2020-04-15 07:17 AM
Hello,
I am currently working on my end of year project. I first realized my project under a development kit then now I realize the PCB.
I am currently facing a problem. I have an STM32L073RZ which I must supply. As a power supply, I have a Li-SOCl2 accumulator. The battery output voltage is 3.67V in open circuit and 3.6V at 1mA. The supply voltage of the microcontroller is 1.65V to 3.6V.
That's very fair, so I was thinking to use a 3.3V regulator. But the problem is that I have not found a regulator with low consumption. The lowest consumption I found is 40uA, it is very small but it halves the autonomy of my project !
So I wondered if it was possible not to use a regulator and directly power it with the accumulator. Knowing that the accumulator has a nominal voltage of 3.6V and at the end of discharge of 2V.
Thanks,
Steven
2022-05-04 05:44 PM
I would have the same question
2022-05-04 07:52 PM
MCP1702 - 2 uA
AP7381 - 2.5 uA
Bad idea to not use LDO voltage regulator,
2022-05-04 11:25 PM
... and many more, check the TI LDOs, they have some with Iq < 1µA.
NEVER connect the battery directly!
2022-05-05 12:52 AM
The STLQ020 might be an interesting alternative: 2-5.5V, 200mA, typ Iq=0.3µA
Regards
/Peter
2022-05-05 02:09 AM
:) Looks good, but no samples or at distri. available in SOT23-5, adj. or 3.3V :(
Just starting a new project where I could use these, too.
2022-05-05 03:31 AM
could you tell me why it is a bad idea? sorry really new here