The SKY81299 is a high-efficiency, 2.4 A high-current boost converter with two independently programmable constant current outputs. The device is intended for LED photo flash/facial recognition and “selfie” front-facing camera flash applications in all single-cell Li-ion powered portable products. The SKY81299 maintains the flash LED output current using a DC-DC step-up converter with a bypass function to maximize efficiency under all load conditions. The flash current for each channel can be programmed up to 1.5 A at 12 mA step. The device uses a common cathode (current source) topology to allow a direct flash LED cathode connection to the ground plane which facilitates LED heat dissipation. The total combined output current for flash outputs is 2.4 A.

The high-frequency 2.75 MHz DC-DC boost switching frequency allows the use of a small external inductor and output capacitor, which makes the SKY81299 ideally suited for small batterypowered applications. A startup control circuit automatically senses the flash LED forward voltage at any programmed output current setting and determines the most efficient operation mode.

An industry standard I²C digital interface is used to program the SKY81299 LED Flash and Movie modes. Device operations are fully configurable; Movie and Flash current level, current limits, and fault reporting are managed through I2C. Also included are separate flash enable inputs to initiate the flash operation and a flash inhibit input either to reduce the flash current to Moviemode levels or to shut off the flash current during high battery demand conditions.

The SKY81299 is available in a small 1.903 x 1.903 x 0.605 mm, 16-bump Wafer-Level Chip Scale (WLCSP) package.