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Low quiescent current 3.7V to 170V boost converter
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RawCode:
Hello there.
I would like to make a circuit to power a Nixie tube out of a small lipo battery.
Looking around for some schematics I couldn't find anything with a small footprint that doesn't involve a bulky ccfl transformer.

I found out that there are some people that are using a MAX771 for this purpose, but since I can't simulate any circuit in Ltspice with this particular IC (due to the lack of a model of it), I can't verify of this IC is suitable for this purpose.

Do you have any suggestion?

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David Hess:
Any single inductor or flyback transformer boost converter is suitable however an external transistor switch may be necessary.

What is your current requirement?
RawCode:
What do you suggest? Which kind of design?
There are 4 nixie tubes, but i think that i'll multiplex them, so i would need something between 1-2mA
SiliconWizard:
You can find an equivalent of the MAX771 (which is a boost controller requiring an external transistor) with Linear parts (if you're going to want to simulate this with LTSpice).
Look up "External Power Switch Boost".
Something like the LT1619 should be usable?

Beware that the transistor, coil, diode and capacitors at the output will all have to be able to handle the high voltage.
David Hess:

--- Quote from: RawCode on July 27, 2019, 06:22:25 pm ---What do you suggest? Which kind of design?
There are 4 nixie tubes, but i think that i'll multiplex them, so i would need something between 1-2mA
--- End quote ---

Figure 17 on page 7 of Linear Technology application note 118 shows an example of the boost converter which would be suitable.

An alternative which does not require the external high voltage transistor is to place a charge pump voltage multiplier on the output as shown here:

https://www.analog.com/en/analog-dialogue/articles/high-voltage-boost-and-inverting-converters-for-communications.html

Both could be combined if you wanted a really high output voltage.
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