Other Parts Discussed in Thread: CSD17551Q3A
Here we are seeing MOSFET failure which is driven by HIDRV1 in our board with BQ25713. As per datasheet HIDRV and LODRV pins are driven by REGN So, we are expecting output of the HIDRV and LODRV pin should be below or around 6.5V. But in our case we are observing around 20V with spikes up to~24V in the EVM. We have chosen very similar MOSFETs (RQ3E100BNTB) instead of using CSD17551Q3A (one which used incEVM-017).
Here are some pictures of HIDRV1 & HIDRV2 captured in the EVM:
When absolute maximum Vgs(Max) mentioned in datasheet of N-MOS is +/-20V, signal coming from BQ25713 can damage if it is more than absolute maximum. But we did not understand how MOSFET used in EVM is handling this voltage.
If you have solution or better explanation please write back to us.