The TPS7A7100 uses an undervoltage lockout circuit to keep the output shut off until the internal circuitry is operating properly. The UVLO circuit has a deglitch feature that typically ignores undershoot of the input voltage upon the event of device start-up. Still, a poor input line impedance can cause a severe input voltage drop when the device powers on. As explained in the Input Capacitor Requirements section, the input line impedance must be well-designed.