LM1084 Datasheet – 5A, Low Dropout Positive Regulator

Part Number: LM1084

Function: 5A Low Dropout Positive Regulator

Package: TO-220, TO-263 Type

Manufacturer: National Semiconductor ->Texas Instruments

National Semiconductor was an American semiconductor manufacturer that specialized in analog devices and subsystems. But, this company was acquired by Texas Instruments in 2011.

Image and Pinouts:

LM1084 datasheet


What is LM1084?

The LM1084 is a series of low dropout voltage positive regulators with a maximum dropout of 1.5V at 5A of load current. It has the same pin-out as National Semiconductor’s industry standard LM317. The LM1084 is available in an adjustable version, which can set the output voltage with only two external resistors. It is also available in three fixed voltages: 3.3V, 5.0V and 12.0V. The fixed versions intergrate the adjust resistors. The LM1084 circuit includes a zener trimmed bandgap reference, current limiting and thermal shutdown.

The low dropout voltage positive regulator is designed to operate with a very small difference between the input and output voltages, typically less than 0.5 volts. This allows it to provide a stable output voltage even when the input voltage is close to the output voltage.


LM1084 circuit


1. Available in 3.3V, 5.0V, 12V and Adjustable Versions
2. Current Limiting and Thermal Protection
3. Output Current 5A
4. Industrial Temperature Range −40°C to 125°C
5. Line Regulation 0.015% (typical)
6. Load Regulation 0.1% (typical)


1. Post Regulator for Switching DC/DC Conveter
2. High Efficiency Linear Regulators
3. Battery Charger


Other data sheets are available within the file: LM1084IS-12, LM1084IS-3.3, LM1084IS-5.0, LM1084IS-ADJ

LM1084 Datasheet PDF Download

LM1084 pdf