Has anybody used the LT4256 hot swap controller as an electronic circuit breaker? I have simulated and designed a board that is essentially identical to the evaluation module (resistor scales are different due to different source voltage). I am trying to enable (turn on or off) the LT4256 by pulling UVLO pin low using an external MOSFET circuit, similar to Fig 11 of the datasheet (see link below).
I have a 36V source (battery) connected to the input, and a 32 Ohm power resistor load. When closed, the resistor draws a little over 1A. An MCU toggles the external MOSFET gate low to attempt to open the larger series NMOS.
When I attempt to connect the MCU GPIO to the MOSFET gate, the LT4256 IC heats up to over 100C (verified using a thermal imaging camera). When I disconnect the MCU control signal, the LT4256 cools down and seems to operate properly.
Any thoughts or suggestions? I will test again soon, but with a manual short across UVLO. I realized may not be controlling the FET with a high enough gate voltage. Thank you!