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We have used EN6360QI regulator in one of our designs and found a voltage drop at the output during the high-temperature test (at 60 degrees Celsius.) The voltage gradually decreases to 0.3V from 1V as shown below.

enter image description here

We have tried without connecting any load to it but the behavior is the same as shown in the above image. Could someone please tell us what causes this?

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  • \$\begingroup\$ One piece doing this? Maybe a faulty component (shorted capacitor, for example) or a faulty solder joint. Intermittent faults are frequently temperature-sensitive. \$\endgroup\$ Commented Mar 17, 2023 at 13:02
  • \$\begingroup\$ @SpehroPefhany we have observed this issue in multiple boards. The issue is unique in all the boards. \$\endgroup\$ Commented Mar 17, 2023 at 13:16
  • \$\begingroup\$ @Chitharanjan You mentioned testing this without a load. I've not looked, but is there a minimum load for this converter? Or does it work both CCM and DCM? Is the source of the IC reliable? \$\endgroup\$ Commented Mar 17, 2023 at 19:47
  • \$\begingroup\$ gradually decreases within less than 1 ms. \$\endgroup\$
    – greybeard
    Commented Mar 18, 2023 at 3:29
  • \$\begingroup\$ @periblepsis we observed the source of the IC is constant 5V, there is no fluctuation on it. I have also not seen the CCM and DCM mode in EN6360QI datasheet. \$\endgroup\$ Commented Mar 20, 2023 at 5:49

1 Answer 1

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The EN6360QI regulator itself is rated for 85 °C, so that should not be an issue if these are genuine EN6360QI parts.

Some things to consider:

  • Is the supply voltage within spec's (2.5 - 6 VDC)?
  • Are associated capacitors within tolerance at 60 °C for value and leakage?
  • Have you tried substituting the EN6360QI with one from another supplier?
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  • \$\begingroup\$ 1) Yes it's within spec i.e 5V 2) The components associated with ii used in the design are rated to operate at -55c to 125c basically automotive grade 3) Currently, this part is obsolete and we ordered from digikey when this part was enough stock \$\endgroup\$ Commented Mar 21, 2023 at 4:16

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