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LT6654BX DNC Pins

Thread Summary

The user is designing with the LT6654BX and seeks advice on handling the DNC pins to minimize leakage. The final answer recommends keeping the DNC pins away from other traces, including power or GND planes, to reduce leakage, especially at high temperatures. Solder mask conductivity and creepage/clearance are also important considerations.
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Category: Hardware
Product Number: LT6654BX

I'm considering using the LT6654BX in a new design. The datasheet states that the two DNC pins should have minimum leakage to ground or Vin. It suggests placing a metal ring around the pins and connecting these rings to Vout. The IC package is too small to allow for a trace ring around the pins. I was searching for a reference PCB layout on how this is to be done. Any thoughts or recommendations will be appreciated. 

  • The DNC pins are in-package trim pins. Leakage on these pins would be to circuit nodes that affect Vout. The concern here is that at high temperature the PCB leakage could be significant. Any PCB design techniques that minimize leakage to the DNC pins is appropriate. So keeping them away from other traces, including power or GND planes is good, and would probably be enough in lieu of a guard. Solder mask conductivity and creepage/clearance should also be considered.