SNVSA46B June 2014 – January 2018 LM46001
The output voltage of the LM46001 device is externally adjustable using a resistor divider network. The divider network is comprised of top feedback resistor RFBT and bottom feedback resistor RFBB. The following equation is used to determine the output voltage of the converter:
Choose the value of the RFBT to be 1 MΩ to minimize quiescent current to improve light load efficiency in this application. With the desired output voltage set to be 3.3 V and the VFB = 1.016 V, the RFBB value can then be calculated using Equation 11. The formula yields a value of 444.83 kΩ. Choose the closest available value of 442 kΩ for the RFBB. See Adjustable Output Voltage for more details.