i would like to use the LT4356-3 as short circuit protection. During a short circuit event it can happen that the input voltage drops to a very low value due to high line impedances between source and LT4356-3. The voltage drop last only for a few µs until the maximum short circuit current comes up. This leads to a shutdown of the LT4356-3 and to a floating Gate potential. At least it seem like an uncontrolled gate situation. In this case I have measured to defects of the LT4356-3:
- Charge pump is only able to deliver 5 V on the Gate independent of the input voltage
- The sens Pin is not able to detect any current threshold
What is the problem here? Are there any design rules i should be aware off take to guarantee a save operation during short circuit without damaging the LT4356?