News  0.9V DC/DC Converter for white LEDs
	PREMA ASICS Application Examples The Way to your ASIC Integration, your Benefit ASIC DESIGN ASIC Functions Chip Design Tools IC Design Seminar WAFER PRODUCTION ModuS U6 ASIC Process Clean Room Technology Quality Management PREMA SEMICONDUCTOR About us Press Our City Imprint CONTACT INFO Brochure Request Distributors How to find PREMA Jobs & Careers	Mainz, Germany, September 03, 2004 A driver IC for white LEDs is offered by ASIC manufacturer PREMA Semiconductor. Its core consists of a step-up converter with current output, which provides an output voltage of typically 3.6 V for white LEDs. The input voltage can be as low as 0.9V, thus allowing a. single cell battery operation. Depending on the application the LEDs can be driven with pulsed or constant currents. The first alternative has the advantage of an optimized battery lifetime, and only a coil is required as an external component. If optimized for maximum brightness, an external Schottky diode and a capacitor have to be added. Additional features can be integrated into the ASIC on customer's request.  A charge control circuit or an undervoltage detection might be desirable to avoid a total discharge of a rechargeable battery. A sensor amplifier or a digital control are other examples for additional features. All functions necessary for a compact LED pocket torch with various extra functions, or other battery driven devices with LED illumination can be integrated into one IC. These and other useful circuit blocks are part of the PREMA cell library. The cells are used as a basis for the chip design and are customized for the specific application. Thus development times are considerably reduced. Since the IC is designed exclusively for a specific application of one customer, it becomes a true ASIC (application specific IC). This means that the customer gets all the advantages of an ASIC, like protection against product replications and long-term availability. Please find more information on the PREMA web side: www.prema.com. or  www.prema.com/Application/whiteleddriver.html PREMA Semiconductor exhibits at the electronica 2004 trade fair in Munich, 9.-12. November. In hall A4, booth 406 our application engineers are available for consultation on analog and mixed-signal ASICs. Contact: Matthias Linde, PREMA Semiconductor GmbH Phone: +49-6131-5062-167 prema@prema.com