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要设计一款 输入电压3.0V~4.2V，输出电压5.2V 输出电流可达2.5A，效率80%以上的后备电源，请问选哪颗IC 比较好~
推荐TI的TPS63020, 电路图见附件,效率可以达到满载85%以上。
