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运算放大器供电电压低低温出现问题

Other Parts Discussed in Thread: LMH6629

目前使用LMH6629,供电电压为5V,上电时IN+端比IN-端高出约100mv,由于运放供电为超级电容,超级电容在开机时电容上升有个缓慢的充电过程,在做低温约(-20度)时,当超级电容电压上升约到2V时,运放输出会有一个先变低然后又变成电源电压附近,由于运放输出控制PMOS开关器件,PMOS的S接超级电容,运放输出接PMOS的G,这样就会导致PMOS导通,这个问题我做了2个星期试验始终解决不了,望赐教!