Hi, support team
We have an automotive product that uses this chip for 12V to 4V. 1pcs failed after traveling 2000KM, and we found that the chip did not have normal output voltage.
The reason is that the originally designed 12V voltage input to chip PIN3 EN is only 0.8V, which is lower than the threshold voltage of 0.9V. As a result, the chip cannot output voltage normally.
The voltage at both ends of the R47 resistor at the test front end is 11.2V.
After X-ray to eliminate the welding problem, we think it is chip abnormal. The root cause is that the leakage current input to chip PIN3 is large, which exceeds the specification 1uA.
So we removed the chip and sent it to your team for analysis.
But the leakage current was not tested in the failure analysis report：[QEM-CCR-2211-00731], and the bench was different from our design, so abnormal phenomenon could not be reflected.
So we tried to record this phenomenon again after the samples were sent back. However, the phenomenon of excessive leakage current after rewelding can not be repeated.
We and the automobile company pay much attention to this failure part, but we cannot explain this phenomenon at present.
We hope to get your help, thank you
Best regards,
FeiYang
