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如下图的设计,其他所有电路均不焊接情况下,排除短路,只要焊接上INA219,3V3就会达到104mA (不过不是LDO的极限),这看起来并不正常,但是我从电路上没看到不正常的地方,我是INA219,top mark是A219
切断外部供电后,飞线从稳压源供电指示的电流也是100mA左右,INA219的3.3V电源输入是有0.1uF,靠近VCC引脚的电容.
这个是有一个串联的MOS,等效大约20mΩ.此MOS不管是否导通,或者无焊接,结果一样.
