The ADP121 is a low quiescent current, CMOS linear regulator that is available in a 5-lead TSOT or 4-ball 0.4 mm pitch WLCSP package. It offers input voltage range of 2.3 V to 5.5 V, output voltage range of 1.2 V to 3.3 V, output current of 150 mA, low quiescent current (IGND = 11 μA, no load; IGND = 30 μA, 150 mA load), low shutdown current (<1 μA), low dropout voltage (90 mV @ 150 mA load), high PSRR (70 dB @ 1 kHz at VOUT = 1.2 V; 70 dB @ 10 kHz at VOUT = 1.2 V), low noise (40 μV rms at VOUT = 1.2 V), no noise bypass capacitor required, output voltage accuracy of ±1%, 16 fixed output voltage options, current limit and thermal overload protection, logic controlled enable, and 5-lead TSOT or 4-ball 0.4 mm pitch WLCSP package.