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World’s smallest LED driver for handheld devices

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article image The integrated backlight drivers are highly efficient.

NATIONAL Semiconductor has launched the world's smallest backlight light emitting diode (LED) driver - the LP3954 advanced lighting management unit. The device controls lighting applications in handheld devices, including cellular phones, 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.

"National's LP3954 is a highly integrated backlight LED driver that is easy-to-use, feature-rich and small enough to implement into any phone today," said the director of integrated system products for National Semiconductor's Portable Power Products Group, Gianluca Colli. "Built-in, stand-alone features, including backlight fading, RGB control and audio synchronisation, 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. The integrated backlight drivers are highly efficient, low-voltage structures with excellent matching that feature an automatic fade-in and fade-out function.

The enhanced, stand-alone, command-based RGB controller allows more flexible control of colour or RGB LEDs and is easy to configure. 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 cell phone cameras.

An internal ADC enables either high resolution ambient light and temperature sensing or a built-in, multi-mode audio synchronisation feature that drives colour LEDs based on an audio input from an MP3, for example. The flexible SPI/I2C compatible interface allows easy control of the LP3954. The device is housed in a tiny, 36-bump micro SMD lead-free package that measures 3mm x 3mm by 0.6mm.

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