現今社會可攜式電子產品蓬勃發展，如何延長電子產品的使用時間已成為一個重要的議題。由於電池的輸出電壓通常會隨著時間下降(以鋰電池為例：其輸出電壓於2.7 V~4.2 V之間)，電壓可能比電子產品所需要的電壓高或低(例如，3.3V)。因此，採用非反向升降壓型直流-直流轉換器即可完整利用電池輸出電壓範圍。本論文將介紹一個以平均電流模式控制之非反向升降壓型直流-直流轉換器，有高的轉換效率、快速的暫態響應、以及良好的抗雜訊能力。另外，本論文提出一改良的電感電流偵測電路，能減少感測訊號的雜訊以提升系統穩定性。
此晶片使用台灣積體電路公司0.35μm 2P4M 5V混合訊號製程，尺寸為2.3×1.86mm2。於輸入電為2.5~5V、輸出負載電流為50~300mA時，輸出電壓均可穩定於3.3V。

Due to the growth of consumer electronics market, there are more and more studies in energy saving to prolong service life of electronic products. Because the output voltage of batteries decreases with time (e.g., Li-ion: 2.7–4.2 V), it may be higher or lower than the required supply voltage (e.g., 3.3V). To use the entire battery output voltage range, a non-inverting buck-boost dc-dc converter is a good choice. In this work, an average-current-mode non-inverting buck-boost dc-dc converter with the advantages of high power efficiency, faster transient response, and excellent noise immunity is introduced. Furthermore, a novel current sensing scheme, which can reduce noise and then improve system stability, is proposed.
The die area of this chip is 2.3x1.86 , which is fabricated by using Taiwan Semiconductor Manufacturing Company (TSMC) 0.35μm 2P4M 5V mixed-signal polycide process. The converter output is regulated to 3.3V, when the loading current is 50 mA to 300 mA and the input voltage is 2.5V to 5V.

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