To avoid misoperation of the device at low input voltages, an undervoltage lockout (UVLO) comparator monitors the supply voltage. The UVLO comparator shuts down the device at an input voltage of 1.7 V (max) with falling VIN. The device starts at an input voltage of 1.8 V (max) rising VIN. After the device re-enters operation out of an undervoltage lockout condition, it behaves like being enabled.