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Optoelectronics/Displays??

LED driver maximizes battery life

Posted: 19 Apr 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Catalyst Semiconductor? LED driver? CAT3612? camera?

Catalyst Semiconductor Inc. expanded its family of LED drivers with the CAT3612, a fully programmable, 300mA camera flash LED driver. This new device combines the company's recently introduced, flexible 1-Wire EZDim programming along with a tightly matched pair of high power output channels to accommodate the flash brightness requirements of today's increasing mega-pixel camera phones.

According to the press release, the CAT3612 reduces system complexity by providing full programmability of all flash functions, including setting enable/disable and brightness level of the flash function from a single microcontroller pin via Catalyst's 1-wire EZDim programming interface.

Designers have control of current and brightness with 32 programmable output power levels for setting flash (strobe) and movie (torch) modes. Traditional flash LED devices typically offer very limited, pre-defined and pre-set brightness values for flash/movie modes, whereas the CAT3612 offers fine resolution programming (5mA steps per channel) to meet specific system requirements, explained Catalyst. Additionally, dual, tightly matched output channels make the device suitable for camera flashes using multi-LED modules or single, high-brightness LEDs.

The CAT3612 promises to maximize battery life with its automatic 1x/1.5x charge pump which delivers up to 90 percent power efficiency. When disabled, the device enters "Zero" current shutdown mode, eliminating battery drain when not in use. Protection against short-circuit and thermal overload fault conditions is also included.

The new LED driver is offered in a RoHS-compliant 3-by-3mm TDFN 12-lead package. Ordering code is CAT3612HV4 and pricing for 10,000 piece quantity is $1.06. Samples and evaluation kits are already available. Projected lead-times for production quantities are currently 6 to 8 weeks ARO.




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