New Vishay Siliconix Triple-Output Switching Power Supply Controller, Rated for 50 W, Replaces 3 ICs for Broadband and Consumer Electronics Power Conversion.

Business Editors/High-Tech Writers

SANTA CLARA, Calif.--(BUSINESS WIRE)--Feb. 24, 2003

A new dc-to-dc switching power supply controller that combines the functions of three PWM and PSM converter ICs in a single device was launched today by Siliconix Inc. (NASDAQ: SILI), an 80.4 percent-owned subsidiary of Vishay Intertechnology Inc. (NYSE: VSH).

Aimed at power conversion applications in consumer appliances such as set-top boxes, DVD players, notebook computers, and telecom and broadband networks, the new Si9139 power supply controller takes a 4.5- to 30-V input voltage and converts it to three individual, tightly regulated dc-to-dc converter outputs, and one 5-V output.

Offering power conversion efficiency in the 95 percent range, the Si9139 integrates two main synchronous step-down controllers operating at up to 6 A, each with seven fixed outputs from 1.5 V to 3.3 V, and an adjustable step-up/down controller whose output can be set to any value between 1.24 V and 20 V with an external resistor divider. This adjustable capability on the third output at 500 mA is an industry first for any such device. An on-board 5-V, 30-mA linear regulator provides an effective fourth output.

The Si9139's two main dc-to-dc outputs provide individual control for power-up sequencing, power-good signal with delay, internal frequency compensation networks and automatic boot-strapping.

With a 50-W power rating, the Si9139 will work efficiently with the most powerful microprocessors and DSPs with +/-3 percent total regulation by line, load and temperature. Additional features include internal soft-start and output overvoltage protection and undervoltage shutdown.

Minimal external components are required for a complete solution, for which Vishay delivers the complete bill of materials including PowerPAK and LITTLE FOOT power MOSFETs and the three required inductors. No transformer is needed.

Direct link to product data sheet: http://www.vishay.com/docs/71841/71841.pdf.

Packaged in the 28-pin SSOP, samples and production quantities of the Si9139 are available now, with lead times of eight weeks for larger orders.

Siliconix, a company of Vishay Intertechnology Inc., is a leading manufacturer of power MOSFETs, power ICs and analog switches for computers, cell phones, fixed communications networks, automobiles and other electronic systems. With 2001 worldwide sales of $305.6 million, the company's facilities include a Class 1, 6-inch wafer fab dedicated to the manufacture of power products in Santa Clara and an affiliated Class 1, 6-inch wafer fab located in Itzehoe, Germany. Power products are also manufactured by a subcontractor in Japan. Analog switches, analog multiplexers and low-power transistors are fabricated by subcontractors in Dresden, Germany, and in Beijing. Assembly and test facilities include a company-owned facility in Taiwan, a joint venture in Shanghai, China, and subcontractors in the Philippines, China and the United States.

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, Pa., and has plants in 16 countries employing more than 25,000 people. Vishay can be found on the Internet at http://www.vishay.com.

PowerPAK is a trademark and LITTLE FOOT is a registered trademark of Siliconix Inc.