im using TPS2557 in one my application.
the device was working fine in the begining, we did some rework @ regulator side since the out put was not constant and is dipping @ regular interval.
same regulator output is give as input to tps2557 switch. Now im seeing fault asserted ! FAULT# = 0'. suprisingly still im getting output voltage.
and when i measured the impedance of the FAULT pin to the PULL UP supply, it is showing 3.332K, even there is a pull up to this pin with 100K.
i removed 100K then verified the impedance b/w FAULT pin to PULL up supply but still im getting 3.3K only.
Can you explain me why it is seeing such low impedance ?