<p>This paper focuses on the accuracy and convergence speed enhancement in the voltage regulation of DC–DC boost converters. To deal with this, this paper presents a combination of a novel non-singular fast terminal sliding mode control (NFTSMC) and sliding mode observer (SMO). In the proposed NFTSMC, a novel reaching law and a novel sliding surface have been proposed. The proposed reaching law has an adaptive form and its parameters are adapted so that the chattering phenomena is minimized. In addition, the presented reaching law has a positive effect on decreasing the convergence time. Besides, a non-singular fast terminal sliding surface is proposed that guarantees that the tracking error converges to zero in a faster way compared to the conventional types. This is mathematically proved. Based on the Lyapunov theory, it is guaranteed and proved that from every initial condition, the voltage tracking error converges to zero in a finite time. Furthermore, to increase the robustness of the proposed method against load changes, a new sliding mode observer (SMO) is designed to estimate the value of loads to inform the controller about load changes to be compensated. The performance of the proposed method has been validated through simulations and experimental tests. Results confirmed the effectiveness of the proposed method in increasing the convergence speed and eliminating the chattering.</p>