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White LED driver tailored for portable CE apps

Posted: 30 Dec 2005 ?? ?Print Version ?Bookmark and Share

Keywords:ON Semiconductor? LED driver? NCP5603?

NCP5603 white LED driver

ON Semiconductor unveiled a white LED driver designed to drive high brightness LEDs in torch or flash applications for camera phones and other portable consumer electronic devices.

The new NCP5603 provides power conversion by means of a charge pump structure, using two external ceramic capacitors, and eliminates the need for a bulky inductor to implement the power conversion.

This product supplies a constant voltage to the load from battery voltage ranges between 2.7V to 5.5V. Due to the automatic operating modes of 1X, 1.5X and 2X, it operates at up to 90 percent efficiency. According to ON Semi, this makes it particularly well-suited to drive the high current LEDs used in low cost, low power applications that demand extended battery life. Since the NCP5603 allows a high output current pulse of up to 350mA, added the company, it is suitable to drive a high brightness 1W power LED, enabling improved camera flash and delivering better picture quality. The LED driver also features a PWM/EN input, suitable for dimming requirements.

And because the NCP5603 does not require an external inductor for energy storage, it can also function as a low cost, small boost DC/DC converter that supplies a constant voltage of either 4.5V or 5V.

According to Andy Williams, VP of Power Conversion Division, ON Semi is offering the first in a series of high efficiency charge pump-based solutions targeted at cellphone form factors that have critical space constraints. "This series offers engineers high efficiency charge pump solutions with maximum flexibility in terms of output current control, short circuit protection, highly accurate current matching for backlighting and camera flash, while house in small, low profile DFN packages," Williams added.

The NCP5603 is offered in a DFN-10 package measuring 3-by-3-by-0.9mm, and is priced at 70 cents each in 1,000-unit quantities.




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