LM323 Datasheet PDF – 3A, 5V, Positive Voltage Regulator

What is LM323?

It is part of the LM3xx series of regulators, which are widely used in electronic circuits to regulate and stabilize the DC voltage. This regulator has an internal current-limiting and thermal-shutdown feature that provides protection against overcurrent and overtemperature conditions. It also has a low dropout voltage, which means it can regulate a voltage that is very close to its output voltage.

Function: 3A, 5V, Three-Terminal Positive Voltage Regulator

Package: TO-220 Type

Manufacturer: STMicroelectronics



The LM323 are three-terminal positive voltage regulators with a preset 5V output and a load driving capability of 3A. New circuit design and processing techniques are used to provide the high output current without sacrificing the regulation characteristics of lower current devices.

The 3A regulator is virtually blowout proof.

Current limiting, power limiting and thermal shut-down provide high level of reliability. An overall worst case specification for the combined effects of input voltage, load current, ambient temperature, and power dissipation ensure that the LM323 will perform satisfactorily as a system element.



The 3 A regulator is virtually blowout proof.

• Output current: 3 A
• Internal current and thermal limiting
• Typical output impedance: 0.01 Ω
• Minimum input voltage: 7.5 V
• Power dissipation: 30 W

LM323 datasheet

It is commonly used in power supplies, battery chargers, and other applications that require a regulated DC voltage.

Official site : http://www.st.com/

LM323 Datasheet PDF Download

LM323 pdf
Other data sheets are available within the file: LM323T

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