| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 96 === Since portable electrical product is rising and flourishing, power management circuits which supply different voltage to different sub blocks are needed. The issues of this kind of power management circuits contain high efficiency, high accuracy, low noise and low cost. Compared with switching regulator, inductor-free charge-pump regulator has the advantage of lower cost. However, the structures of past charge-pump regulator are not regulated or regulated by PWM method. The structures which are not regulated have poor performance of accuracy, and structures regulated by PWM method are under high current stress for its short duration and the noise can’t be filtered easily for its frequency spectrum is not well defined. Our lab proposed current-controlled charge pump regulator several months ago. This kind of structure improves load-regulation magnificently, but it can’t supply voltage higher than input. When the voltage of battery gets lower than input voltage, the battery can’t supply stable output voltage. For this reason, a step-up/step down regulator is proposed. The frequency response of loop gain and the method of compensation and influence of clock have been researched. The design, implementation, testing and verification will also be presented in this report.
The chip is implemented by the process of TSMC 0.35um 2P4M with a die area of 1.462x1.059 mm2. The input voltage of this circuit is set on 2.5V / 5V, and the output voltage is set on 3.3V. The measured results are listed as below. The maximum of load current is 9.2 mA. Measured load regulation is 2.06 mV/ mA, and measured line regulation is 0.15 mV / mA. If the power of active circuits isn’t considered, the efficiency is about 66%. If it is, the efficiency is about 57%.
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