Hi
I'm referring SLVA773.
http://www.tij.co.jp/jp/lit/an/slva773/slva773.pdf
In chapter 1, it is described that the output capacitor location is the most important for boost converter
and it will cause voltage spike and ringing that can damage IC.
My customer's layout placed the loop from output pin to output capacitor seems to be little longer.
Actually, there is possibility that the customer's board had damaged after power on/off.(SW shorted to GND inside the device)
However, the device short does occur in not all the customer's board. (it happened by 5 / 100 = 5% )
And waveform of SW node seems to be good for me.
(Vin = 3.3V, Vout=5V)
/cfs-file/__key/communityserver-discussions-components-files/196/6378.e2e.xlsx
To specify the root cause, I want to confirm the cause of device damage will be brought by layout issue.
1. Could it be possible to lead fatal damage at switching node of boost converter if output loop of boost converter is too long?
2. If output loop will cause fatal spike for SW note of the device, could it be possible to reproduce it?
(e.g. cut the output trace and lengthening it by adding lead)
BestRegards
