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Pin 1 (NC) of the DBV package is used as "Test pin, connect from 0V to 18V". We need to use this part in one of our designs as an alternative where we left this pin floating. I've tested multiple boards at room temperature using REF3450SQDBVRQ1 and leaving pin #1 disconnected; the 5V output looks very good. We could solder a bridge from GND (pin #2) to pin #1 into each board to satisfy the "connect from 0-18V" requirement, but that would add board assembly cost. Can you please tell me what performance parameters might be impacted if we leave pin #1 floating? Do we risk temperature dependence, or complete device failure, or is this simply a matter of trading off a small percentage of output voltage accuracy?
Much thanks! Falk
Hi Falk,
As mentioned in the previous e2e thread, it is encouraged to connect Pin 1 to GND or to 12V (max). We did not test the REF34-Q1 with the pin floating so we do not have data if the pin is left floating.
Ben
Thanks Ben. I understand that you don't have test data or would not be able to guarantee spec performance without the NC pin at a fixed voltage level, but I was hoping that your IC designer might be able to comment what risks there might be (e.g. latch up, noise) if that input is left floating. Is the pin used as a digital or analog input? As of the spec, I could tie to pin to any voltage between 0V to VCC, right? Best regards, Falk
Hi Falk,
After speaking to the previous apps eng who was responsible for the references, floating the pin should be okay and will not alter the performance of the reference. I hope this answers your question.
Ben