Im using a STM32L152RDT6 in my design and a regulator TPS78326 which does the power supply to the STM. If waking up from STANDBY, the load transient response causes a drop of Vin. In this case 2.6V to 2.4V. The STM is supposed to work down to 1.8V, so i expect it to work but it seem to be unreliable. 10 out of 100 devices hang if they boot from standby even before reaching the main function. On working devices the drop is a little less deep, like 2.6V to 2.45V. If i replace the regulator by an external power source (which is stable), i also dont have any problems. So it seems to me that the STM32L152 can't handle a steep drop of 0.2V while waking up from standby. The errata sheet don't mention any problem here, but maybe im not alone with this problem?
Kind Regards,
Christian
