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TPS2546 对外充电问题

Other Parts Discussed in Thread: TPS2546

 新项目在设计中发现,TPS2546设置为最大电流1A,CT1 低电平,CT2高电平,CT3高电平,此时对IPAD充电,IC输入和输出的压降有0.25V,且FAULT引脚输出低电平;而IC最大电流设置为2A时,IC的输入和输出仅有0.12V左右压差,Fault引脚为高电平。按照IC内部阻抗70mΩ计算,电流设置为1A时,此压降不正确

 是否此IC在设置低电流时无法正确的对IPAD设备进行充电?