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TLV61220开启电压与官方不符

Other Parts Discussed in Thread: TLV61220

TLV61220 按照数据手册上的典型电路搭建的,只不过把R1换成680K,R2 改为10K,想输出4V左右的电压,两个10uF电容用的是钽电容,经过实验发现,开启电压大概在1.1~1.2V之间,0.7V根本无法开启。而且,第一次做实验的时候不知怎的把芯片烧掉了,无输出(可能输入电流过大?用稳压源调的),后换个芯片,开启之后输出一直是5V。芯片上面的丝印,几个字母好像是VUAI,代表的是什么意思?