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In this study, a gain scheduling control scheme for DC/DC converters is proposed to improve the transient response to load current step inputs with high slew rate. The proposed control scheme is designed with pole-zero cancellation method to adaptively auto-tuning parameters of the compensator for efficiently improving the output transient response. The adaptive voltage position (AVP) function is also included in multiphase buck converter for voltage regulator (VR) application to verify the proposed gain scheduling scheme. Owing to the improved transient response, output capacitance can be significantly reduced with the proposed scheme. The proposed gain scheduling scheme is implemented on single-phase and multiphase DC/DC synchronous buck converter by 12 V input, 1.2 V output, individually. Simulation and experimental results are presented to demonstrate the effectiveness of the proposed scheme.