View lt1121 datasheet:

LT1121/LT1121-3.3/LT1121-5 Micropower Low Dropout Regulators with Shutdown DESCRIPTIO FEATURES The LT1121/LT1121-3.3/LT1121-5 are micropower low 0.4V Dropout Voltage dropout regulators with shutdown. These devices are 150mA Output Current capable of supplying 150mA of output current with a 30µA Quiescent Current dropout voltage of 0.4V. Designed for use in battery- No Protection Diodes Needed powered systems, the low quiescent current, 30µA oper- Adjustable Output from 3.8V to 20V ating and 16µA in shutdown, makes them an ideal choice. 3.3V and 5V Fixed Output Voltages The quiescent current is well-controlled; it does not rise in Controlled Quiescent Current in Dropout dropout as it does with many other low dropout PNP Shutdown regulators. 16µA Quiescent Current in Sh