Hello,

I'm working on a solar powered nixie watch (similar to the Kopriso Nixie 
watch).

It's crucial that I dramatically reduce stand-by power as much as possible 
and within 2.5uA, which is where the solar panels will balance off the 
stand-by current.

Regardless of which power supply I use, even using the shutdown pin, the 
power supply still takes 2.5uA. This is perfectly in line with the 
electrical specifications of the datasheets.

So, my question is, can I 'brute force' a shutdown, effectively removing 
the power from the VIN pin via a PNP high speed mosfet such as MMBTA42 or 
it will introduce too much of a delay in starting the power supply?

I'm going to try it on the fly but if anyone has any suggestions on how to 
bring to 0 or to 0.01uA the stand-by current that would be great. 

As an example, I'm using the LT1308B DC/DC converter as on page 17 of the 
datasheet 
https://www.analog.com/media/en/technical-documentation/data-sheets/1308abfb.pdf

Any suggestions will be much appreciated.

Thank you,
Max

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