| Summary: | 碩士 === 國立臺灣海洋大學 === 電機工程學系 === 101 === Portable electronic devices have developed rapidly in recent years. Also, each sub-circuit of a system requires a different supply voltage. Therefore, power management ICs which can convert the battery voltage to various input voltages for using is needed. A boost regulator circuit with the Li-ion battery input voltage (3.2V~4V) is applied in this thesis. The detector circuit is designed to sense the load-side current variation, and then the modulator circuit is used to adjust switching frequency to achieve the effect of fast steady state, reduce the overshoot voltage of output voltage and recovery time, and improve the transient response. In the protection mechanism, the over current protection circuit and over voltage protection circuit are aimed at making this chip more stable.
The TSMC 0.35um Mixed-Signal 2P4M Polycide 5V process provided by National Chip Implementation Center (CIC) is made use of to devise and implement this study, and all the chip size is 1780um*1661um. The whole system operates with voltage control mode and pulse width modulation. And the rated input voltage is 3.6V (3.2V~4V), the stable output voltage is 5V, the modulation range of switching frequency is between 650KHz and 968KHz, the load current ranges from 30mA to 250mA, the over current protection circuit is offered to prevent the inductor current from exceeding 1A, the over voltage protection circuit is employed to stop the feedback voltage from exceeding 1V. The output ripple is less than 6mV, the line regulation is less than 5.875 (mV/V), the load regulation is less than 0.214 (mV/mA), and the max system efficiency can reach 88.19%.
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