Triple-output driver for tricolour LEDs

19 September 2007 Opto-Electronics

Specifically designed to drive tricolour RGB (red, green, blue) LEDs for fun lighting or enhanced LCD backlighting in portable applications such as cellphones and MP3 players, the new NCP5623 from ON Semiconductor is a high efficiency triple-output LED driver with I²C interface and built-in gradual dimming.

The NCP5623 performs autonomous operations upon the command of the processor via its I²C interface. Its three independently controlled current outputs - with ±0,5% typical matching tolerance and 32 current levels - allow the display of more than 32 000 colours with a tricolour RGB LED. The device's integrated gradual dimming feature progressively increases or decreases output current to produce a theatrical fade-in/fade-out effect. The use of a logarithmic current profile ensures the light and colour changes appear smooth and linear to human eyes.

To help maximise battery life in portable applications, the NCP5623 achieves 94% peak efficiency with less than 1 μA standby current over the operating range of a lithium-based battery. Despite the small IC package (2 x 2 x 0,55 mm LLGA-12), the device requires only four passive components to operate in a typical application. It also features short-circuit and over-voltage protection, which protects the system in case of LED failure.

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