由於科技的蓬勃發展，使得可攜式電子產品日益繁多。而可攜式電子產品幾乎皆使用鋰電池來作為電力來源。因電池電壓會隨使用時間而逐漸下降，為了供給後級電路一穩定電壓，故一個具有體積小且高效率特性之直流-直流電能轉換器是非常需要的。但一般的直流-直流電能轉換器 (ex: Buck、Boost)皆無法完整利用鋰電池的完整輸出電壓範圍(2.7V~4.2V)。本研究針對此情況採用一平均電流模式控制非反向之升-降壓型直流-直流交換式電壓轉換器。此種架構可以涵蓋鋰電池的輸出電壓範圍，並維持高效率且提供輸出穩定電壓(3.3V)。
此晶片所使用製程係使用台灣積體電路公司所提供之0.35μm 2P4M 5V混合訊號製程，面積為2.14×1.92mm2。本轉換器於輸入電壓範圍2.5 V ~ 5 V之間，可以提供50mA~400 mA 的負載電流。

Recently, the portable devices have become more and more popular, and almost all the power supply of the portable devices are using Li-ion battery, but the voltage of battery will decrease with time. To supply a constant voltage, a small-size and high-efficiency dc-dc converter is needed. Basic switching regulators (e.g., buck, boost) are not capable of using the entire Li-ion battery output voltage (2.7-4.2V) range effectively. In this work, an average-current-mode non-inverting buck-boost dc-dc converter is introduced, which can use the full-range output voltage of Li-ion battery.
The die area of this chip is 2.14x1.92 , which was fabricated by using Taiwan Semiconductor Manufacturing Company (TSMC) 0.35μm 2P4M 5V mixed-signal polycide process. The input range is between 2.5V~5V, and it is capable to supply 50mA~400 mA load current.

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