We use LT8620 Byck converter one of our design. Input : 24VDC, Output:3.3V @1A
When I powered from 12V adaptor to Chip Power input, Chip doesn't poroduce 3.3V. Just only working INTvcc regulator. (I can measure 3V3 from INTVCC)
I disasssambled chip and assamble new LT8620 and working correctly. Two of this chip LOT Number is Different!!
Fault Chip LOT Number : 8L24 (Production Date January 2018) - Top Marking of the chip
Working Chip LOT Number : 9A04 (Production Date January 2019) - Top Marking of the chip
What is the problem for this LOT Number producton? Can you examine this LOT number production and give us any suggestion, please?
Hardware Design Engineer