TPS62873: TPS62873Y1QWRXSRQ1 output problem

Hi Rocky,

Thanks for reaching out to us.

Please see some suggestions below to determine if it is a device issue.

1. Did the customer tried to swap the bad IC, and place it the good board? If not, can you ask them to do so?

2. Ask a photo of the top marking of the bad ICs. It should be "873Y1B"

Best regards,

Excel

yes, the silkscreen is 873Y1B, it has problem in this batch?

Hi Rocky,

Thanks for sharing the photo of the body marking. Yes, the body marking is correct.

When you placed the bad IC to a good board, is the output voltage still 0.85V?

I will check with our team if there is a batch issue on this device. In parallel, I suggest to contact local TI Sales team and send a "NG" sample for failure analysis.

Best regards,

Excel

Hi, Regidor:

we did your suggestion, and the bad board IC in the other board, output is ok, 0.8V.

it is soldering problem? which one does not soldering well, will impact the output?

6.2K resistor?

Hi Rocky,

Thanks for the providing the evaluation result.

Most likely the issue was caused by the IC soldering (poor contacts between the IC pins and PCB pads), and not soldering of the 6.2k resistor which is connected to VSEL pin because this version of the device doesn't support 0.85V output. 

Anyway, I will reach out to you ask via email so you could share the schematic and layout so I can review it.

Best regards,

Excel