The proposed Multi input DC-DC converter topologies are introduced for two input energy sources. The converters have the capability to simultaneously deliver power to the load, from the input energy sources. The major advantages of the improved converter as compared to the basic topology are its capability to perform the buck, boost and buck-boost modes of operation using the same structure and the ability to deliver power to the load, even with the failure of any one of the input energy sources. Hence the detailed software simulation of the improved converter has been performed using MATLAB/Simulink platform. The state topology is individually presented from the buck; boost and buck boost operation of converter which indicates the integration of two renewable energy sources. The proposed converters have certain merits like less component count, compact structure and efficient energy utilization, compared to existing converter topologies which are already reported in the literature.