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Small LED drivers target portable apps

Posted: 11 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:boost LED drivers? boost switching regulator? MIC2298?

Micrel Inc. claims to have developed the industry's tiniest and most powerful LED driver for portable applications that enables designers to enhance integrated cameras with a high-brightness LED flash while keeping board space and battery life to minimum levels.

Housed in a 3-by-3mm MLF package, the 7W MIC2298 high-efficiency boost switching regulator works in photoflash and torchlight applications in cellphones, PDAs and digital cameras. It offers a guaranteed switch current of 3.5A, allowing the device to deliver 1A into two high-brightness WLEDs connected in series. This enables a powerful flash that improves picture quality, particularly in 2Mpixel and higher cameras, said Micrel. The LED brightness can be dynamically controlled by applying a voltage or PWM signal to the brightness pin.

The chip operates at a fixed 1MHz switching frequency with greater than 86 percent efficiency for longer battery life. MIC2298 requires only a tiny 2.2?H inductor and small ceramic capacitors, making the footprint very compact. Moreover, the solution operates from an input voltage range of 2.5-10V, which is consistent with the operating range of single and dual cell Li-ion batteries, said the company.

Available now, prices start at $1.65 for 1,000-piece quantities.

- Gina Roos

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