在可攜式電子產品中，大部分鋰電池供電範圍介於2.7~4.2V，對於輸入電壓為3.3V的可攜式裝置內部電路而言，在整個電池的供電範圍中，需要一個同時具有升壓及降壓功能的直流-直流升降壓轉換器，方可達到完整的效率利用。
本論文第一顆晶片實現並驗證了非反向升降壓轉換器具有升壓和降壓的功能。從量測結果可知本晶片可將鋰電池的電壓範圍2.7~4.2V經轉換送出3.6V的輸出電壓給電子元件使用，切換頻率1MHz，負載電流200mA。本晶片使用國家晶片系統中心(National Chip Implementation Center, CIC)提供的TSMC 0.35um 2P4M 3.3V Mixed Signal製程，晶片面積為1.494 x 1.155mm2。
本論文第二顆晶片除了實現非反向升降壓轉換器具升壓和降壓的功能，並提出Continuity mode機制，在升壓和降壓轉換區域中提供平順的模式轉換。解決了傳統在此區域因Pulse skipping所面臨的不連續問題。相較於相關研究提出的Buck-boost mode或Buffer mode，本論文之Continuity模式在每個切換週期從4功率開關減少為僅需利用2功率開關作切換，降低Switching losses；同時此模式就如操作在Buck mode，其電感電流等同於負載電流，亦減少Conduction losses。因此本論文轉換器的整體效能獲得提升，最大轉換效率可達95%。從模擬結果驗證了隨著鋰電池電壓範圍從4.2V下降至2.7V，本晶片可依序通過Buck mode、Continuity mode和Boost mode送出一穩定的輸出電壓3.3V。其切換頻率1MHz，負載電流100~300mA。本晶片使用CIC提供的TSMC 0.18um 1P6M 3.3V Mixed Signal製程，晶片面積為1.4 x 1.5mm2。

In the portable electronic products, most of the Li-ion battery output voltages are between 2.7~4.2V, for supplying electronic devices a regulated voltage of 3.3V, we must design a dc-dc buck-boost converter with boost and buck function to convert power effectively.
The first IC implements a Non-inverting Buck-boost converter with Boost and Buck function. By the measurement results, this IC can supply electronic devices a regulated voltage of 3.6V from Li-ion battery of 2.7~4.2V when the switching frequency is 1MHz and the load current is 200mA. The chip was fabricated by Taiwan Semiconductor Manufacturing Company (TSMC) 0.35um 2P4M 3.3V Mixed Signal polycide process, patronized by National Chip Implementation Center(CIC). The die area of the chip is 1.494 x 1.155mm2.
The second IC implements a Non-inverting Buck-boost converter, which is not only operate in Boost and Buck mode, but also a Continuity Mode (CM) for smooth transition between buck and boost modes. The pulse skipping problem in transition region was solved, thus keep continuity in this region. The proposed technique not only provides smooth transition, but also minimizes the switching and conduction losses. Accordingly the proposed design is better than the conventional Buck-boost or Buffer mode. It is just like to operate in Buck mode, the number of switches used in one switching cycle is reduced from four to two, and the inductor current is reduced to close to the value of load current. Therefore, the efficiency of converter was improved, the maximum conversion efficiency can achieve as high as 95%. By the simulation results, this IC was desired operate in Buck mode, Continuity mode(remove the discontinuity region) or Boost mode to supply electronic devices a regulated voltage of 3.3V according Li-ion battery of 2.7~4.2V when the switching frequency is 1MHz and the load current is 100~300mA. The chip was fabricated by TSMC 0.18um 1P6M 3.3V Mixed Signal polycide process, patronized by CIC. The die area of the chip is 1.4 x 1.5mm2.

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