12 weeks for larger orders. Pricing in 100,000-piece quantities starts at $1.35.
