TY - GEN
T1 - A High-Efficient DC-DC Buck Converter with Adaptive Constant On-Time Control
AU - Xu, Jiaxiu
AU - Fang, Yun
AU - Zhang, Shengjian
AU - Zhao, Chun
AU - Gao, Hao
N1 - Publisher Copyright:
© 2025 IEEE.
PY - 2025
Y1 - 2025
N2 - This paper presents a DC-DC Buck converter featuring an adaptive constant on-time (ACOT) control technique, designed to maintain high efficiency across a wide load range for Internet of Things (IoT) applications. The converter utilizes a voltage feedback loop to maintain a stable 3.3V output voltage and ensure fast transient response. Additionally, a current-sensor-based feedback loop detects load changes to maintain system stability and efficiency. The ACOT control block dynamically adjusts between modes to optimize efficiency under varying load conditions. Implemented in 0.18 μm BCD technology, the proposed converter occupies 0.63 mm2 of silicon area. Operating with a nominal 5V input, it supports an output load current range of 10 μA to 2A, maintaining efficiencies above 90% and achieving a peak efficiency of 97% at a 500kHz switching frequency. With automatic mode transitions, output ripple remains below 20mV under a 5V input, ensuring performance stability across operating conditions.
AB - This paper presents a DC-DC Buck converter featuring an adaptive constant on-time (ACOT) control technique, designed to maintain high efficiency across a wide load range for Internet of Things (IoT) applications. The converter utilizes a voltage feedback loop to maintain a stable 3.3V output voltage and ensure fast transient response. Additionally, a current-sensor-based feedback loop detects load changes to maintain system stability and efficiency. The ACOT control block dynamically adjusts between modes to optimize efficiency under varying load conditions. Implemented in 0.18 μm BCD technology, the proposed converter occupies 0.63 mm2 of silicon area. Operating with a nominal 5V input, it supports an output load current range of 10 μA to 2A, maintaining efficiencies above 90% and achieving a peak efficiency of 97% at a 500kHz switching frequency. With automatic mode transitions, output ripple remains below 20mV under a 5V input, ensuring performance stability across operating conditions.
KW - Adaptive Constant On-Time
KW - current mode
KW - DC-DC buck converter
KW - High-Efficiency
UR - https://www.scopus.com/pages/publications/105010594971
U2 - 10.1109/ISCAS56072.2025.11043494
DO - 10.1109/ISCAS56072.2025.11043494
M3 - Conference Proceeding
AN - SCOPUS:105010594971
T3 - Proceedings - IEEE International Symposium on Circuits and Systems
BT - ISCAS 2025 - IEEE International Symposium on Circuits and Systems, Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2025 IEEE International Symposium on Circuits and Systems, ISCAS 2025
Y2 - 25 May 2025 through 28 May 2025
ER -