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Optoelectronics/Displays??

LED driver offers alternative to '604 standard

Posted: 18 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? '604 standard alternative?

CAT3604V

Catalyst Semiconductor Inc. has launched its newest quad-mode fractional charge pump LED driverthe CAT3604V. The new device is a four-channel LED driver that provides an alternative to the industry-standard '604 with similar functionality, and the added benefits of Catalyst's patented quad-mode switching architecture.

Quad-mode technology delivers the high efficiency levels normally associated with inductor-based LED drivers, while eliminating the associated high-profile inductors and unwanted EMI. Most charge pump LED drivers today offer three modes of operation corresponding to the ratio of the output voltage to the input voltage: 1x, 1.5x and 2x. The quad-mode architecture of the CAT3604V adds a fourth mode of operation, 1.33x, to deliver the higher average efficiency, without the need for the additional capacitor required by all existing four-mode charge pumps. The 1.33x fractional operating mode also reduces the input switching currents seen at the battery, minimizing the overall supply noisea critical parameter in portable devices such as cellphones.

The new CAT3604V is a four-channel charge pump with a PWM dimming interface and channel diagnostics, which include automatic detection for both short and open LED channel conditions to ensure the device maintains the highest efficiency level in all operating modes.

The CAT3604V LED driver is priced at 48 cents each in 10,000-piece quantities. Samples and evaluation boards are also available. Projected lead-time for production quantities is currently six to eight weeks ARO.




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