I have used LP3961 3.3V regulator cicuit for my STM32 microcontroller circuit. I have implemented low power stop mode in STM32. Micro controller consumed 25uA itself. When I Measured the current consumption of whole circuit with regulator, It was 3.5 mA. I don't understand why the regulator takes much current than microcontroller. Do anyone know the reason?

  • \$\begingroup\$ What other stuff do you have on the board? Is there a high leakage organic polymer cap? A clock oscillator? Can you post a schematic? \$\endgroup\$
    – bobflux
    May 26, 2022 at 8:43
  • \$\begingroup\$ What else is on the board? Lets see the full schematic. What are you measuring the 3.5mA with? Are you sure your ampmeter is sensitive enough? \$\endgroup\$
    – Puffafish
    May 26, 2022 at 8:48

1 Answer 1


The LP3961 has a typical quiescent current of 3 mA in normal operation. Look for another linear regulator or find a way to shutdown/enable the LP3961.

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