A 2.5−5MHz 87% Peak Efficiency 48V-to-1V Integrated Hybrid DC-DC Converter Adopting Ladder SC Network with CapacitorAssisted Dual-Inductor Filtering

📋 论文概要

该论文提出一种集成混合DC-DC转换器，采用梯型开关电容网络和电容辅助技术，实现48V到1V的大降压比转换。解决了传统buck转换器在高频下开关时间短、损耗高的问题，以及开关电容转换器仅在固定比率下高效的限制。

💡 主要创新点

• 采用梯型开关电容网络实现大降压比，降低开关管电压应力。
• 引入电容辅助技术，在宽频率范围内优化能量传输，实现高频高效率。
• 将转换器集成化，减少外部元件，适用于CPU/存储器供电。

🏷 关键词

📄 原文摘要

With the rapid developments in big data analytics, non-isolated 48V-to-1V converters offer a competitive choice to support the increased power consumptions in CPUs and memories. For realizing a small output-to-input conversion ratio (CR), the conventional buck (CB) converters suffer from extremely short switch on-time that limits highfrequency operation and incurs high power losses. Although the switched-capacitor (SC) converters with lower voltage rating devices can scale down the high input voltage, VIN, high efficiency can only be achieved under fixed conversion ratios. Hybrid converters are thus emerged recently to combine the advantages of CB and SC converters. Converter topologies such as flying-capacitor multi-level (FCML) [1] and hybrid Dickson (HD) [2] adopt an external output LC filter after the SC network to realize continuous conversion range. However, since flying capacitor in [1] and [2] requires proper voltage balancing

👥 作者与机构

Chen Chen, Jin Liu, Hoi Lee

University of Texas at Dallas, Richardson, TX