Control of Dc-Dc boost converter is a complex task due to the nonlinearity inherent in the converter and introduced by the external changes. A robust sliding mode controller for the control of Dc-Dc boost converter were described in this study. Dynamic equations describing the boost converter are derived and sliding mode controller is designed. The robustness of the sliding mode controlled boost converter system is tested for step load changes and input voltage variations. The computer-aided design software tool Matlab/Simulink is used for the simulations. The simulation results are presented. The simulation results show a fast dynamic response of the output voltage and robustness to load and input voltage variations.