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I want to design a low power circuit with stm32l micro and LoRa Module as its radio to send a sensor data to a gateway. The circuit is powered with a non rechargeable battery.

My problem is about its power circuit. I know that in order to decrease power consumption I have to decrease the quiescent current.

I want to turn on the circuit by turning on an LDO STLQ020 once a minute, and MCU in sleep mode is powered with a backup battery.

I want to know if turning on and off the LDO is harmful for hardware? Schematic

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    \$\begingroup\$ I presume you mean keep it off most of the time, and turn it on once a minute? That doesn't hurt hardware, unless you design it pathologically. Suggest using CMOS for the timer for its very low idle power consumption, clocked slowly for low dynamic power consumption. \$\endgroup\$ – Neil_UK Dec 10 '17 at 12:23
  • \$\begingroup\$ @Neil_UK yes I want to turn it on once a minute, but the wake up duration may vary from 6 ms to 20 ms, I want the MCU to say to regulator that I am done, and turn it off. \$\endgroup\$ – N. Parsa Dec 13 '17 at 7:51
  • \$\begingroup\$ I agree with Neil, this should not be a problem for your hardware. I think Maxim makes some ultra low power watchdog parts, as in a few nA, but I've not used them. \$\endgroup\$ – AnalogKid Dec 16 '17 at 21:38

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