7~25V输入，5V 1A输出。
紧急情况输入可能最低到5V，这种情况下希望还能输出，而且压降尽量少，即输出尽量高，至少应该在4.2V+
由于手执设备，电路面积要求很严，希望外围器件和DCDC能尽量少和小
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