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TPS24701在3.5v工作时 短路保护不工作

Other Parts Discussed in Thread: TPS24701

使用热插拔控制/保护芯片TPS24701, 规格书上工作电压范围2.5V--18V,实际测试3.5V供电时 短路保护不起作用,即输出电压直接短路到GND时 Vgate脚输出不为0V(约2.8V),不能关断外置MOS管;只有过载时(25mV)保护有作用,比如设置1.5A(16.5mΩ sense电阻)过流保护,接2欧姆水泥电阻负载时,Vgate会输出0V 关断外置MOS管。这是什么原因?