具輕載效率改善與輸出漣波抑制之寬負載雙模升壓型穩壓器

Abstract

近年來，可攜式產品成了消費者最受歡迎的商品，而其市佔率也是急速的上升，可以說進入了手持式裝置的時代，而在手持式裝置幾乎都依賴電池的供電下，因此，針對各種電池的供應電壓進行電壓轉換也成了重要的課題，而本研究也致力於實現各種可應用於可攜式產品的直流轉直流轉換電路(DC-DC Converter)。 考量到輸出電壓要能因應不同情況負載，本論文提出一採用雙模式高效率切換式升壓穩壓器，且使用晶片內電流感測電路來增加效率。所設計之穩壓器可以再輸入端2.7V至3.3V都可以將電壓輸出至5V，並且在所設定的負載範圍內(10mA~500mA)達到效率90%以上。另外還加入了導通時間調變電路，用來抑制輸出漣波。 本論文所呈現之晶片皆使用台積電所提供之0.35微米2P4M 的標準互補式金氧半製程來完成，電路晶片面積為1.647mm×1.647mm。

In recent years, portable products have become the most popular commodity for consumers, so the market share has been rising rapidly. Because handheld devices rely on the battery power, therefore, the voltage conversion for a variety of batteries has become an important issue. This thesis also committed to the various DC-DC converters for portable products. The output voltage might become unstable due to load or supply voltage variations, which might cause abnormal operation or deteriorate the performance of the portable device. This thesis presents a dual mode boost DC-DC converter to achieve high efficiency. The converter uses the on-chip current sensing technique to increase efficiency and reduce the compensation complexity. The output voltage is 5 V while the input voltage ranges from 2.7 V to 3.3 V. The average conversion efficiency is about 90% and the maximum load current is 500mA. Using different on time in PFM mode, the output ripple can be reduced than other art.. The chips presented in this thesis were fabricated by Taiwan Semiconductor Manufacturing Company （TSMC）0.35μm 2P4M 3.3V mixed‐signal CMOS process. The chip area is 1.647mm×1.647mm.