The XR3403D is a RoHS-compliant DC-DC converter manufactured by XySemi in a SOT-23-6 package. It is a step-down, low-noise, voltage regulator that is designed to provide a precisely regulated output voltage from a wide input voltage range. It is optimized for low quiescent current, low noise, and high efficiency. It can handle output currents up to 800mA, and it is designed for use with ceramic capacitors. It is capable of a wide input voltage range up to 18V. It has an adjustable output voltage range of 0.8 to 5.3V as well as preset 3.3V and 5V output voltages. Additionally, it features input reverse polarity protection. The XR3403D is suitable for a wide variety of applications such as consumer electronics, industrial electronics, and automotive electronics.