I have a RAK4631 on a 19007 board. With a fully charged LiPo connected to the BAT connector I put the module in deep sleep. There is 70uA of current draw. This seems reasonable for the setup I’m using. I have an external i2c sensor and that is part of it.
If I lower the voltage and watch power consumption, at 3.56V or less, the currrent draw jumps up to 600uA and stays there. This makes my low battery die even faster. Any idea what is happening?
Thanks!
Welcome to the forum @maadrad1
Yes, it is expected behavior of the 3.3V voltage regulator which has a 3.6V minimum, supply voltage to work properly.
I see thank you. Another question, I guess could look at the schematic - or just ask you 
Is it a regular linear regulator? or a step down converter of some kind?
It is the SGM6036 450nA Ultra-Low Power, Buck Converter with 600mA Output Current
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