SLVUAH4A August 2015 – October 2021 TPS54334
1.3.2 Adjustable UVLO
The under voltage lock out (UVLO) can be adjusted externally using R1 and R2. The EVM is set for a start voltage of 4.1 V and a stop voltage of 3.23 V using R1 = 220 k? and R2 = 84.5 k?. Use Equation 2 and Equation 3 to calculate required resistor values for different start and stop voltages. Considering the VIN UVLO, the stop voltage is set to 3.9 V.
Equation 2. 
Equation 3. 
Ip = 1.15 μA, Ih = 3.3 μA, VENFALLING = 1.17 V and VENRISING = 1.21 V