[FAQ] LM2611: how to generate -2.5V

Part Number: LM2611

I want to know how to generate -2.5V with this part. I read the datasheet and I don't see any reference in how to configure the part.
8.2.3.1 Design Requirements
This design converts 9 V (VIN) to –5 V (VOUT). Adjust RFB2 to set a different output voltage.
if there is a formula to show me how to do the conversion then I'll be set

  • Hello Omid,

    Chapter 8.2.1.2 in the datasheet gives a bit more information on the calculation of the feedback resistors. NFB is regulated to -1.23V, so you can calculate the output voltage like this: VOUT/VFB = (RFB1+RFB2)/RFB2

    Best regards,
    Brigitte