The ADP123 from Analog Devices is a LDO Voltage Regulator with Input Voltage 2.3 to 5.5 V, Output Voltage 0.8 to 5 V, Dropout Voltage 3 to 150 mV, Output Current 0.3 A, Quiescent Current 0.045 to 0.17 mA. Tags: Surface Mount. More details for ADP123 can be seen below.