MCU设计时,总电源输入只有12V,MCU供电为3.3V,能不能直接使用LM1117来把12V降压到3.3V给MCU供电呢?
如上图所示,输入12V时貌似超过了线性输出的3.3V,去到5V范围了?如何解决?
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Hi
你可以这么做,但是不是很建议,LM1117是一颗800mA的LDO,LDO不适合于压差太大的应用场合,否则转换效率低,12V转3.3V,可以考虑下降压DCDC,比如TPS562209