High Efficiency Buck Converter with Wide Load Current Range using Dual-Mode of PWM and PSM

This paper presents a high efficiency buck converter with wide load current range. To improve the efficiency in wide load current range, the dual-mode of PWM and PSM is utilized. The proposed design is implemented with a typical 0.35 μm CMOS process. The peak efficiency is simulated to be 96.76% at load current of 1000 mA. Moreover, the efficiency is higher than 94.80% at the wide load current range from 10 mA to 1000 mA. Besides, the proposed design is switched smoothly between PWM and PSM by effective and reliable control logic circuit.