康昊鹏, 王霄飞, 金晶. 电导调制的相减拓扑可重构多相开关电容DC-DC[J]. 微电子学与计算机, 2021, 38(7): 13-17.
引用本文: 康昊鹏, 王霄飞, 金晶. 电导调制的相减拓扑可重构多相开关电容DC-DC[J]. 微电子学与计算机, 2021, 38(7): 13-17.
KANG Haopeng, Wang Xiaofei, Jin Jing. Subtraction topology reconfigurable multiphase switched capacitor DC-DC converter with conductance modulation[J]. Microelectronics & Computer, 2021, 38(7): 13-17.
Citation: KANG Haopeng, Wang Xiaofei, Jin Jing. Subtraction topology reconfigurable multiphase switched capacitor DC-DC converter with conductance modulation[J]. Microelectronics & Computer, 2021, 38(7): 13-17.

电导调制的相减拓扑可重构多相开关电容DC-DC

Subtraction topology reconfigurable multiphase switched capacitor DC-DC converter with conductance modulation

  • 摘要: 提出了相减模式的可重构多相位开关电容DC-DC变换器,实现1/2和2/3两种转换比.在2/3模式下,利用减法拓扑降低了传统串并联架构中的寄生损耗.给出了多相位开关电容DC-DC在脉冲频率调制下的环路小信号模型;提供了开关频率和开关管尺寸在给定负载条件下的最佳选择方案.采用比较器实现了开关管尺寸的自适应调制,进一步提升了效率.仿真结果显示:基于40 nm工艺,该变换器的输入电压为2.2 V,环路带宽达到了20 MHZ,瞬态响应的恢复时间为40 ns;变换器在1/2模式下,达到了85.2%的峰值效率和280 mW/mm2的功率密度;在2/3模式下,达到了83.7%的峰值效率和320 mW/mm2的功率密度.

     

    Abstract: A subtraction topology of the reconfigurable multiphase switched capacitor DC-DC converter is presented to realize the conversion ratios of 1/2 and 2/3. In 2/3 mode, the parasitic loss of the serial-parallel topology is reduced by the subtraction topology. This paper presents the small signal model of the multiphase switched capacitor DC-DC converter loop under PFM control, which provides the optimal selection scheme for the switching frequency and the size of the transistors at a given load condition. The comparator is adopted to realize the adaptive modulation of the conductance of the transistors to further improve the efficiency. The simulation results show that under 2.2 V input voltage in the TSMC-40nm process, the proposed converter achieves 20 MHz bandwidth. The recovery time of the transient response is 40ns. In 1/2 mode, this converter achieves the peak efficiency of 85.2% and the power density of 280 mW/mm2. In 2/3 mode, the peak efficiency is 83.7% and the power density is 320 mW/mm2.

     

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