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Versatile Buck or Boost Controller IC Provides Regulated Power For Mobile Phones, PDAs, and Notebook Computers: New Vishay Siliconix Device Offers Programmable Step-Up/Step-Down Modes, Operates With ~95% Efficiency Under Full Loads
MALVERN, PENNSYLVANIA - March 7, 2000 - A new controller IC for buck or boost converters in mobile phones, wireless modems, notebook and palmtop computers, and other systems powered by dual lithium ion cells was released today by Vishay Intertechnology. The new Vishay Siliconix Si9168BQ can be used to step down or step up input voltages, allowing manufacturers to rely on a single IC for both types of applications.
Prolonging talk times and run times in the end products where it is used, the Si9168BQ offers one of the highest operating efficiencies of any such solution on the market: typically in the 95% range under full load, and in the 80% range for light-load conditions.
When used in a buck configuration, the Si9168BQ converts input voltages between 5 V and 10 V to an output voltage as low as 1.3 V. Used in a boost configuration, the Si9168 boosts input voltages as low as 5 V to as high as 12.6 V.
The Si9168BQ will be used to provide regulated power to analog, DSP, filtering, and RF circuitry. Buck or boost programmability allows designers to use the Si9168BQ to power either high-voltage (7.2 V) or low-voltage (4 V) power amplifiers. Its extremely fast line and load transient response time, less than 10 microseconds, allows a rapid response to changing load conditions, as when a microcontroller wakes up from sleep mode to normal operation. A synchronization feature allows designers to keep noise out of any sensitive processing frequencies.
The Si9168BQ's high frequency operation, up to 2 MHz, allows the use of smaller inductors and lower levels of output capacitance, reducing the board space required for a complete solution. Depending on the topology, output capacitance can be reduced to as low as 10 microfarads, with peak-to-peak ripple as low as 10 mV. Combined with the new Vishay Dale IHLP2525 inductor, a total converter can be designed with a height profile of just 1.9 mm.
"The Si9168BQ provides one of the smallest solution footprints on the market for any 9-W converter," said Tony Armstrong, Marketing Director at Vishay Intertechnology. "In addition to providing longer battery life for notebook PCs, cell phones, and PDAs, it will help to make the overall designs lighter, smaller, and thinner."
Packaged in the 16-pin TSSOP, the Si9168BQ can operate from dual-cell lithium ion batteries or five-cell NiCd or NiMH batteries and is compatible with TDMA, CDMA, GSM, and PCS power amplifiers. PWM-optimized LITTLE FOOT power MOSFETs in compatible SOIC packages provide designers with a wide range of choices for the maximum current of the converter output stage.
Samples of the Si9168BQ are available now. Production quantities will be available in March 2000 with lead times of 10 to 12 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.