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LED driver delivers easy interface control for portable device backlighting

Santa Clara, Calif. — 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 CAT3637 addresses the requirements for high-efficiency and easy LED programming in portable devices, with 10 percent higher efficiency when 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 easy-to-use, 1-wire EZDim interface, which supports 16 output power levels, from zero to 30 mA full brightness in 2 mA steps. With efficiency levels as high as 92 percent, no added capacitors are required. Housed in a 3 x 3-mm, low-profile TQFN package, the Quad-Mode CAT3637 also saves board space and costs in next-generation portable products.

Pricing: $0.82 each in quantities of 10,000.
Availability: Samples and evaluation boards are available. Projected lead time for production quantities is currently six to eight weeks ARO.
Product information: CAT3637

Catalyst Semiconductor , www.catsemi.com

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