I have a trouble with the DC2039A demo board.
Really I made my PCB cancelling the USB support and the on board MCU and literally copying the gerbers coming with the Demo Kit.
The load is made of a 24V 72AH SLA battery + a 5Ohm/200W resistor.
The battery is almost fully charged (by an external battery charger - I am mean not charged in advance by the demo board).
I burned one board, the LTC4015 fired.
I left the chemistry switches opened and I set the CL0 1 2 to H.
Everything is OK when I power the unit by an external power supply; the battery is sinking a little (100-200mA) and the resistor is absorbing the right current (close 5A).
When I powered off the external Power Supply to try the auto-switch to the battery, not immediately, but within a couple of minutes the LT4115 literally fire close the pins IntVCC and DrVCC (top right corner).
Before the fire the current sink by the resistor was correct, almost the same when powered from the external power supply.
I am far away from the limits of the demo board (max 10A SYS current + max 8A BAT charge current, I am 5A and 200mA respectively) .
I read that it is better to power the DrVCC by an external dedicated LDO but, because I am far away from the absolute maximum ratings, I scare about a mistake somewhere else.
The MOSFETs were always cool, no any hot part but the LTC4015.
Any suggestion? Where is my mistake?