The BIAS pin UVLO (UVLO(BIAS)) circuit makes sure that the device remains disabled before the input supply reaches the minimum operational voltage range, and that the device shuts down when the input supply falls too low.

The UVLO(BIAS) circuit has a minimum response time of several microseconds to fully assert. During this time, a downward line transient below approximately 2.8 V (with the charge pump enabled) or V_REF + 2.1 V (with the charge pump disabled) causes the input supply UVLO(BIAS) to assert for a short time. However, the UVLO(BIAS) circuit does not have enough stored energy to fully discharge the internal circuits inside of the device and may result in incomplete discharge of the OUT and NR/SS capacitors.