Other Parts Discussed in Thread: TPS3619
Hello,
In our design the TPS3619 would easily get fried/broken if a malfunction in firmware occurs where the load (microcontroller) would draw around 100+mA continous between ( VBAT - VOUT ), in that case the TPS3619 would always get fried/broken and as an indication for us it starts to overdraw current ~ 120mA up to 400mA and overheat on it's own and when circuit is off the resistances across pins are near short. We thought as a solution that in case that malfunction in firmware would happen we would have a p-channel mosfet be wired in parallel between ( VBAT - VOUT ) where it would be activated by the PFO so as to carry any execessive current , basicly this circuit as a safety mechanism kinda works but unfortunately our microcontroller would have trouble in starting up or shuttingdown/going to sleep mode from VBAT in terms of time ; it takes an additional 4-5 seconds more to startup or shutdown.
Kindly note that the pulldown resistor at the gate of mosfet is not used as we are aware that the PFO is push-pull.
I would really appreciate it if someone would help us find a solution.
BR
OS