I'm planning to use two 3.3V LDOs to supply power for two MCUs, one is STM32, one is ESP-12. Input power of these two LDOs come from one SMPS module 5V, 3W (HLK-PM01). The reason for two seperate LDOs: I'm using STM32's ADC and I think separate power supply with ESP will make ADC more accurate. Another reason is there is a distance between HLK-PM01 and ESP, trace length almost 25mm. STM and ESP communicate through UART and both using same I2C F-Ram Memory IC, STM reads ADC, calculates something and save to Memory IC. Then ESP reads data from Memory IC and post to server. All same ground. LDO is RT9013 Datasheet.
So is it possible and working? Or it is a overkill?
Thanks very much