An efficiency-enhanced circuit for buck converter in discontinuous conduction mode was presented in this paper. Based on the detailed analysis of the critical factors affecting the conversion efficiency, a novel rectifier-driven control scheme was researched. The proposed technique had the function of adaptive dead-time and zero-current detection, for the purpose of maximized efficiency by optimizing the power losses caused by body-diode conduction and reverse inductor current, while taking into account the system power consumption. The circuit had been designed and simulated in a 018 μm BCD process. The simulation results showed that the proposed design achieved a peak efficiency of 966% and a high power conversion efficiency of >90% for load currents greater than 5 mA, when the input and output voltage was 3 V and 15 V respectively.