The undervoltage lockout (UVLO) is adjusted using the external voltage divider network of RENT and RENB. RENT is connected between the PVIN pin and the EN pin of the LM76002/LM76003. RENB is connected between the EN pin and the GND pin. The UVLO has two thresholds, one for power up when the input voltage is rising and one for power down or brownouts when the input voltage is falling. Equation 28 can be used to determine the VIN UVLO level.
The EN rising threshold (VENH) for LM76002/LM76003 is set to be 1.218 V (typical). Choose the value of RENB to be 100 kΩ to minimize input current from the supply. If the desired VIN UVLO level is at 5 V, then the value of RENT can be calculated using Equation 29: