| Summary: | 碩士 === 國立交通大學 === 電機學院IC設計產業專班 === 98 === Recently, portable devices such as mobile phones, GPS, PDAs and digital cameras have become necessities of life, the mainstream of the market of electronic products. In order to extend the battery life of these battery-powered multimedia devices, high-efficiency power management techniques are urgently demanded.
One intuitive method is to use all the battery energy. Since the input voltage of battery might be higher or lower than the input voltage, the DC - DC converter must be able to work in a wide input voltage range. Therefore, the buck-boost converter is a solution.
This thesis proposes an application of portable devices in the battery supply system with high efficiency and smooth switching modes of current-mode buck boost DC - DC converter, to achieve cost savings, reduce the size, integrated high goals. Controller detects the current battery voltage and output voltage set their own modulation in buck, boost, and the mode conversion period of the output voltage stable and not affected. This converter is implemented in TSMC 1P3M 0.25-μm CMOS technology. The input voltage ranges from 2.7 to 4.8V for Li-ion battery and the load current range from 50mA to 400mA. In addition, the switching frequency is designed as 1 MHz.
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