Datasheet Analog Devices LT1121CN8-3.3#PBF

LT1121/LT1121-3.3/LT1121-5
Micropower Low Dropout
Regulators with Shutdown
FEATURES DESCRIPTION 0.4V Dropout Voltage
n 150mA Output Current
n 30µA Quiescent Current
n No Protection Diodes Needed
n Adjustable Output from 3.75V to 30V
n 3.3V and 5V Fixed Output Voltages
n Controlled Quiescent Current in Dropout
n Shutdow 16µA Quiescent Current in Shutdow Stable with 0.33µF Output Capacitor
n Reverse Battery Protectio No Reverse Current with Input Low n Thermal Limiting
n Available in the 8-Lead SO, 8-Lead PDIP, 3-Lead SOT-23 and 3-Lead TO-92 Packages The LT®1121/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 battery-powered 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. n APPLICATIONS Low Current Regulator Regulator for Battery-Powered Systems
n Post Regulator for Switching Supplies Other features of the LT1121/LT1121-3.3/LT1121-5 include
the ability to operate with very small output capacitors.
They are stable with only 0.33µF on the output while most
older devices require between 1µF and 100µF for stability.
Small ceramic capacitors can be used, enhancing manufacturability. Also the input may be connected to ground …