SC618

The SC618 is a high-current charge pump designed specifically for use with white LEDs used in camera flash applications. Only two small bucket capacitors are required to develop the output drive, providing a low EMI solution compared to inductive boost regulators.

The SC618 has two modes of operation: fl ash mode and spotlight mode. In fl ash mode, the SC618 is capable of delivering 500mA of regulated current for a duration of 500ms or up to 700mA for a reduced duration. A safety timer is also included to ensure the LED cannot be left on indefi nitely and overheat. In spotlight mode the SC618 outputs 40% of the fl ash mode current and can remain enabled continuously.

An external resistor is connected in series with the LED to set the current. In fl ash mode, this resistor can dissipate up to 175mW, reducing the power dissipation requirement of the SC618. The fl ash input overrides the control input to make sure the fl ash function is activated .

The SC618 ultra-thin package provides both a low profi le and high thermal effi ciency.