Communications
Low-cost WLED drivers help handset manufactures address latest entry level markets
A huge potential market of untapped cell phone users in regions like India, China, Russia, South America and Africa want cell phone service, but can only afford very basic, entry-level, reduced-feature-set phones. With AnalogicTech’s AAT3193, designers building cell phones for these new markets can provide basic illumination for low-cost TFT-LCD panels in an extremely small footprint while requiring just two external components; a 1µF capacitor for the charge pump and a single external resistor to set the full-scale LED current.
The Despite its no frills approach, the AAT3193 does not sacrifice performance. It drives up to three LEDs at up to 30mA each to support the illumination of lower cost, monochrome and highly opaque TFT-LCD panels. The next member in the product family, the AAT3192, will drive two LEDs. Both devices offer part-to-part current accuracy better than 10 percent and channel-to-channel current matching better than 3 percent. These charge pump-based devices automatically switch between 1x and 2x mode to maximise efficiency and to minimise the number of external components required.
Using the AAT3193, each LED can be programmed either using traditional linear PWM techniques or via AnalogicTech’s proprietary, patented single-wire S2Cwire interface. Designers using the S2Cwire interface can program each WLED up to 30mA each in 16, 8 or 4 steps. The device also features integrated thermal protection and automatic soft start.
The AAT3193 is qualified across the -40 to +85 degrees C temperature range and comes in a Pb-free, 10-lead, 2x2-mm SC70JW package.
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