Hello,
I've a battery based device that uses a buck/boost to efficiently use entire battery voltage range (4.2-3.0) . This component have a low quiescent current between 25-45uA and regulate output to 3v3 (there's devices than doesn't work in lower voltage modes).
When device is off, there is no sense to keep this regulator active even low Iq . Since nRF have a good sleep mode with very low sleep current would be a better choice to use his internal LDO+DC/DC to keep device powered .
Problem arise when battery gets close to 3v3 . Internal LDO is no longer suitable and from datasheet only VDDH or VDD must be connect at time.
I can use diodes to keep both power on VDDH , but when voltage is lower to somewhere like 3.4v I should disconnect internal LDO due dropoff. Don't know if it's suitable.
Can you advice me an approach that I can use to overcome this problem if there's a solution?
Actually is an evaluation about possibility to increase device efficiency.