Abstract: The necessity of higher current and providing a back-up when one unit fail, demands the parallel operation of dc-dc converters. One of the problems of the parallel operating power converters is to regulate the output voltage and equalize the output currents of modules. This study provides the design of sliding mode controller (SMC) for parallel operated DC-DC boost converter. The output voltage regulation and load sharing behaviors are studied for the designed SMC for disturbances viz. line voltage variations of converters, load variation and other circuit components changes. The performance evaluation is done in hardware and MATLAB-Simulink tool finally the results are compared with conventional proportional-integral (PI) controller.