[coder543]

If money is no object, there are some interesting chips out there. The LTC3335 chip[0] is a buck-boost that claims to have a 680nA Iq. Not as low as the TPS7A02, but it looks like it could make up for that in efficiency if your design does anything other than sleep.

[0]: https://www.analog.com/media/en/technical-documentation/data...

[ilyt]

I was looking for one for one of my project but this is above "I could have just 10 years worth of batteries instead of that" level of pricing