TPS25947: burnt phenomenon on GND path

Henry Wang3

Genius 3315 points

Part Number: TPS25947

Hi Sir,

My customer used the TPS259470L to do the power MUX application, they found has the burnt phenomenon on GND path.

I am not sure the IN/OUT pins have not added any vias, is it a root cause?

Could you please help to review the schematic and layout? if it needs to modify, please advise it. Thanks!

TPS259470L_layout:

0 Kunal Goel over 1 year ago

Hi Henry,

I will get back by monday EOD on this.

Regards

Kunal Goel

0 Kunal Goel over 1 year ago in reply to Kunal Goel

Hi Henry,

I would recommend to use TVS at input and schottky at output for transient protection. Its device abs max violation which can cause burn fails.

Refer 10.1 Transient Protection in datasheet.

Regards

Kunal Goel

0 Henry Wang3 over 1 year ago in reply to Kunal Goel

Genius 3315 points

Hi Sir,

Thank you for your comment.

If IN/OUT pins have not added any vias, is it OK?

0 Kunal Goel over 1 year ago in reply to Henry Wang3

Not using vias can cause poor thermal performance and at high current device junction temp can be high but should not cause sudden fail .

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