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LED driver turns on all the lights

Posted: 16 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:california micro devices'? cmd? cm4600? photonic? led driver?

California Micro Devices' CM4600, the first of the company's new PhotonIC family of highly integrated LED drivers, can drive all the LEDs in a wireless handset. By using the CM4600, handset and display module designers can achieve space savings of up to 50 percent, and reduce cost up to 40 percent compared to alternative solutions consisting of two or three chips.

The CM4600 features seven outputs, each delivering 25mA to support the backlight requirements of the primary and secondary displays, three outputs each providing 25mA to support RGB "funlights," and one output that delivers up to 250mA for the white LED camera flash. These outputs are all constant-current and matched to within one percent. The maximum current can be set with a single resistor. Programmability provided through the device's I?C interface enables designers to incorporate features such as blinking, dimming, linear dimming and various other sequences.

The CM4600 uses a charge pump architecture that provides high drive capability for the camera flash function with system operating efficiencies up to 95 percent.

The device data sheet is available at the company's website. The CM4600 is sampling now, and pricing starts at $2.20 each in 1,000 units. A comprehensive reference design kit is available for evaluation. Production is scheduled for Q3 2005.

- Vincent Biancomano

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