Hi,

Thank you for your question.

Sometimes it is difficult to figure out how DRV is damaged. However, I can see some suspicious items from your information.

Question. What load is connected to OUT1 and OUT2? Motor or something else? Can you show the connection as well?

What is your application? Is it automotive 12V system? (VM=12V?)

1. Lack of bulk cap and L32 inductance.

I recommend to check this item first. Your schematic does not have bulk cap(~100-200uF) and has L32 Inductor. One possibility is VM voltage gets higher (e.g >40V) right after stopping motor. Charged energy on motor goes to VM through diode path of OUTPUT high side FET. Then energy is blocked by L32. Eventually VM could be hicked up a lot.

Trial suggestion. Remove L32 and put 0ohm resistor instead. Add ~200uF Bulk cap between VM to GND. Check VM voltage whether any hick up voltage is happening or not. 

2. Here is my schematic review feedback and proposal.

3. Is VDD 5V?  Need to be lower than abs max SPEC of IC.

4. Lack of thermal via.

I cannot see thermal via on your PCB. Without thermal via, thermal performance could be very bad then DRV could be damaged by thermal.

regards

Shinya Morita

Hi Shinya,

The load connected to OUT1 and OUT2 is 24V DC brush motor max power of 50W

The application is medical

The VDD is 3.3V

Thanks for your advice i will add the recommended  capacitors.

Thank a lot,