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LED flash driver aims at high Mpixel camera phones

Posted: 19 Jan 2009 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver flash? megapixel phone camera? supercapacitor4A?

ON Semiconductor has developed a 4A supercapacitor LED flash driver dubbed CAT3224 for high megapixel camera phones and standalone camera applications. The CAT3224 supercapacitor LED driver supports three key functions: precise supercapacitor charging control, management of the current discharge into the LED flash and constant current for LED torch mode.

The supercapacitor LED flash driver sources up to 4A LED flash pulses and up to 400mA torch-mode current, with simple programming via external resistors on the analog control inputs. The device incorporates a dual-mode 1x/2x charge pump, which charges the stacked supercapacitor to a nominal voltage of 5.4V, while an active balance control circuit ensures that both capacitor cell voltages are matched during the charging cycle. In addition, the CAT3224 provides the user with a dedicated logic output to flag the completion of the supercapacitor charging sequence.

Housed in a 16-lead TQFN 3mm x 3mm x 0.8mm package, the CAT3224 features thermal shutdown, overvoltage protection and protection against external resistor programming faults.

Pricing starts at $0.97 per unit in 10,000-piece quantities. Samples and evaluation boards are now available.

- Ismini Scouras

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