| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 97 === More and more battery-powered portable electronic products are introduced to the market in recent years. However, since the battery voltage typically decreases with time, a DC-DC converter is required to convert the time-varying battery voltage to a stable output voltage for the electronic circuits. This work implemented a versatile step-up/step-down dc-dc converter, which can convert a varied input voltage to a fixed 3.3V output voltage. The converter actually consists of a charge-pump-based converter and a low dropout regulator (LDO). Because a clean supply voltage is required for analog circuits, the LDO is included to effectively suppress the output voltage ripple of the charge-pump-based converter.
The die area of the testchip is 1.4×1.4mm2. The chip was implemented by Taiwan Semiconductor Manufacturing Company (TSMC) 0.35μm 2P4M 5V mixed-signal polycide process, patronized by National Chip Implementation Center (CIC). According to the measured result, its input voltage range is 2.5-5 V, and its output voltage ripple is ultra low. The power efficiency is theoretical value approximately. The line regulation of charge-pump converter stage is 12.9mV/V (step-up mode) and 0.23V/V (step-down mode). The load regulation of charge-pump converter stage is about 1mV/mA. The line regulation of LDO stage is 0.8mV/V, and its load regulation is 0.294mV/mA.
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