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初学者，在做信号源实验，需要外接3.3v和1.8v电源，求推荐一款LDO芯片，要求3.3v功耗大于2.5w，1.8v功耗大于1.5w的。
输入12V，经过整流到12V DC,降压到3.3V或1.8V，压降很大，LDO不合适。
建议用两个Buck（tps562200）来做，如果之后要求电源纹波小噪声低，再在Buck之后加LDO.
