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?
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.