A Dual-mode Buck Converter with Dynamic Sawtooth Voltage for Wide Input Voltage Range Application

Yafei Xie; Xiaowu Cai; Yu Lu; Longli Pan; Jian Lu; Lei Wang; Bo Li

doi:10.1587/elex.21.20240148

Yafei Xie, Xiaowu Cai, Yu Lu, Longli Pan, Jian Lu, Lei Wang, Bo Li

Author information

Yafei Xie
Institute of Microelectronics of the Chinese Academy of Sciences
University of Chinese Academy of Sciences
Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences
Xiaowu Cai
Institute of Microelectronics of the Chinese Academy of Sciences
Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences
Yu Lu
Institute of Microelectronics of the Chinese Academy of Sciences
University of Chinese Academy of Sciences
Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences
Longli Pan
Institute of Microelectronics of the Chinese Academy of Sciences
Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences
Jian Lu
Institute of Microelectronics of the Chinese Academy of Sciences
Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences
Lei Wang
Institute of Microelectronics of the Chinese Academy of Sciences
Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences
Bo Li
Institute of Microelectronics of the Chinese Academy of Sciences
Key Laboratory of Science and Technology on Silicon Devices, Chinese Academy of Sciences

Keywords: Buck Convertor, Pulse Width Modulation (PWM), Pulse Skip Modulation (PSM), Wide Input Voltage Range

JOURNAL FREE ACCESS Advance online publication

Article ID: 21.20240148

DOI https://doi.org/10.1587/elex.21.20240148

Details

Abstract

A dual-mode buck converter with dynamic sawtooth voltage is presented in this paper. The proposed design can handle loads from 10 mA to 1000 mA by utilizing PSM and PWM modes. Moreover, there is hysteresis during mode switching from PWM to PSM to avoid the control mode fluctuating. Dynamic sawtooth voltage is used to address the line transition issue over a wide input voltage range. Implemented in 0.25 μm BCD technology, this converter can generate an output voltage of 5 V with an input voltage range of 10-55 V. The simulated results demonstrate the proper mode transition under step-up/down load current transient. The peak efficiency is 92.57% at 90 mA. The load regulation and line regulation are 1.07 μV/mA and 15.2 μV/V, respectively.

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