A high-efficiency high-power BUCK converter based on fully N-type power transistors

The power consumption of power transistors is a key factor affecting the efficiency of DC-DC converters, especially in high-power applications. With regard to higher speed and lower power consumption with smaller area, N-type MOSFETs are superior to P-type ones. A high-efficiency high-power BUCK converter with fully N-type power transistors is presented in this paper with a wide input range of 4.5V-23V. Besides, the relative ground concept is introduced to reduce the design complexity of pulse-width-modulation (PWM) controller module, and further improve the performance of the converter. The proposed converter has been validated with a standard 0.35 μm BCD technology. The results demonstrate that the converter efficiency is up to 95%within 3A output current.