隨著在系統單晶片（System on Chip, SoC）手持式裝置的發展，電源供應需要符合大電流驅動能力、高效率、快速暫態響應與小面積等等特性，因此，多相位控制架構更有優勢於單相位。本論文提出具寬負載範圍高效率之多相直流直流轉換器，利用定導通時間控制之優勢來達到快速暫態響應與藉由改變電晶體大小、頻率與相位數量來改善效率，最後使寬負載下都有較好的效率曲線。本晶片以TSMC 0.18μm 1P6M CMOS製程來實現，含PADs之晶片面積為2.5×1.515 mm2。其轉換器之操作頻率為2MHz， 輸入電壓範圍為3V-3.6V，輸出電壓範圍1.8V，負載電流範圍10mA~2000mA，外接電感與電容分別為2.7μH與10μF，輸出電容之等效串聯電阻為15mΩ。當負載電流為300 mA時，其最大改善效率可達25%。

For a system-on-chip (SoC) of mobile device, the power supply is required to have driving capability of high current, high efficiency, fast load transient, small area and so on. Wide Load Range High Efficiency Multiphase DC-DC Converter is presented in this paper. By advantage of constant on time control achieve fast transient response and By using adjustable area of mosfet, frequency and numbers of phases improve efficiency. Finally, the figure of efficiency can get better curve in wide load.The chip is implemented in TSMC 0.18μm 1P6M CMOS process. The chip area including PADs is 2.5×1.515 mm2. The specifications of the converter are the input voltage range of 3V~3.6V, output voltage of 1.8V, switch frequency of 2 MHz, current range of 10mA~2000mA. The off-chip inductance and capacitance are 2.7 μH and 10 μF, respectively. ESR of the output capacitance is 15 mΩ. When converter current is set as 300mA, the efficiency improved is up to 25%.

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