Generating a solid 5V output from a buck converter whose output varies from 4.8V to 5.2V

Thread Starter


Joined Mar 21, 2020
Hi Team,

I have a buck converter whose output varies from 4.8V to 5.2V.This buck converter is a present in my VCU.Input for the buck can vary from 8V to 14V
It is powering many IC's present in the board and for those IC's this 4.8V to 5.2V is fine no issues.

The same output from this buck converter is provided as reference voltage for vehicle's throttle.

Since the output of buck converter is varying,the throttle output also varies,which is not acceptable.

My question is there any circuit which helps me to generate a constant 5V from this varying 4.8V to 5.2V buck output.
Inviting your thoughts/suggestions.



Joined Oct 7, 2019
A good buck will not do this.
When you say varies from 4.8 to 5.2V, is that from one part to another, or ripple from one moment to another, or ????
Post a schematic of the buck, please.

schmitt trigger

Joined Jul 12, 2010
Exactly what Ronsinpson mentioned. A good buck should not have that much regulation loss.
Is this one of those Ebay specials? Those that are like 3 for 5 dollars?
Last edited:


Joined Nov 6, 2012
What does this project consist of ?

Is this a Fuel-Injection-System that You are trying to create from scratch ?,
or some type of aftermarket Fuel-Injection-System ?

Did You create the Wiring-Harness yourself ?

Please provide a Schematic.