PR4401/4402 0.9V-White LED driver  - needs only one external component
	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	The core of this white LED driver 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. For operation of up three LEDs is only one external component needed, which is an inductor. It is recommended to use an inductor value of 22 µH for a maximum battery lifetime ( more than 55 hours with an AA alkaline battery). With a 10 µH coil higher currents can be reached for maximum brightness of the white LEDs.   Data Sheet         Distribution   The battery current will be reduced to less than 10 µA in case that the supply voltage drops to avoid a deep discharge of the battery. Two different versions are available, the PR4401 offers a maximum current of 22mA, the PR4402 drives up to 40mA. Both versions are delivered in a compact SOT23-3 package, for size-sensitive applications also chip on board assembly is possible. Both LED drivers offer a low-cost three-component-solution for example for small LED flash lights or torches. Demoboards and samples are available.