NEW LITTLE FOOT POWER MOSFETS FOR ISOLATED DC-TO-DC CONVERTERS ARE PWM OPTIMIZED

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NEW LITTLE FOOT POWER MOSFETS FOR ISOLATED DC-TO-DC CONVERTERS ARE PWM OPTIMIZED
11 May 2001 - Vishay Electronic

A new series of LITTLE FOOT MOSFETs aimed at isolated dc-to-dc converters powered by a 24-V or 48-V bus was announced today by Siliconix incorporated, an 80.4%-owned subsidiary of Vishay Intertechnology, Inc. Intended for use in a wide range of telecommunications, high-voltage computer and server, and automotive products, the seven new n-channel devices are offered in breakdown voltages ranging from 60 V to 200 V. The Vishay Siliconix Si4850EY (60 V), Si4896DY (80 V), Si4484EY (100 V), Si4848DY (150 V), and Si4490DY (200 V) are designed for use on the primary side of dc-to-dc converters requiring higher frequencies or lower switching losses, and feature typical gate charge ratings from 18 nC to 34 nC in combination with on-resistance values ranging from 16.5 mW to 100 mW at a 10-V gate drive.

Intended for use in a wide range of telecommunications, high-voltage computer and server, and automotive products, the seven new n-channel devices are offered in breakdown voltages ranging from 60 V to 200 V.

The Vishay Siliconix Si4850EY (60 V), Si4896DY (80 V), Si4484EY (100 V), Si4848DY (150 V), and Si4490DY (200 V) are designed for use on the primary side of dc-to-dc converters requiring higher frequencies or lower switching losses, and feature typical gate charge ratings from 18 nC to 34 nC in combination with on-resistance values ranging from 16.5 mW to 100 mW at a 10-V gate drive.

The product of on-resistance times gate charge-a key figure of merit for power conversion applications-has been improved by 34% or more for each of the breakdown voltages provided by the new products, setting new industry records. With their optimized on-resistance and gate charge ratings, the new devices open the door to higher-frequency converters and smaller filtering components, or to cooler-running circuits enabled by lower switching and conduction losses.

Optimized for applications that require minimized conduction losses, the Si4486EY (100V) and Si4488DY (150 V) respectively lower on-resistance to 25 mΩ and 50 mW at a 10-V gate drive, with ultra-low gate charge values of 36 nC and 30 nC respectively.

Whether the objective is to generate less heat, or to minimize the size of end products with higher-frequency dc-to-dc converters, these new LITTLE FOOT devices represent a significant improvement over the power MOSFETs that have been available until now for medium-voltage systems. And with voltage ratings from 200 V down to 60 V, designers can have maximum flexibility in choosing the right topology for their applications.

Samples and production quantities of the new LITTLE FOOT SO-8 devices are available now, with lead times of 8 to 10 weeks for larger orders.

http://www.vishay.com

About: Vishay Electronic
Vishay Transducers is a division of Vishay Measurements Group. Vishay Measurements Group develops, manufactures, and markets a broad range of sensors for a wide variety of test and measurement applications. These include electrical resistance strain gages for both stress analysis testing and transducer manufacturing applications, load cells for approved weighing applications, force transducers, instrumentation, hybrid strain gage assemblies and bonding services.

Vishay, a Fortune 1,000 Company listed on the NYSE, is one of the world's largest manufacturers of discrete semiconductors (diodes, rectifiers, transistors, optoelectronics, and selected ICs) and passive electronic components (resistors, capacitors, inductors, and transducers). The Company's components can be found in products manufactured in a very broad range of industries worldwide. Vishay is headquartered in Malvern, Pennsylvania, and has operations in 17 countries employing over 26,000 people.

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