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This article suggests a cascade output voltage regulation strategy for DC/DC boost converters that embeds a robust inner-loop current controller against the parameter variations. The contributions of this study are divided into two parts; the first is to present a simple, robust inner-loop current controller despite the parameter uncertainties, guaranteeing the stability of the whole closed-loop system including the first-order internal dynamics. The second is to show that the outer-loop PI regulator can stabilize the output voltage error, without relying on any parameter information. Simulations and experiments using a 3−kW DC/DC boost converter showed that the proposed method offers satisfactory closed-loop performance in the presence of parameter uncertainties.