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Optoelectronics/Displays??

Smallest backlight LED driver?

Posted: 03 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:national semiconductor? led driver? lp3954?

Smallest backlight LED driverNational Semiconductor Corp. released what it touts as the world's smallest backlight LED driver that controls lighting applications in handheld devices, including cellphones, digital still cameras, gaming devices and MP3 players.

Housed in a tiny micro SMD package, the LP3954 advanced lighting management unit integrates two backlight drivers, a dual red-green-blue (RGB) LED controller, a flash LED driver and an analog-to-digital converter (ADC) on a single chip. The integrated, magnetic boost dc-dc converter efficiently drives high current loads over a wide battery voltage range.

"Our LP3954 is a highly integrated backlight LED driver that is easy-to-use, feature-rich and small enough to implement into any phone today," commented Gianluca Colli, director of integrated system products for National Semiconductor's Portable Power Products Group. "Built-in, stand-alone features, including backlight fading, RGB control and audio synchronization, allow differentiation and reduce software development time, helping manufacturers get their cellular phones to market faster."

The LP3954 drives two separately controlled white LED backlights for the main and sub-display. In the case of a single large display, these units can be combined together to drive up to six LEDs. According to the press release, the new integrated backlight driver is highly efficient, low-voltage structure with excellent matching that feature an automatic fade-in/fade-out function. The enhanced, stand-alone, command-based RGB controller allows more flexible control of color or RGB LEDs and is easy to configure, added National.

Additionally, the high-current camera flash LED driver has a programmable safety timer and features both a torch and a flash mode. The flash LED timing is triggered by an external signal, a key feature for cellphone cameras. An internal ADC enables either high resolution ambient light/temperature sensing or a built-in, multi-mode audio synchronization feature. The flexible SPI/I?C compatible interface allows easy control of the LP3954.

The LP3954 is housed in a 36-bump micro SMD Pb-free package that measures 3-by-3-by-0.6mm. Already available, the LP3954 advanced lighting management unit is priced at $2.10 in 1,000-unit quantities.




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