I'm currently designing a circuit for a long term device that will consume 1-2mA at 3.3V constantly. The system is run with a default lithium polymer battery and I need to get as much time out of it as possible.
In the current state, I'm searching for the most efficient voltage regulator possible. The best one I could find was the TPS63805. It is a switching voltage regulator which means that it takes more space and costs more, which is luckily not a big problem for my project.
It seems to be that these kind of regulators are a bit more efficient on higher current consumptions. When only using 1mA, it is at about 90% efficiency, which is good but can it get better with another component or technique? (I'm already making sure to minimize the power loss through PCB design.)
Thanks for any help in advance!
PS: Sorry for any grammar or spelling mistakes, I'm not a native English speaker.