The internal LDO has a lower EN threshold than the regulator. When the EN pin voltage is above below 1.1 V (maximum) and below the precision enable threshold for the output voltage, the internal LDO regulates the VCC voltage at 3.29 V typically. The precision enable circuitry is ON once VCC is above the UVLO. The internal MOSFETs remain in tri-state unless the voltage on EN pin goes above the precision enable threshold. The LM76002/LM76003 also employs UVLO protection. If VCC voltage is below the UVLO level, the output of the regulator is turned off.