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Optoelectronics/Displays??

LED driver eases interface control for backlighting

Posted: 18 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? interface control? display backlighting?

Catalyst Semiconductor Inc. has expanded its line of patented Quad-Mode fractional charge pump LED drivers with a new device optimized for portable products. The new CAT3637 addresses the requirements for high-efficiency and easy LED programming in these products, with 10-percent higher efficiency (compared to three-mode charge pumps) and a simple, 1-wire EZDim interface control.

The CAT3637 is optimized for applications with one bank of five or six identical LED channels, a typical configuration for larger LED screen portable products. The device incorporates a simplified version of Catalyst's 1-wire EZDim interface, which supports 16 output power levels, from from zero to 30mA full brightness 2mA resolution steps. The quad-mode CAT3637 saves board space and cost in next-generation portable products as it delivers up to 93 percent efficiency, requires no added capacitor and comes in a 3mm x 3mm low-profile TQFN package.

According to Scott Brown, VP of marketing for Catalyst Semiconductor, "When it comes to LED-based products, we are seeing a wide variety of design approaches throughout the market, depending on the customer and application. The CAT3637 is the fifth device in Catalyst's quad-mode product line and exemplifies our strategy to be a 'one-stop' vendor for a broad range of LED drivers which address this diversity of customer requirements."

The CAT3637 joins the following devices in Catalyst's quad-mode family of LED drivers: the CAT3604V four-channel LED driver with PWM dimming interface; and the CAT3636 six-channel, CAT3644 four-channel and CAT3643 three-channel devices with 1-wire EZDim interface.

The CAT3637 LED driver is priced at 82 cents each in 10,000 piece quantities. Samples and evaluation boards are also available. Projected lead-time for production quantities is currently 6 to 8 weeks ARO.





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