Product category:
Discrete Power Devices
News Release from: Vishay Siliconix | Subject: PowerPAK power MOSFETs
Edited by the Electronicstalk Editorial
Team on 17 June 2003
Novel power package reduces MOSFET
on-resistance
Siliconix has released 14 industry-leading PowerPAK power MOSFETs featuring improved package technology that yields lower on-resistance devices.
Siliconix has released 14 industry-leading PowerPAK power mosfets featuring improved package technology that yields lower on-resistance devices Research conducted by Siliconix indicates that these new devices offer the best performance of any power mosfets in a thermally enhanced package
This article was originally published on Electronicstalk on 17 Jun 2003 at 8.00am (UK)
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The new PowerPAK devices provide on-resistance, gate-charge and on-resistance-times-gate-charge values optimised for synchronous low-side operation and/or high-side control operation in core voltage DC/DC buck convertors, and for secondary-side synchronous rectifiers in isolated DC/DC convertors.
The new devices are designed for use in single or multiphase power supply circuits in server and desktop computer applications; notebook computer applications requiring 30V devices; and in DC/DC convertors and point of load (POL) convertors in fixed telecomms applications.
The PowerPAK SO8 package provides up to 60% better power dissipation and up to 45% higher drain current than standard SO8 devices, thanks to its order-of-magnitude lower thermal resistance.
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A new range of power MOSFETs uses a breakthrough TrenchFET technology to combine greatly reduced switching losses with ultralow on-resistance.
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Compared with devices in the DPAK package, PowerPAK has a 53% smaller footprint area and a 55% thinner profile.
The higher efficiency of PowerPAK power mosfets prolongs battery life in notebook computers while allowing them to run cooler and more reliably.
In fixed telecomms applications, the new devices' high efficiency enables design of smaller end products with less intrusive cooling requirements.
For low-side DC/DC applications in computers, Vishay offers the 20VDS/20VGS Si7866DP and 30VDS/12VGS Si7442DP, which offer on-resistance values of just 3.75 and 3.2mohm (4.5VGS), respectively - values that are 25 and 27% lower than those offered by the best competing devices.
The new Si7880DP (30V DS/20V GS) features an exceptionally low on-resistance of just 4.25mohm, 20% lower than the best competing devices.
All these low-side, low-on-resistance devices have an optimised Qgd/Qgs of less than 1 to help prevent the low-side mosfet from going into a "shoot-through" situation during which both the high and low side are on, creating a short from the input voltage to ground.
For fixed telecomms applications, the lowest mosfet on-resistance is offered in the 12 to 40V range including key telecomms rectification voltages (20 and 30V DS) for use in a variety of topologies.
In addition to the Si7866DP, Si7442DP and Si7880DP, the Si7858DP, Si7862DP, Si7864DP, Si7868DP, Si7458DP and Si7884DP offer the lowest on-resistance for their respective voltage grades.
With their exceptionally low on-resistance values, these PowerPAK SO8 devices provide low conduction losses and increased efficiency for prolonged battery life and/or cooler system operation.
For power conversion applications in computers, the 30V DS/20V GS Si7860DP offers the lowest on-resistance-times-gate-charge product in the industry just 143.
A Qgd/Qgs of less than 1 prevents "shoot-through" conditions, and the Si7860DP's industry-leading performance allows designers to use the same power mosfet for both the low and high side, thereby reducing the cost and complexity of the assembly process.
For fixed telecomms applications, the Si7368DP, Si7366DP, Si7864DP, Si7860DP, and Si7884DP are optimised for high switching frequencies.
Vishay's 30V DS/20V GS Si7892DP provides both a low on-resistance-times-gate-charge product of 150 and low on-resistance of 6mohm for enhanced efficiency.
The Si7806DN operates with minimal switching losses to maximise efficiency in low-duty-cycle DC/DC applications.
In fixed telecomms and high-side computer operation, the 30V DS/20V GS Si7806DN offers an exceptionally low gate charge of just 8.5nC (4.5V GS) and a low on-resistance-times-gate-charge product of just 149 in the smaller PowerPAK12128 package, just one-third the size of the PowerPAK SO-8 package.
Vishay Siliconix offers more than 60 parts within the PowerPAK device family, by far the industry's most comprehensive selection of thermally efficient devices.
Samples and production quantities of the new PowerPAK devices are available now with lead times of 8 to 10 weeks for larger orders.
Pricing for US delivery in 100,000-piece quantities ranges from $0.82 to $1.93.
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