I am designing a PCB with a STM32 microcontroller, a GPS, DataLogger and X-Bee module. The power supply is a 12V Battery.
So in my project I need 5V and 3.3V, at the same time.
I don't know if it is a bad ideia to have a 5v linear regulator(input 12V) and using the 5v as input in a 3.3v LDO regulator.
I am aware of the Low Dropout properties of the LDO and the
power dissipation of the voltage regulator.
I came to this idea because the circuit used to shut down due to the temperature. I don't want to use a buck converter because I don't want to put an inductor in the same PCB with the X-bee(Radio Module).
Finally, my project is included in a car, so temperature is a thing(the engine or even sun)
Electrical – Use 5v Linear Regulator and LDO 3.3V
3.3vldolinearradiotemperature
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Best Answer
Use a non-linear power supply (i.e. a buck converter (like LM2596) in your case) for conversion from 12V to 5V. Then use a linear regulator (like AMS1117) to convert from 5V to 3.3V.