8.1 A 93.8% Peak Efficiency, 5V-Input, 10A Max ILOAD Flying Capacitor Multilevel Converter in 22nm CMOS Featuring Wide Output Voltage Range and Flying Capacitor Precharging
8.1 A 93.8% Peak Efficiency, 5V-Input, 10A Max ILOAD Flying Capacitor Multilevel Converter in 22nm CMOS Featuring Wide Output Voltage Range and Flying Capacitor Precharging
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8.1%20A%2093.8%%20Peak%20效率，%205V输入，%2010A%20Max%20ILOAD%20Flying%20Capacitor%20Multilevel%20Converter%20in%2022nm%20CMOS%20Featureing%20Wide%20Output%20Voltage%20Range%20and %20飞行
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
V. De
中科院分区：
文献类型：
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作者：
C. Schaef;Sheldon Weng;Beomseok Choi;William J. Lambert;K. Radhakrishnan;K. Ravichandran;J. Tschanz;V. De
由于不断增加的电流需求、不断缩小的外形尺寸以及高度动态的负载模式，计算soc的功率传输已成为一个主要挑战。传统的电感拓扑结构如降压变换器仍然需要大的电感，因为开关频率不能在不降低效率的情况下增加。因此，变换器的尺寸很难缩放，瞬态响应也很慢。另一方面，开关电容转换器（scc）有望实现小尺寸，并提供快速瞬态响应，因为它们不需要大型电感。然而，SCCs只能在固定的转换率下实现高效率，从而限制了它们的使用，因为SoC平台需要宽范围的连续输入和输出电压。混合转换器提供传统buck和SC拓扑[1]-[3]的综合优势。它们可以通过显着降低电感和电容要求来提供卓越的功率密度和效率。由于它们使用像SCCs这样的堆叠低压晶体管，因此可以在不降低效率的情况下实现更高的开关频率。此外，通过电感器对飞行电容器进行软充电，消除了纯scc中存在的电荷共享损失。
Power delivery for compute SoCs has become a major challenge due to increasing current demands, shrinking form factors, as well as highly dynamic load patterns. Traditional inductive topologies like buck converters still require large inductances since switching frequencies cannot be increased without degrading efficiency. As a result, converter sizes are difficult to scale and transient responses are slow. On the other hand, switched capacitor converters (SCCs) are promising for small form factors and offer fast transient response since they do not require large inductors. However, SCCs can achieve high efficiency only at fixed conversion ratios, thus limiting their usage since a wide continuous range of input and output voltages are needed in SoC platforms. Hybrid converters offer the combined benefits of conventional buck and SC topologies [1]–[3]. They can provide superior power density and efficiency by reducing both inductance and capacitance requirements significantly. Since they use stacked low voltage transistors like SCCs, higher switching frequencies can be achieved without degrading efficiency. In addition, soft-charging of the flying capacitors through the inductor eliminates charge-sharing losses present in pure SCCs.