Chip implementation of low-power high-efficient buck converter for battery-powered IOT applications

IF 1.2 4区工程技术 Q4 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE Analog Integrated Circuits and Signal Processing Pub Date : 2024-02-22 DOI:10.1007/s10470-023-02204-5

Shih-Chang Hsia, Ming-Ju Hsieh

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Abstract

IoT and wearable medical devices frequently require ultra-low power solutions that can support long spells of inactivity. This study presents a buck converter to control power stages using a novel pulse frequency modulation (PFM) system that reduces switching losses for low-power systems. The modulation of high and low-frequencies was demonstrated, where the high-frequencies exhibited better energy transformation between the inductor and capacitor, and the low-frequencies could be adjusted for different current loads, to reduce switching losses. This circuit is optimized for light load applications. Using voltage control oscillation (VCO), the frequency range of 0.5 MHz – 2.0 MHz can be adjusted to influence conversion efficiency for different loads. The design was simulated and then fabricated using TSMC 0.18um process. The core size was about 1500 × 1000um that includes power MOS. Measurements result an average conversion efficiency of 91% under a load of 0.1 mA – 10 mA. This chip is suitable for battery-based IoT systems, or wearable medical devices.

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用于电池供电物联网应用的低功耗高效降压转换器的芯片实现

物联网和可穿戴医疗设备经常需要能够支持长时间不工作的超低功耗解决方案。本研究提出了一种降压转换器，利用新颖的脉冲频率调制（PFM）系统控制功率级，降低了低功耗系统的开关损耗。研究演示了高频和低频的调制，其中高频在电感器和电容器之间表现出更好的能量转换，而低频可根据不同的电流负载进行调整，以减少开关损耗。该电路针对轻负载应用进行了优化。利用电压控制振荡（VCO），可以调整 0.5 MHz - 2.0 MHz 的频率范围，从而影响不同负载的转换效率。设计经过仿真，然后采用台积电 0.18um 工艺制造。内核尺寸约为 1500 × 1000 微米，包括功率 MOS。测量结果表明，在 0.1 mA - 10 mA 的负载条件下，平均转换效率为 91%。该芯片适用于基于电池的物联网系统或可穿戴医疗设备。

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来源期刊

Analog Integrated Circuits and Signal Processing 工程技术-工程：电子与电气

CiteScore

0.30

自引率

7.10%

发文量

141

审稿时长

7.3 months

期刊介绍： Analog Integrated Circuits and Signal Processing is an archival peer reviewed journal dedicated to the design and application of analog, radio frequency (RF), and mixed signal integrated circuits (ICs) as well as signal processing circuits and systems. It features both new research results and tutorial views and reflects the large volume of cutting-edge research activity in the worldwide field today. A partial list of topics includes analog and mixed signal interface circuits and systems; analog and RFIC design; data converters; active-RC, switched-capacitor, and continuous-time integrated filters; mixed analog/digital VLSI systems; wireless radio transceivers; clock and data recovery circuits; and high speed optoelectronic circuits and systems.