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TPS746-Q1 dropout voltage

Hi all,

请教下想用3.3V/0.5A输出时,需要的最小输入电压是多少,规格书中Figure 4表明dropout voltage大约80mV,但6.7章节中建议Vin=Vout(nom)+0.5 or 1.5V,Iout=1mA  请问以哪个为准?