This application note focuses on the design of a flash LED driver using the STCF05 device, which is a boost current mode converter with an I²C interface and internal current source. The schematic, functional description, recommendations for PCB layout, and external component selection are also discussed in this application note. The STCF05 device is designed to drive two LEDs in series with a total forward voltage range from 5.3 V to 10.2 V.