The output overshoot of the DC-DC buck converter observed during the startup of the input residual voltage affects the life of the back-end stage or even damages the back-end equipment. In this study，we proposed a fast response network from the feedback voltage to the inductor current to overcome this issue. The proposed network rapidly pulls down the output of the error amplifier once the output voltage reaches the rated value，significantly suppresses the peak inductor current within a single switching cycle，quickly eliminates the overshoot trend caused by the input voltage surge，and ensures the safety of the back-end loads. Furthermore，the proposed structure has an anti-false-touch function. The proposed fast feedback structure was fabricated using a 180 nm process. The measurement results indicate that in typical applications，the output voltage overshoot is approximately 115 mV when the VIN recovery speed is 1 V/5 μs. When compared with the conventional structure without fast feedback network，the output voltage overshoot amplitude is 480 mV，which is reduced by approximately 76%，and the transient response speed is significantly improved.