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帮忙推荐个PMU电源芯片，（需要用到锁存功能，纯粹的DCDC不行）
要求，
1，输入电压13.5V，输出电压3.3V
2，输出电流50-100mA,(只给MCU供电要求不高)
3，暗电流要求小于6mA(需要尽量小的静态电流和尽量大的效率)
