Semtech's charge pump for flash LED

The company recently announced the launch of Semtech for constant current charge pump SC618 white LED, the device provides protection function innovation, flash applications used in cellular telephone, PDA and digital camera. SC618 is the company's next generation of charge pump IC, which is designed to drive and protect flash applications in high current LED. Using only one set resistor can be the device set to two working modes: (1) flash mode: in a very short period of time, provide high strength burst current driving capability for the highest 700mA flash LED; (2) the spotlight (flashlight) mode: provides low current, specific value not sure. The current in the spotlight mode is set to 40% of the flash mode current, allowing the LED to be kept for longer periods of time while the battery consumption is small.

SC618 provides a timing cut off the flash output current of the innovative design, so it can prevent high current loading time due to improper operation is too long and damage the load. After flashing one second, the SC618 cut off (disable) the output current to protect the system from delays in executing or missing instructions for software errors or system failures. The timing function is a part of the integrated protection function set, and other protection functions include input overvoltage protection, output overvoltage protection, over temperature protection, short circuit protection and soft start function. The SC618 has a constant current regulation capability with a minimum and maximum current variation of only 8% over the entire input voltage and temperature, thereby providing a stable light source for high quality photos. In flash mode, the device can output 700mA current up to 350ms or 500mA current up to 500ms, with a full current adjustment during the entire flash period.

Power management products Semtech, vice president of marketing Ven Shan said that with the emergence of 3G and smart phone manufacturers to high quality images in their system installed high current LED flash, SC618 with innovative features are emphasized requirements for high current flash system, 1X spotlight mode and current adjustment performance make the SC618 charge pump to provide the best optimization for flash applications.

SC618 3 mm x 3mm MLPD-UT-10 provides a lead-free package size is only the size of only 0.6 mm, available in the most thin and the smallest portable equipment. The highly integrated nature provides a fully flash power solution with a LED and 5 other components, thus reducing the cost and accounting for less board space.