Abstract: The purpose of this application note is to show an example of how a digital potentiometer can be used in the feedback loop of a step-up DC-DC converter to provide calibration and/or adjustment of the output voltage. The example circuit uses a MAX5025 step-up DC-DC converter (capable of generating up to 36V, 120mW max) in conjunction with a DS1845, 256 position, nonvolatile (NV) digital potentiometer. For this example, the desired output voltage is 32V, which is generated from an input supply of 5V. The output voltage can be adjusted in 35mV increments (near 32V) and span a range wide enough to account for resistance, potentiometer and DC-DC converter tolerances (27.6V to 36.7V). The application note you have requested is available in Acrobat PDF format: APPLICATION NOTE 226: Step-Up DC-DC Converter Calibration and Adjustment Using a Digital Potentiometer (PDF, 305kB) A free Acrobat PDF reader is available from: http://www.adobe.com/products/acrobat/readstep.html Related Parts   APP 226: Dec 10, 2002 DS1845 Dual NV Potentiometer and Memory Full Data Sheet (PDF, 204kB) Free Samples MAX5025 500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters Full Data Sheet (PDF, 264kB) Free Samples Automatic Updates Would you like to be automatically notified when new application notes are published in your areas of interest? Sign up for EE-Mail™. We Want Your Feedback!   Download, PDF Format (305kB)  AN226, AN 226, APP226, Appnote226, Appnote 226