由於可攜式電子產品的設計朝向多功能智慧型手機發展，將多功能的晶片整合至單一系統上，電源管理晶片的發展因為高轉換效能的技術已經趨於飽和，另一方面，由於電子產品大部分時間處於低功耗狀態，電源管理晶片必須依系統需求調節負載以及輸出電壓位準，才能夠更有效降低系統的功率消耗，因此電源管理晶片具有動態電壓調整的功能成了相當重要的課題。 因應動態電壓調整的系統，在本論文為設計一個具有動態電壓轉換的電流模式與輸出漣波電壓控制降壓穩壓器，其中提出精準電感電流偵測電路取得電感電流變化，適當調整功率電晶體導通週期，調節輸出電壓位準以及提升負載調節度、線性調節度，而當輸出電壓轉換時，則透過所提出的輸出漣波電壓控制與帶差參考電壓的切換，來加速降壓穩壓器即時調節所需輸出電壓的位準、負載電流以及達到快速穩定的效能，在此，相較於傳統的輸出漣波電壓控制，則具有較廣泛的操作電壓以及高轉換效能。 此具有動態電壓轉換的電流模式降壓穩壓器是以TSMC 0.35 um 3.3V 2P4M CMOS製程實現，此晶片的工作電壓範圍為1.6 V ~ 4.9 V，操作頻率為1 MHz，提供1 V至1.8 V之間的輸出電壓轉換，在外部電感10 uH以及外部電容10 uF情況下，轉換時間為50 us，而可供應負載電流範圍為0.05 A~0.5 A，而轉換效能可達到95.5%，線性調節度為5.83 mV/V，負載調節度為0.04048 mV/mA，而晶片面積為1.44 mm2。 The design of portable electronic devices is toward to the multi-function intelligent cell phone. When all functions integrated to one system, the power management is very important. On the one hand, the high transfer efficiency power chip design has been developed very well. On the other hand, according to most of the time, the electronic device is operated in low-power mode, the power management chip must adjust its loading and output voltage level according to the needs. Hence, it can lower the power consumption much more efficiently. As the result, the power management chip with dynamic voltage adjustment has become an important research topic. In the thesis, the proposed current mode buck converter with output-ripple voltage could be operated for dynamic voltage scaling and has better load regulation, better line regulation, and faster transient response when the output voltage steps up or load current changes suddenly. Unlike conventional output-ripple-voltage control buck converter, the proposed buck converter operates in a wide-range voltage and higher conversion power efficiency. A high efficiency current sensing buck converter with output-ripple-voltage control for dynamic voltage scaling has been implemented with TSMC 0.35 um 3.3 V 2P4M CMOS process. Measurement results show that the buck converter can be operated at 1 MHz with supply voltage from 1.6 V to 4.9 V. The output voltage can step up and down between 1 V and 1.8 V in 50 us with 10 uH off-chip inductor and 10 uF off-chip capacitor. The maximum conversion power efficiency for load current from 50 mA to 500 mA is up to 93.6%. The load regulation and line regulation are 0.04048 mV/mA and 5.83 mV/V, respectively. The chip area is 1.44 mm2.
