The undervoltage lockout set point is configured using the resistor divider, R_{EN_TOP} and R_{EN_BOT} connected to the EN pin. Set the R_{EN_TOP} = 100 kΩ and, using Equation 1, calculate the value for R_{EN_BOT}. For an UVLO = 3.5 V, R_{EN_BOT} = 15.5 kΩ. When choosing the UVLO set point, the resistor divider must ensure that the device will still get enabled for the VIN used in the application. This is achieved by making sure that the V_IHEN requirement is still met with the chosen resistor divider and that the VIN needed to meet the requirement is smaller than the VIN used in the application. Equation 13 shows this VIN and V_IHEN requirement to set the UVLO point. For this particular application, the requirement is met as the result is 4.84 V.

Equation 13.