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LMZ21700 Scaling RFBT & RFBB for 5.5 V output

Other Parts Discussed in Thread: LMZ21700

I am designing an circuit to use the LMZ21700 for an output of 5.5 V with max 0.5 A of current.  Input Voltage is 14 - 17 V DC. Pg 22 of the datasheet indicates for a 5 V output V RFBT = 232K and RFBB = 44.2K. If I require a bit more output V, can I increase RFBT up to approx. 249K and get approx. 5.5 V output?

Thanks for any assistance. I have a Demo-board presently being shipped to perform some bench testing prior to PCB layout. -GRC

  • The maximum VOUT that the LMZ21700 can regulate well is 6V. Therefore, you should be able to use the device for an output voltage of 5.5V. Follow the datasheet to calculate the right values of the feedback resistors for the required output voltage.