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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 Vishay Siliconix LDOs Offer Industry's Lowest Dropout Voltage at 300 mA in Tiny, Leadless PowerPAK® Package


LDO

Products mentioned:

Si91871
Si91872
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 - April 14, 2003 - Two new 300-mA low-noise low dropout (LDO) regulators, each packaged in a 3 mm x 3 mm PowerPAK MLP33, were released today by Siliconix incorporated (NASDAQ: SILI), an 80.4%-owned subsidiary of Vishay Intertechnology, Inc. (NYSE: VSH).

Designed for use in battery-powered equipment such as cell phones, wireless handsets and modems, PDAs, notebooks, pagers and digital cameras, the new ICs are small enough to fit on tiny circuit boards in miniaturized wireless devices while handling up to 1.2 W of power dissipation.

The Si91871 and Si91872 feature a low ground current - ideal for low-voltage battery-operated power systems - and low dropout voltage of 250 mV at 300 mA, prolonging battery life in portable electronics.

Designed to maintain regulation while delivering 400-mA peak output current in applications with high surge currents at turn-on, the Si91871 and Si91872 are available in a range of 14 fixed output voltage options from 1.2 V to 5.0 V. Both devices feature 1.5% guaranteed output voltage accuracy, a fast start-up time of 60 μs, and fast transient response of ≤ 30 μs. A built-in active pull-down clamp circuit improves transient response and regulation by actively sinking current from the output if it exceeds the desired regulation voltage. Both devices discharge the output during shutdown mode through a 100-Ω n-channel MOSFET. Integrated short-circuit and thermal protection ensure reliable operation. Reverse battery protection limits reverse current flow to a 1-μA maximum shutdown current. When no output is required, an ON/OFF feature allows digital circuitry to shut off the device to save power.

Designers will choose between the Si91871 and Si91872 depending on the specifics of their application. The Si91871 is especially suited for sensitive RF receiver or audio amplifier environments, with an external noise bypass capacitors that reduces output noise to just 30 μV(rms), while the Si91872 provides an out-of-regulation error flag.

The Si91871 and Si91872 may be used with low-ESR ceramic capacitors or tantalum capacitors, giving designers a flexible choice of magnetic components.

Samples and production quantities of the new devices are available now for most voltage options, with lead times of 8 to 10 weeks for larger orders.

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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PowerPAK 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