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把3V纽扣电池转成2.1V给蓝牙供电，本来是用TPS62730，但是封装太小了，调试维修都不方便，
要求就是输出2.1V的（重要）封装尽量不要太小，能够手工焊接替换的
还有就是尽量能低功耗的
亲；这种东西都需要尖头的烙铁焊接或用热吹风焊接。现在的东西会越来越小，建议尝试改良烙铁头试试。
