This paper presents a modified buck converter with multiple output circuit and its analysis. This Single Input Multiple Output (SIMO) buck converter has attracted researcher heart as this simple circuit can be harness its benefits especially for those that love outdoor activities as this circuit can charge multiple devices with specific current demand. With the proposed topology, the circuit can promise to constant charge using two separated load or USB devices. However, some study needs to be made as to understand the behavior of the circuit completely in terms of the component selection and the impact of faulty selection of duty cycle control. This study is simulated using PSIM software. The results of the analysis are presented in a proper comparison for a better understanding of the operation.