The XC9111C421MR-G is a switching voltage regulator manufactured by Torex Semiconductor. This chip is a DC-DC switching regulator, meaning it can convert a DC input voltage into a DC output voltage of a specific value. The XC9111C421MR-G is a high-efficiency, ultra-compact, low-noise voltage regulator, suited for a wide range of applications requiring high stability and reliability. It features an output voltage range from 0.9V to a maximum of 4.5V, with an adjustable switching frequency from 100kHz up to 1MHz. It also includes short-circuit protection, over temperature protection, and over current protection. With its advanced and high-reliability design, the XC9111C421MR-G provides users a cost-effective solution for achieving efficient power conversion.