High-Current LED Driver Powers Cell-Phone Video Lighting

The first in a family of flash LED products, the AAT1270 step-up current regulator can drive either two LEDs up to 500 mA or one LED up to 1A. It is designed for use in mobile phones with video recording capability, delivering the high brightness levels needed for lighting for higher-resolution CCD imagers. The device comes in a lead-free, 14-pin, 3 mm x 3 mm STDFN package. The dual-channel AAT1270 uses a high-efficiency dc-dc boost converter with small magnetics. It does not require an external Schottky diode. The high 2-MHz switching speed and low input current ripple permit the use of a low-profile (0.9-mm high) 1-µH inductor. The regulator runs off a single-cell Li-ion power source and extends battery life by operating at efficiency levels of up to 85%. The AAT1270 is qualified across the –40°C to 85°C range. It sells for $1.42 each/1,000. ADVANCED ANALOGIC TECHNOLOGIES INC., Sunnyvale, CA. (408) 737-4600.