SNAS879 December 2024 LMR60420
PRODMIX
The LMR60420 device can be configured to operate in either fixed or adjustable output voltage modes. For fixed output voltages as specified by the device orderable part number, simply connect the output voltage rail directly to the FB pin. When other output voltages are required, a resistor divider between the output voltage rail and ground with the FB pin as the center point set the output. Output voltage given a specific feedback divider can be calculated using Equation 16.
Alternatively, if the output voltage and RFBT are already known the value of RFBB can be calculated with Equation 17.
Note that typically 100kΩ is used for RFBT.