What question did this study set out to answer?

This research aims to develop a sensorless buck converter that operates with fast transient response and high efficiency.

May 25, 2026Open Access

A Sensorless Adaptive On-Time Control Buck Converter with Fast Transient Response

Key Points

This research aims to develop a sensorless buck converter that operates with fast transient response and high efficiency.
Implemented a buck converter using adaptive on-time control without inductor current sensing.
Operated at approximately 1 MHz with a 3.0–3.6 V input range and a 1.5–2.5 V output range.
Conducted simulations to evaluate performance in terms of voltage undershoot, overshoot, and recovery times.
Achieved undershoot and overshoot voltages of 23 mV and 36 mV, respectively.
Reported recovery times of 1.66 µs and 2.94 µs for undershoot and overshoot.
Demonstrated peak efficiency of 97.71% with switching-frequency variation limited to ±3%.

Abstract

This paper presents a sensorless Adaptive On-Time (AOT) controlled buck converter that achieves fast transient response without inductor current sensing. The converter operates at approximately 1 MHz with reduced switching-frequency variation over a 3.0–3.6 V input range, a 1.5–2.5 V output range, and load currents from 100 mA to 500 mA. The proposed converter is implemented in a UMC 0.18-µm 1P6M CMOS process with a chip area of 798.66 × 614.3 µm2. Simulation results show undershoot and overshoot voltages of 23 mV and 36 mV, with recovery times of 1.66 µs and 2.94 µs, respectively. The switching-frequency variation is limited to within ±3%, and the peak efficiency reaches 97.71%.

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Cite This Study

Chou et al. (Thu,) studied this question.

synapsesocial.com/papers/6a13e6b30e02ee3982d31988 https://doi.org/https://doi.org/10.1587/elex.23.20260184

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