Power Management board NMOS Gate and Source short circuited

[Seerzy]

Hi Guys,
I am working on the robotics project, that is why I think the PM board gonna be useful for me to monitor the power. Thus, I print the power management board with some small changes. I powered the power management board, however, when I power the board, I found out that the source and gate has been short circuited before I enable the LTC7001.

The figure is the schematics, I did not change much only change the MOSFET to BSC028N06 which has the very similar characteristic.
Can someone help me with this issue?

[Seerzy]

The voltage supply to similar to the Open Dynamics' design which is 12V

[Seerzy]

Hi Guys, the problem has been fixed but the voltage is clamped at 5V if I am not enable the LTC700 at the output.

[thomasfla]

Hi, I also observed this on our boards,
This happen when no load is plugged on the output. I suspect some capacitive coupling that gets rectified.
In practice this will drop to zero as soon as a load is present.