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For more information:
Media contact -  Bob Decker, Redpines
Phone:  1.415.409.0233 
Fax:  1.650.618.1512 
E-mail:  bob.decker@redpinesgroup.com

New LITTLE FOOT® Plus Driver Products for High- and Low-Side DC-DC Operation Integrate MOSFETs and Drive Circuitry in 10 mm by 6.2 mm Footprint


For more information:
Media contact -  Bob Decker, Redpines
Phone:  1.415.409.0233 
Fax:  1.650.618.1512 
E-mail:  bob.decker@redpinesgroup.com

SANTA CLARA, CALIFORNIA — February 12, 2003 — Five new LITTLE FOOT® Plus Driver products designed to simplify the use of n-channel MOSFETs in high-frequency buck regulators were announced today by Siliconix incorporated (NASDAQ: SILI), an 80.4%-owned subsidiary of Vishay Intertechnology, Inc. (NYSE: VSH).

With efficiencies better or comparable to competing implementations in the MLF/QFN/Power Block packages, these new devices in the LITTLE FOOT® SO-16 feature a ≥38% smaller, standard footprint, simplifying design, assembly, soldering, and layout.

The n-channel Si4738CY (20 V), Si4770CY (20 V), Si4724CY (30 V), Si4732CY (30 V), and Si4768CY (30 V) synchronous MOSFETs with integrated driver circuitry are designed to extend battery life and/or enable more efficient use of power. Applications will include high-frequency, multi-phase dc-to-dc switchmode power supplies for CPU core, graphics control, chipset, and auxiliary power in systems including desktop computers, servers, workstations, notebook computers, and tablet PCs, and point of load (POL) applications for fixed telecom systems.

With optimized on-resistance values and "shoot-thru" protection for low-side operation, and QGD optimized for high efficiency in high-side operation, the new devices provide high efficiency while enabling an integrated board layout with significant space savings over discrete solutions.

By integrating two MOSFETs and a driver in a compact SO-16 package, the Vishay Siliconix devices released today offer reduced gate-drive losses and higher switching frequencies while simplifying board layout and allowing designers to implement less-complicated controller solutions.The Si4724CY also features an integrated Schottky diode, further reducing the number of components required on the printed circuit board.

LITTLE FOOT® Plus Driver products in the SO-16: Summary Table

Part number VDS (V) Gate Drive (V) rDS(on) (Ω) High Side fmax (kHz) Iout (A) Driver Impedance (Ω)
High Side Low Side
Si4724CY 30 5 0.0375 0.0290 1000 6 3
Si4732CY 30 5 0.0280 0.0080 700 10 3
Si4738CY 20 5 0.0100 0.0060 700 14 3
Si4768CY * 30 5 0.017 0.008 1000 14 1
Si4770CY * 20 5 0.009 0.005 1000 16 1

* Advance information

Each device features a switching frequency of up to 700 kHz+, driver impedance of 1 or 3 Ω, and operation down to 4.5 V, as well as break-before-make action and under-voltage lockout.

Samples and production quantities of the new LITTLE FOOT® Plus Driver products are available now with lead times of 10 to 12 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, six-inch wafer fab dedicated to the manufacture of power products in Santa Clara, California, and an affiliated Class 1, six-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, China. 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 Intertechnology, Inc., a Fortune 1000 Company listed on the NYSE (VSH), is one of the world's largest manufacturers of discrete semiconductors (diodes, MOSFETs, and infrared optoelectronics) and passive electronic components (resistors, inductors, and capacitors). These components are used in virtually all types of electronic devices and equipment, in the industrial, computing, automotive, consumer, telecommunications, military, aerospace, power supplies, and medical markets. Vishay’s product innovations, successful acquisition strategy, and "one-stop shop" service have made it a global industry leader. Vishay can be found on the Internet at www.vishay.com.

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LITTLE FOOT® is a registered trademark of Siliconix incorporated.

For more information:
Media contact -  Bob Decker, Redpines
Phone:  1.415.409.0233 
Fax:  1.650.618.1512 
E-mail:  bob.decker@redpinesgroup.com