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本文提出一种紧凑型4V输入12A负载的谐振sigma转换器，通过结合10MHz高压侧开关电容降压和5MHz低压侧直接谐振开关电容，实现了93.4%峰值效率和20mV负载阶跃下冲的快速瞬态响应。该设计解决了AI处理器供电中对高电流密度和快速负载变化的需求。
Abstract This work presents a 4V input 12A load resonant sigma converter which consists of a 10MHz high-side switched-capacitor Buck (SCB) and a 5MHz low-side direct resonant switchedcapacitor (ReSC) converter. The proposed converter features a low V·A metric, a compact volume, and more importantly, a fast response by providing an ~0.5A/ns current slew rate during the transient. The measurements show 93.4% peak efficiency, 20mV undershoot under a 6A load step and 0.38A/mm2 system current density. With the great advances in artificial intelligence, the power demand of xPUs has roared rapidly from 100W to 1000W levels, imposing enormous stresses on the power converters for ever higher efficiency, speed, and density (E·S·D). The classic solutions, however, face severe challenges in meeting all the three E·S·D targets at the same time. For example, for the classic Buck converters such as integrated-voltage-regulators (IVR), DrMOS, and 3level converters, wide output range and excellent indu
Yukan Du, Shengdao Ren, Zheyuan Fei, Ziteng Chen, Menglian Zhao, Chushan Li, Yong Ding, Wuhua Li, Zhichao Tan, Wanyuan Qu
Zhejiang University, Hangzhou, China