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To trigger a device input I need a voltage of at least 18 V. One can surely solve this with an external voltage source and a transistor but is there also a way to boost the GPIO that high without an additional voltage source? I'd prefer a readymade solution (boost converter, villard/greinacher on extension board). I just need a voltage slope to shoot the trigger - no power required (I <1 mA).

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"No current required" calls in my opinion for a charge pump. This is the concept typically used for RS-232 drivers/transceivers. Actually if 15 V are sufficient (and not 18 V) as written, something like the MAX232 might be the thing to go with.

Charge pump with a toggled GPIO however should also be possible. I'd look into this.

  • Unfortunately 15 V are not enough. Are there no readymade solutions available for this? – blade_runner Oct 6 '15 at 13:17
  • I checked a few integrated charge pumps but found none that provides a quadrupled output voltage. Doing this the hard way (discrete components) seems quite lavish to me. So maybe a simple low current boost converter is still easier. After all they come quite cheap and with small footprint, e.g. TPS61040/41 – Ghanima Oct 12 '15 at 7:36

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