This paper proposes a three-level buck converter utilizing a Digital-to-Analog Converter (DAC)-based flying capacitor voltage control technique, which controls the voltage on a flying capacitor with a differential difference amplifier and common mode feedback circuit for stable operation. Employment of the DAC-based flying capacitor voltage control circuit allows the proposed circuit to compensate for the inductor voltage error as the load current varies. The proposed three-level buck converter was implemented with a CMOS 180 nm standard process. The measurement results demonstrate the wide range of the input and output voltage from 2.7 V to 3.6 V and 0.7 V to 2.4 V, respectively. The proposed three-level buck converter achieved the peak power efficiency of 91% and output ripple voltage of 32.5 mV at the switching frequency of 2 MHz and load current range of 10 mA to 400 mA.

本文提出了一种三电平降压转换器，该转换器利用基于数模转换器（DAC）的飞跨电容器电压控制技术，该技术通过差分差动放大器和共模反馈电路来控制飞跨电容器上的电压，以实现稳定工作。采用基于DAC的快速电容器电压控制电路可使所提出的电路在负载电流变化时补偿电感器电压误差。拟议的三级降压转换器采用CMOS 180 nm标准工艺实现。测量结果表明，输入和输出电压分别在2.7 V至3.6 V和0.7 V至2.4 V的宽范围内。提出的三级降压转换器实现了91％的峰值功率效率和32％的输出纹波电压。