Design and Implementation of Multiple-Supply Reconfigurable Switched-Capacitor DC-DC Step-Down Regulator
| Autor: | Chih-Yang Huang, 黃智揚 |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 Switch-capacitor (SC) step-down converter circuits are good for applications of different electronic systems, because it has the characteristics of high energy density on a small chip size. As the rapid growth of electronic products, the trend of SC step-down circuits is high-speed, low-cost and enhancement of power conversion efficiency. It is a good candidate for applications in battery powered wearable devices. In this thesis, a multiple-supply reconfigurable switched-capacitor DC-DC step-down regulator with 520pF flying capacitance built in the chip was designed using the 0.18μm CMOS standard logic process. The step-down converter is based on the SC topology with Pulse Frequency Modulation (PFM) to regulate the output voltage. The proposed SC circuit with PFM has variable conversion ratios to achieve high conversion efficiency, large output voltage range and good load regulation. Besides, the 4 parallel step-down SC branches reduce the output ripples. The SC step-down regulators reported so far have either the input or output voltages varied in a specific range. Here, the SC step-down regulator were designed more flexible with both input and output voltages varied in a specific range. The supply voltage range can be 2.5V to 3V, while the output voltage is regulated to 0.8V and up to 1.3V. This circuit can generate maximum output current 31mA with output voltage of 1V at supply voltage of 3V. When it is operated at 2.8V for output voltage of 1.2V and output current of 5.5mA, the maximum power conversion efficiency reaches 70%. Because the specifications and processes of the circuits in literature are different, if the normalized output current is defined as the output current divided by the clock frequency and flying capacitance, we can get the highest normalized output current. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|