In this paper, a new multi-phase interleaved dc/dc converter is presented. The proposed converter consists of two symmetric sections. Each section consists of several switches, inductors, diodes, and capacitors. In order to obtain high voltage gain, the proposed converter can be extended to n stages of voltage multiplier units which are used between the phases. Hence the voltage gain of the proposed transformer-less converter will be significantly high. In addition, not only the other advantage of the proposed converter contains lower voltage stress on the semiconductors but also leads to high efficiency for different values of duty-cycles. The value of input current ripple is low due to using the interleaved technique. To illustrate the merits of the presented converter, comparison results with other converters are provided. The principle of operation in 3-phase case, both theoretical analysis and experimental results of two prototype in different ranges with operating at 25 kHz are provided.