Product category:
Power Supply ICs and Controllers
News Release from: Advanced Analogic Technologies | Subject: AAT3193
Edited by the Electronicstalk Editorial
Team on 27 July 2007
LED driver is cost engineered for budget
handsets
Driver chip provides basic illumination for low-cost TFT-LCD panels in an extremely small footprint while requiring just two external components.
A huge potential market of untapped cellphone users in regions like India, China, Russia, South America and Africa want cellphone service, but can only afford very basic, entry-level reduced-feature-set phones With AnalogicTech's AAT3193, designers building cellphones 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 1uF capacitor for the charge pump and a single external resistor to set the full-scale LED current
This article was originally published on Electronicstalk on 16 Jun 2004 at 8.00am (UK)
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The AAT3193 is the first in a family of two and three channel charge pump-based WLED drivers.
Targeted at a new generation of highly affordable handsets, these new devices offer excellent performance in an extremely space-efficient 2 x 2mm package.
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% and channel-to-channel current matching better than 3%.
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, eight or four steps.
The device also features integrated thermal protection and automatic soft start.
The AAT3193 is qualified across the -40 to +85C temperature range and comes in a Pb-free, 10-lead, 2 x 2mm SC70JW package.
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