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Add precise output adjustment to low-voltage supplies

Posted: 18 Apr 2011     Print Version  Bookmark and Share

Keywords:feedback voltage  trim potentiometer 

The increasingly stringent supply-voltage specifications for FPGAs and microcontrollers have emphasized the need to tweak output levels and provide voltage margins as specified. That adjustment can be performed with a mechanical trim potentiometer during PCB assembly, or you can implement an inexpensive circuit that enables adjustment both at assembly and subsequently as required, over the life of the product.

To tweak supply-voltage levels and adjust voltage margins as required, the circuit described in this application note introduces an op amp (MAX5481) and digital potentiometer (MAX4245) to control the feedback voltage to the voltage regulator.

View the PDF document for more information.

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