2A Single-Inductor RGB LED Driver Outfits Portable Projectors

Introduced as the industry’s first 2A red, green, and blue (RGB) LED driver for portable projectors, the LM3435 drives three common-anode RGB high-brightness LEDs sequentially with a single inductor. It includes an I²C control interface for LED current control. Integrating all active components including an N-Channel main MOSFET, P-Channel synchronous MOSFET, and three N-Channel pass switches, it accepts input voltage from 2.7V to 5.5V. Current-pulse levels are individually programmable linearly for 1,023 steps. The maximum level of the current pulse can be set by three external resistors to ground from 0.5A to 2A respectively. Additionally, the non-isolated flyback converter with synchronous rectification ensures buck-boost operation at high efficiency. Samples are available now with production quantities coming in July. In a 40-pin thermally enhanced LLP package, price is $4.50 each/1,000. NATIONAL SEMICONDUCTOR CORP., Santa Clara, CA. (800) 272-9959.