The RT9181 is a low dropout voltage regulator with anoutput 2% accuracy and supply a continuous 150mAcurrent within operating range from a +3V to +5.5V input.The power good function monitors the output voltageand indicates by pulling low the power good output (opendrain).The RT9181 requires a small output capacitor with lowESR for stabilizing output voltage. The device alsominimizes output overshoot during power up.The RT9181 uses an internal PMOS as the pass device,which consumes 160μA supply current independent ofload and dropout conditions. The EN pin controls theoutput and consumes no input bias current. Otherfeatures include current limiting, over temperatureprotection, and under voltage lockout.