DESCRIPTION
The LT1121/LT1121-3.3/LT1121-5 are micropower low dropout regulators with shutdown. These devices are capable of supplying 150mA of output current with a dropout voltage of 0.4V. Designed for use in batterypowered systems, the low quiescent current, 30µA operating and 16µA in shutdown, makes them an ideal choice. The quiescent current is well-controlled; it does not rise in dropout as it does with many other low dropout PNP regulators.

FEATURES
■ 0.4V Dropout Voltage
■ 150mA Output Current
■ 30µA Quiescent Current
■ No Protection Diodes Needed
■ Adjustable Output from 3.8V to 20V
■ 3.3V and 5V Fixed Output Voltages
■ Controlled Quiescent Current in Dropout
■ Shutdown
■ 16µA Quiescent Current in Shutdown
■ Stable with 0.33µF Output Capacitor
■ Reverse Battery Protection
■ No Reverse Current with Input Low
■ Thermal Limiting

APPLICATIONS
■ Low Current Regulator
■ Regulator for Battery-Powered Systems
■ Post Regulator for Switching Supplies