BQ40Z60EVM-578: CSD17308Q3's Datasheet says Vgs (Max) is +10/-8V and the output voltage of ACFET and HIDRV pins of EVM is more than 15V.

I'm not sure how the Vgs of the FETs are related the to the output voltage. The Vgs voltage is driven by REGN, which has a max voltage spec of 6.3V. See datasheet page 16 section 7.39. Have you looked at the AC adapter you're using a or the layout of your PCB for the gate drive traces to parasitics isn't increasing reise and fall times leading to shoot through currents?

http://www.ti.com/lit/ds/symlink/bq40z60.pdf

"Gate voltage (HiDRV) is higher than maximum ratings of CSD17308Q3 (Q8) so, it might causing failure of Mosfet " We came to this point after analyzing following issues.

1. Initially we found charging is not happening in EVM. 

2. After debugging hardware we found out it was because of Q8 Mosfet stopped working.All the voltages from ic (HIDRV, LODRV, ACFET) are looking fine. We gone through datasheet of CSD17308Q3 there its mentioned Maximum gate voltage is +10V/-8V. 

3. After replacing Q8 Mosfet it started working again. 

4. After few days again this cycle repeated several times.

Here in our today's test we checked REGN output, it was 6.1V  at D3's Anode end. And we have looked at AC adapter everything looks normal. 

Note :  All this is happening with BQ40Z60-EVM which is brought from Ti Store. 

Regards,

Ravikumar G.

Hello Damian,

Thanks for the response. I have shared my address with the help of the private message feature. Kindly do the needful.

Regards,

Ravikumar

Hello Damian,

Thank you so much.

Regards,

Ravikumar G.

Hello Damian,

I would truly appreciate it if you can share us tracking details.

Thank you,

Regards,

Ravikumar G.

Hello Damian,

I have received EVM's. Thank you so much for helping our journey  to  fight climate change and improving energy access. I'll inform you once our product is out to public.

Regards,

Ravikumar G.