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LT1121-5 Datasheet

LT1121-5 Datasheet

Micropower Low Dropout Regulators with Shutdown
Part No.: LT1121-5
Page: 16 Pages
Size: 248 KB
Manufacturer: Linear Technology
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Views: 1
Update Time: 2024-12-05 11:38:15
DataSheet: Download

LT1121-5 Datasheet Applicable Part

Part No. Packing SPQ Marking MSL Pins Temp Range Package Description Buy
LT1121CN8-5#PBF Tube 50 LT1121CN8-5 1 8 0°C ~125°C 8-Lead Plastic PDIP  
LT1121CN8-5#TRPBF Reel   LT1121CN8-5 1 8 0°C ~125°C 8-Lead Plastic PDIP  
LT1121CN8-5#TRMPBF Reel   LT1121CN8-5 1 8 0°C ~125°C 8-Lead Plastic PDIP  
LT1121IN8-5#PBF Tube 50 LT1121IN8-5 1 8 -40°C ~125°C 8-Lead Plastic PDIP  
LT1121IN8-5#TRPBF Reel   LT1121IN8-5 1 8 -40°C ~125°C 8-Lead Plastic PDIP  
LT1121IN8-5#TRMPBF Reel   LT1121IN8-5 1 8 -40°C ~125°C 8-Lead Plastic PDIP  
LT1121CS8-5#PBF Tube 100 11215 1 8 0°C ~125°C 8-Lead Plastic SO  
LT1121CS8-5#TRPBF Reel 2500 11215 1 8 0°C ~125°C 8-Lead Plastic SO  
LT1121CS8-5#TRMPBF Reel 500 11215 1 8 0°C ~125°C 8-Lead Plastic SO  
LT1121IS8-5#PBF Tube 100 121I5 1 8 -40°C ~125°C 8-Lead Plastic S0  
LT1121IS8-5#TRPBF Reel 2500 121I5 1 8 -40°C ~125°C 8-Lead Plastic S0  
LT1121IS8-5#TRMPBF Reel 500 121I5 1 8 -40°C ~125°C 8-Lead Plastic S0  
LT1121ACS8-5#PBF Tube 100 1121A5 1 8 0°C ~125°C 8-Lead Plastic S0  
LT1121ACS8-5#TRPBF Reel 2500 1121A5 1 8 0°C ~125°C 8-Lead Plastic S0  
LT1121ACS8-5#TRMPBF Reel 500 1121A5 1 8 0°C ~125°C 8-Lead Plastic S0  
LT1121AIS8-5#PBF Tube 100 121AI5 1 8 -40°C ~125°C 8-Lead Plastic S0  
LT1121AIS8-5#TRPBF Reel 2500 121AI5 1 8 -40°C ~125°C 8-Lead Plastic S0  
LT1121AIS8-5#TRMPBF Reel 500 121AI5 1 8 -40°C ~125°C 8-Lead Plastic S0  
LT1121CST-5#PBF Tube 78 11215 1 3 0°C ~125°C 3-Lead Plastic SOT-223  
LT1121CST-5#TRPBF Reel 2000 11215 1 3 0°C ~125°C 3-Lead Plastic SOT-223  
LT1121CST-5#TRMPBF Reel 500 11215 1 3 0°C ~125°C 3-Lead Plastic SOT-223  
LT1121IST-5#PBF Tube 78 1121I5 1 3 -40°C ~125°C 3-Lead Plastic SOT-223  
LT1121IST-5#TRPBF Reel 2000 1121I5 1 3 -40°C ~125°C 3-Lead Plastic SOT-223  
LT1121IST-5#TRMPBF Reel 500 1121I5 1 3 -40°C ~125°C 3-Lead Plastic SOT-223  
LT1121CZ-5#PBF Bag 100 LT1121CZ-5 1 3 0°C ~125°C 3-Lead Plastic TO-92  
LT1121CZ-5#TRPBF Reel 2000 LT1121CZ-5 1 3 0°C ~125°C 3-Lead Plastic TO-92  
LT1121CZ-5#TRMPBF Reel 500 LT1121CZ-5 1 3 0°C ~125°C 3-Lead Plastic TO-92  
LT1121IZ-5#PBF Bag 100 LT1121IZ-5 1 3 -40°C ~125°C 3-Lead Plastic TO-92  
LT1121IZ-5#TRPBF Reel 2000 LT1121IZ-5 1 3 -40°C ~125°C 3-Lead Plastic TO-92  
LT1121IZ-5#TRMPBF Reel 500 LT1121IZ-5 1 3 -40°C ~125°C 3-Lead Plastic TO-92  
SPQ:Standard Pack Quantity;MSL:Moisture Sensitivity Level

LT1121-5 Datasheet(PDF)

LT1121-5 Datasheet(Picture)

LT1121-5 Features

  • 0.4V Dropout Voltage
  • 150mA Output Current
  • 30µA Quiescent Current
  • No Protection Diodes Needed
  • Adjustable Output from 3.75V to 30V
  • 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
  • Available in the 8-Lead SO, 8-Lead PDIP, 3-Lead SOT-23 and 3-Lead TO-92 Packages

LT1121-5 Applications

  • Low Current Regulator
  • Regulator for Battery-Powered Systems
  • Post Regulator for Switching Supplies

LT1121-5 Description

The 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.

Other features of the 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 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 16µA will flow from the output pin to ground.

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