A Monolithic 30uA – 1.5A > 85%-Efficiency, Passive-Ramp-Extended-Ton Controlled Buck Converter For Mobile SoC Fast DVS

2023 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2023-03-19 DOI:10.1109/APEC43580.2023.10131155

Hsaio-Hsuan Chen, Chieh-Ju Tsai, Ching-Jan Chen

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Abstract

In this paper a 2uA quiescent current, passive-ramp (PSR) extended-Ton controlled buck converter IC is proposed for modern mobile silicon-on-chip (SoC) for a longer battery lifetime. From the small signal analysis, the proposed modulation scheme only needs a simple integrator error amplifier for regulation. With so, the trans conduction Gm of type-I integrator can be scaled with the output integrating capacitor and the operating current. Conversely, reducing the quiescent current of the error amplifier sacrifices the transient response especially for the dynamic voltage scaling, which is highly related to the slew rate of the error amplifier. A dynamic biased operational transconductance amplifier with unlimited output current is adopted to solve this issue and halves the settling time. The chip prototype is designed using a TSMC O.18um CMOS process. The post-layout simulation results show a 4MHz switching frequency, 2uA quiescent current, and a loading range from 30uA to 1.5A with > 85% efficiency. The load transient shows an 110m V undershoot voltages with a 1.5A/I00ns current step.

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用于移动SoC快速DVS的单片30uA - 1.5A > 85%效率，无源斜坡扩展吨控制降压转换器

本文提出了一种2uA静态电流，无源斜坡(PSR)扩展吨控制降压转换器集成电路，用于现代移动硅片(SoC)，以延长电池寿命。从小信号分析来看，所提出的调制方案只需要一个简单的积分器误差放大器进行调节。这样，i型积分器的反导通Gm就可以随输出积分器电容和工作电流进行缩放。相反，减小误差放大器的静态电流会牺牲瞬态响应，特别是动态电压缩放，这与误差放大器的摆幅率高度相关。采用无限输出电流的动态偏置运算跨导放大器解决了这一问题，使建立时间缩短了一半。该芯片原型采用台积电0.18 um CMOS工艺设计。布局后仿真结果表明，开关频率为4MHz，静态电流为2uA，负载范围为30uA ~ 1.5A，效率> 85%。负载瞬态显示110m V欠冲电压，电流步进为1.5A/I00ns。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2023 IEEE Applied Power Electronics Conference and Exposition (APEC)

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