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19859 Posts in 1275 Topics by 5187 Members - Latest Member: charbuild October 04, 2022, 07:32:51 PM
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Breaktru Forum  |  eCigarette Forum  |  General Discussions  |  Topic: dropping voltage
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Author Topic: dropping voltage  (Read 4250 times)

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Offline dc99

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dropping voltage
« on: April 13, 2015, 10:03:31 PM »
Ok, one of you electrical people tell me the easy way to do this. I need to cut the voltage on a 18650 and keep it between 2 and 3.2. Will just be a few ma and has nothing to do with the mod function.

Offline CraigHB

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Re: dropping voltage
« Reply #1 on: April 14, 2015, 12:47:59 PM »
Sounds like a job for an LDO.  You can find them with drop-out under a hundred mV.  If output voltage has to run above battery voltage minus regulator drop-out, you'd have to use a small buck-boost regulator.  There are buck-boost charge pumps that are easy to wire and have a small footprint, just a chip and three caps, input, output, and switch.  For variable output voltage there would be a feedback divider to set voltage as well, just two resistors.  The Microchip MCP1252 would be an example.

Breaktru Forum  |  eCigarette Forum  |  General Discussions  |  Topic: dropping voltage
 

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