AnalogicTech Multi-String Backlight LED Drivers

Advanced Analogic Technologies Inc. (Santa Clara, CA), an analog-semiconductor company focused on powering innovative solutions in consumer, industrial, and communications markets, has introduced its AAT1409/7/5 family of multi-string LED backlight drivers. The AAT1409/7/5 drivers offer integrated boost converters and precision current sinks that can support up to 88 LEDs at 360mA total LED current. These new drivers bring to market a fully featured solution that reduces the number of backlight PCBs, reducing costs, yet is capable of driving high brightness LEDs and ensuring uniformity across the display by precisely controlling the backlight intensity.
The AAT1409/7/5 drivers operate from DC inputs, cigarette lighter adapters or multi-cell Li-ion batteries over the 4.5V to 26V range. The family is available in 8, 6 and 4 channels making them ideal for driving white LED (WLED) edge backlighting for LCD panels ranging from 10 to 22 in. The drivers also support up to 100 kHz PWM dimming frequency to ensure silent operation.
Since many portable LCD devices are battery-powered and operate under low ambient lighting conditions or in power saving modes, and thus require low-level backlight dimming to extend battery run time, the AAT1409/7/5’s design maintains high efficiency during low PWM duty cycles to reduce wasted energy during light load conditions. The driver’s high resolution 1000:1 PWM dimming range delivers precise control of backlight brightness, equivalent to a 10-bit resolution.
(408) 737-4600; karoliencw@analogictech.com