按照 TPS61221的数据手册，其输入电压范围为0.7V-5.5V,当输入电压大于3.3V时，其输出电压不再稳压为3.3V，当输入电压为5V时，其输出为4.7V，这是什么原因呢？是因为其为升压芯片，只能进行升压，而不能降压吗？
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