A Subthreshold Cross-Coupled Hybrid Charge Pump for 50-mV Cold-Start
A Subthreshold Cross-Coupled Hybrid Charge Pump for 50-mV Cold-Start
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DOI：
10.1109/access.2020.3032452
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发表时间：
2020-01-01
期刊：
影响因子：
3.9
通讯作者：
Palumbo, Gaetano
中科院分区：
文献类型：
--
作者：
Ballo, Andrea;Grasso, Alfio Dario;Palumbo, Gaetano
本文提出了一种基于Dickson电荷泵的全集成开关电容DC-DC转换器，它能够工作在迫使晶体管工作在亚阈值区域的输入电压水平。该拓扑利用电荷转移开关中的电阻来克服工作在亚阈值区域的传统解决方案的局限性。采用28 nm FD-SOI工艺的版图后模拟结果表明，该CP可以将低至50 mV的输入电压提升到270 mV的最大输出电压，使建立时间比传统的双支路交叉耦合电荷泵低约25倍，电压转换效率高于76%。所提出的拓扑结构特别适合于由热电发电机提供的电源管理单元的启动。
In this article, a fully-integrated switched-capacitor DC-DC converter based on a Dickson charge pump able to work with input voltage levels that force the transistors working in subthreshold region is presented. The proposed topology exploits resistors in the charge transfer switch in order to overcome the limits of conventional solutions when working in the subthreshold regime. Post-layout simulations using a 28-nm FD-SOI technology show that the CP can boost an input voltage as low as 50 mV to a maximum output voltage of 270 mV, keeping a settling time about 25X lower than the conventional dual-branch cross-coupled charge pump and a voltage conversion efficiency higher than 76%. The proposed topology is particularly suited for the start-up of power management units supplied by thermoelectric generators.