A 94.5% Peak Efficiency, 14mV Output Ripple SC-Buck Step-Up Converter with 1.2-to-5V Output Achieving 20.2% Enhanced Power Efficiency in New PMU Architecture for SoCs

Zhuoqi Guo, Yongchao Zhang, Meiling Hu, Zhongming Xue, Li Geng
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Abstract

For SoC and IoT systems, conventional power management unit (PMU) uses Buck converter and LDOs. With the increase of load current consumed by the digital circuits, the overall efficiency of the conventional architecture deteriorates due to the drop-voltage of the LDO. A new PMU architecture is proposed in this paper to break through the bottleneck of efficiency. The LDO is removed and a step-up converter provides the high voltage for the analog domain. The supply efficiency of the whole SoC could be improved because no LDO is needed for the current-hungry digital circuits. The new step-up converter named switched capacitor Buck (SCB) converter is presented by adding the switched capacitor network in the Buck converter. The most notable feature of SCB converter is that it achieves the step-up conversion with the Buck-like mode. It means that the transfer function, loop design, output ripple, and other characteristics are almost same as Buck converter, which help the implementation of proposed PMU. A prototype is implemented with a standard 0.18-μm CMOS technology. The whole system achieves high power efficiency of 94.5% For the system's power supply efficiency of SoC, the proposed PMU improves the efficiency by at least 12.5% than that of the conventional scheme.
94.5%峰值效率,14mV输出纹波sc -降压升压转换器,1.2至5v输出,在新的soc PMU架构中实现20.2%的功率效率提升
对于SoC和物联网系统,传统的电源管理单元(PMU)使用Buck转换器和ldo。随着数字电路负载电流消耗的增加,由于LDO的降电压,传统架构的整体效率下降。为了突破效率瓶颈,本文提出了一种新的PMU结构。LDO被移除,一个升压转换器为模拟域提供高电压。由于电流饥渴型数字电路不需要LDO,因此可以提高整个SoC的供电效率。通过在Buck变换器中加入开关电容网络,提出了一种新的升压变换器——开关电容Buck变换器。SCB变换器最显著的特点是采用buck模式实现升压转换。这意味着传递函数、环路设计、输出纹波和其他特性几乎与Buck变换器相同,这有助于所提出的PMU的实现。样机采用标准的0.18 μm CMOS技术实现。对于系统SoC的供电效率,所提出的PMU比传统方案的效率提高了至少12.5%。
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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