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I'm making a small board for a DC / DC converter. Can I tie -Vin and -Vout together and think of them as GND? Is there some noise advantage to keeping them separate?

Edit: the converter one of the Murata UWE series linked here, the UWE-12/6.

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    \$\begingroup\$ Generally speaking, yes \$\endgroup\$ – Passerby Aug 14 '16 at 20:42
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    \$\begingroup\$ In some industrial applications GND isolation is the sole purpose of the device. \$\endgroup\$ – Harvard Aug 14 '16 at 21:02
  • \$\begingroup\$ @Harvard ok that makes sense.. this is a lipo battery powering a small computer dev kit, so I'm thinking GND isolation will be unnecessary. thanks! \$\endgroup\$ – Matt Aug 15 '16 at 0:14
  • \$\begingroup\$ I feel like you are not really providing enough information. It is probably OK, but most IC's for consumer-grade devices don't even have separate -Vin and -Vout. So I am a bit curious what IC you are using. Maybe you should post a link to the datasheet and let someone take a closer look. \$\endgroup\$ – mkeith Aug 15 '16 at 1:01
  • \$\begingroup\$ @mkeith -- edited my question to add a link to the datasheet. \$\endgroup\$ – Matt Aug 15 '16 at 1:44
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Yes, this is fine to do if you don't need isolation between the input and output sides of the converter. For the situation you describe (small battery-powered device) there's likely no EMI advantage to keeping them separated.

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