I'm looking for a proper power supply schematic which would fit my needs and would have all required protections (overcurrent, overvoltage, reverse current, etc) for use in car. I want to power Atmega 328p (3.3v@8MHz), PCM5102 and CSR64215 module with it. They all should be powered from 3.3V. Any suggestions?
So I've decided to use DC-DC switching regulator for the first stage and multiple LDO's at the end which will bring the voltage down to 3.3V and power rest of the circuit. For the first stage I chose BD9778F switching regulator with built-in power MOSFET which features wide input voltage range (7V-35V). For the end part I'll probably use AMS1117 LDO's. I already draw the schematic for the first power stage and would like to get some feedback from you if possible. Thank you!
Best Answer
I would use the standard lM2576-5V switching regulator circuit and a lM1117-3.3 to bring that 5V down to 3.3v. I've had good luck with using this approach in cars in the past. You can use the schematics they have given in the schematics
http://www.ti.com/lit/ds/symlink/lm2576.pdf https://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/s2004/zz25/lm1117.pdf