隨著在系統單晶片(System on Chip, SOC)在手持裝置以及面板的發展下，更小的面積或是更小的電壓、電流漣波以及能夠輸出多組電壓的轉換器需求，本論文提出利用三階層單電感雙輸出的方式以改善此應用場合，主要特色為三階層降壓型轉換器能夠將電流漣波變小，在需要相同大小的漣波下，能夠將電感的大小縮小，達到節省面積的功能，並且使用電壓模式控制加上將電容電壓回授的方式。同時利用單電感雙輸出的方式能夠達到只使用一組降壓型轉換器達到多輸出的方式，取代先前需要做多組轉換器以達到相同效果。
本論文採用TSMC 0.18 μm 1P6M CMOS製程實現，晶片的面積包含內部PADs為2.23×2.2 mm2 。本文輸入電壓為3.3 V，供應電壓為3.3 V以及1.8 V、輸出電壓分別為1.8 V以及1.2 V，切換頻率為2~4MHz，PCB上面外掛電感以及輸出電容分別為1μH與10 μF，輸出負載範圍為200 mA至800 mA。

Development of system-on-chip (SoC, system-on-chip) handheld devices and panel device, converter will want to achieve more smaller area and the ripple of the voltage and current, and need more output voltage to drive the after-stage circuit. This thesis show the method of three-level single inductor dual output, the characteristic of three-level converter is can reduce the ripple of current, when we need the same ripple, it can reduce the area of the inductor, and use flying capacitor feedback voltage mode to control it. Simultaneously, use single inductor dual output method can use one buck converter to reach multiple output.
The chip of this thesis is implemented with TSMC 0.18 μm 1P6M CMOS technology and the size of chip including pads is 2.23×2.2 mm2. The input voltage is 3.3 V, the supply voltage are 3.3V and 1.8V. The output voltages are 1.8 V and 1.2 V, and the switching frequency is 2~4 MHz. PCB layout include the off chip inductance and capacitance are 1 μH and 10 μF. The output load range is 200 mA to 800 mA.

[1] Ming Qin, Jianping Xu, Guohua Zhou and Qingbo Mu, “Analysis and comparison of voltage-mode and current-mode pulse train control buck converter,” 2009 4th IEEE Conference on Industrial Electronics and Applications, 2009, pp. 2924-2928, doi: 10.1109/ICIEA.2009.5138744.
[2] L. L. Chen, J. P. Xu, S. N. Cheng, L. Liu and L. F. Deng, “Stability analysis and AC modeling of high-efficiency BUCK/BOOST converter,” 2008 IEEE International Conference on Electron Devices and Solid-State Circuits, 2008, pp. 1-4, doi: 10.1109/EDSSC.2008.4760746.
[3] Sizhen Li, Xuecheng Zou and Xiaofei Chen, “A nonlinear control buck converter with fast transient response,” Proceedings of the 2009 12th International Symposium on Integrated Circuits, 2009, pp. 45-48
[4] J. Xue, L. Cong and H. Lee, “100-V 2-MHz isolated QSW-ZVS three-level DC-DC converter with on-chip dynamic dead-time controlled synchronous gate driver for eGaN power FETs,” 2015 IEEE Applied Power Electronics Conference and Exposition (APEC), 2015, pp. 451-454, doi: 10.1109/APEC.2015.7104389.
[5] X. Liu, C. Huang and P. K. T. Mok, “A High-Frequency Three-Level Buck Converter With Real-Time Calibration and Wide Output Range for Fast-DVS,” in IEEE Journal of Solid-State Circuits, vol. 53, no. 2, pp. 582-595, Feb. 2018, doi: 10.1109/JSSC.2017.2755683.
[6] L. Chu et al., “10.5 A three-level single-inductor triple-output converter with an adjustable flying-capacitor technique for low output ripple and fast transient response,” 2017 IEEE International
Solid-State Circuits Conference (ISSCC), 2017, pp. 186-187, doi: 10.1109/ISSCC.2017.7870323.
[7] J. P. Rodrigues, S. A. Mussa, M. L. Heldwein and A. J. Perin, “Three-Level ZVS Active Clamping PWM for the DC–DC Buck Converter,” in IEEE Transactions on Power Electronics, vol. 24, no. 10, pp. 2249-2258, Oct. 2009, doi: 10.1109/TPEL.2009.2022535.
[8] E. Bonizzoni, F. Borghetti, P. Malcovati, F. Maloberti and B. Niessen, “A 200mA 93% Peak Efficiency Single-Inductor Dual-Output DC-DC Buck Converter,” 2007 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, 2007, pp. 526-619, doi: 10.1109/ISSCC.2007.373526.
[9] Shuhan Zhou, Guohua Zhou, Duo Xu, Xiang Ran and Shungang Xu, “Voltage-mode variable frequency control for single-inductor dual-output buck converter with fast transient response,” 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia), 2017, pp. 1339-1344, doi: 10.1109/IFEEC.2017.7992238.
[10] X. Liu, P. K. T. Mok, J. Jiang and W. Ki, “Analysis and Design Considerations of Integrated 3-Level Buck Converters,” in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 63, no. 5, pp. 671-682, May 2016, doi: 10.1109/TCSI.2016.2556098.
[11] Kun-Yu Lin, Chun-Shih Huang, Dan Chen and K. H. Liu, “Modeling and design of feedback loops for a voltage-mode single-inductor dual-output buck converter,” 2008 IEEE Power Electronics Specialists Conference, 2008, pp. 3389-3395, doi: 10.1109/PESC.2008.4592479.
[12] M. Belloni, E. Bonizzoni, and F. Maloberti, “On the Design of SingleInductor Multiple-Output DC-DC Buck Converters,” to
[13] Kousuke Miyaji, Yuki Karasawa, Takanobu Fukuoka, “A 92.8% Efficiency Adaptive-On/Off-Time Control 3-Level Buck Converter for Wide Conversion Ratio with Shared Charge Pump Intermediate Voltage Regulator,” IEEE Symposium on VLSI Circuits, 2018