Power Supply design for MCU input from Car Battery

[kqamar]

Dear All,

Need help to design a stable 5V and 3.3V DC voltage output from 12v DC car battery input. Can i used a voltage regulator? if i'm planning to put the circuit in the boot of the car? Does the regulator is the best option considering the temp inside car boot?

I've read thru some article regarding buck converter but not really understand the design as I have not design any circuit since last 4 years. That makes my brain drain out:razz:

Please someone help!

---------- Post added at 07:42 ---------- Previous post was at 07:34 ----------

BTW, the current output is 1A..thanks for your support

 

[srizbf]

you can use a voltage regulator(linear/switched).
see that the input dc applied to regulator from battery contains an lc filter.

in a car , interference must be taken care as the first requirement.

 

[zoro1]

Use LM2575T-5 -low drop 5v TO220 ,and for 3.3V LM2651MT -TSSOP16 ,LInear like 7805 is not so good.