This application note details how to design a white LED torch application using a high frequency DC-DC buck converter that combines small size and efficient light conversion. This converter supplies voltages from 0.9 V to 3.3 V via an external resistor divider and provides up to 1 amp of power, which is ideal for battery-powered lighting applications that require high current with lower forward voltages, such as flashlights, bicycle lighting, and solar-powered lights.