LT1121CN8 by Linear Technology -- Micropower Low Dropout Regulators with Shutdown.
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, 30mA operating
and 16mA 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.
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 0.33mF on the output while
most older devices require between 1mF and 100mF for
stability. Small ceramic capacitors can be used, enhancing
manufacturability. Also the input may be connected to
ground or a reverse voltage without reverse current flow
from output to input. This makes the LT1121 series ideal
for backup power situations where the output is held high
and the input is at ground or reversed. Under these
conditions only 16mA will flow from the output pin to ground.
FEATURES:
- 0.4V Dropout Voltage
- 150mA Output Current
- 30mA 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
- 16mA Quiescent Current in Shutdown
- Stable with 0.33mF 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
These are in very good condition.
