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RGB LED driver suits fun lighting in portable apps

Posted: 20 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:RGB LED driver? fund lighting? portable applications?

ON Semiconductor Corp. has designed a triple-output LED driver specifically for tricolor RGB LEDs. The NCP5623, with an I?C interface and built-in gradual dimming, is ideal for fun lighting or enhanced LCD backlighting in portable applications such as cellphones and MP3 players.

Offered in the compact LLGA-12 package, the NCP5623 is said to be the smallest RGB LED charge pump driver housed in a non-bump plastic package available today.

To help maximize battery life, the NCP5623 achieves 94 percent peak efficiency with less than 1mA standby current over the operating range of a lithium-based battery. Despite the small IC package, the device requires only four passive components to operate in a typical application, said ON Semiconductor. The device also features short-circuit and over-voltage protection to safeguard the system in case of LED failure.

The NCP5623 LED driver performs autonomous operations upon the command of the processor via its I?C interface. Its three independently controlled current outputs with 0.5 percent typical matching tolerance and 32 current levels allow the display of more than 32,000 colors with a tricolor 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 color changes appear smooth and linear to the human eye.

The NCP5623 is housed in a Pb-free 2mm x 2mm x 0.55mm LLGA-12 package.

Pricing starts at 55 cents per unit in quantities of 3,000.

- Gina Roos

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