Generally analog amplifier's efficiency is very low and size is too big to use mobile IT devices such as MP3, DVD and PMP. On the other hand, class-D amplifier's ideal efficiency is up to 100%. It has various advantages, for example its THD, heat ratio and noise are very lower level than any other amplifier types. And its size is very compactable apt to mobile IT devices. In this study, a design and implementation method for mobile multimedia audio amplifier system applying secondary battery is proposed. Li-Polymer battery is used as secondary battery and PCM(Protection Circuit Module) for the battery is designed. The presented system in this study is useful and applicable for mobile multimedia audio amplifier system.
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