[Guide] What is LM380 Audio Power Amplifier 2023

The LM380 audio power amplifier is a versatile and widely-used integrated circuit known for its ability to deliver high-quality audio amplification with a simple and compact design. This single-channel audio amplifier IC is capable of driving speakers with an output power of up to several watts, making it suitable for various audio applications.

 

In this article, we will explore the features, specifications, and applications of the LM380 audio power amplifier, providing valuable insights to help you unleash the potential of this versatile amplifier IC in your audio projects.

What is LM380 Audio Power Amplifier

The LM380 is an audio power amplifier integrated circuit (IC) designed by National Semiconductor (now part of Texas Instruments). It is a popular choice for low-power audio amplification applications. The LM380 is capable of delivering a moderate amount of power to drive small speakers or headphones.

 

Is LM380 a High-power Amplifier?

No, the LM380 is not a high-power amplifier. It is a low-power audio amplifier designed for low to moderate power applications. It typically provides power output in the range of a few watts (up to approximately 2-3 watts) and is suitable for driving small speakers, headphones, or other low-power audio devices.

LM380 Datasheet Download

Learn and Download lm380 datasheet here>>

Features of LM380 Audio Power Amplifier

1. Low-Power Amplification

The LM380 is designed for low-power applications, typically delivering up to a few watts of output power.

2. Single Supply Operation

It can operate from a single power supply, simplifying the circuit design, especially for battery-powered applications.

3. Internal Thermal Protection

The IC incorporates thermal protection circuitry to prevent damage due to excessive heat.

4. Low Distortion

The LM380 is designed to provide low distortion and high-quality audio output.

5. Minimal External Components

The LM380 requires only a few external components, which makes it relatively easy to use in various audio applications.

6. Wide Supply Voltage Range

The LM380 can work with a wide supply voltage range, providing flexibility in different applications.

7. Bridge-Tied Load (BTL) Configuration

The LM380 can be configured in Bridge-Tied Load mode to increase the output power.

8. Small Package Options

The LM380 is available in various package types, including DIP (Dual In-line Package) and TO-220, depending on the manufacturer.

9. Low Quiescent Current

The IC has a low quiescent current, which is beneficial for battery-powered applications, as it helps to conserve power.

10. Internal Gain Setting

The LM380 has an internal gain setting feature, allowing users to adjust the amplification level according to their specific needs.

11. Short-Circuit Protection

The IC includes built-in protection against short-circuits, preventing damage to the device and connected components.

12. Low Noise

The LM380 is designed to provide low noise, ensuring a clean audio signal without significant interference.

13. Suitable for Low Impedance Loads

It can drive low impedance loads, such as small speakers or headphones, effectively.

 

Pinout of LM380 Audio Power Amplifier

The LM380's consists of 14 pins, each with its own significance, and these pin configurations are listed below. In this IC, there are 6 pins that have a familiar function, namely the GND pin. These pins play an important role when precise results are desired from this device.

Pin 1: Bypass Pin

Pin 2: In-phase input

Pin 3: Ground pin

Pin 4: Ground pin

Pin 5: Ground pin

Pin 6: Inverted Input

Pin 7: Ground pin

Pin 8: Output Pin

Pin 9: Normally closed

Pin 10: Ground pin

Pin 11: Ground pin

Pin 12: Ground pin

Pin 13: Normally closed

Pin 14: +VCC

The pinout diagram above can help identify the pinout of the device, so be sure to look at the pinout diagram before using it.

Equivalent LM380 models include: LM311, LM317, LM318, LM324, LM324N, LM335, LM339, LM348, LM358, LM380, LM386, and LM393.

 

Specification of LM380 Audio Power Amplifier 

LM380 device specifications include the following,

• Supply voltage range of 10V to 22V.
• Standard DIP package
• Power consumption as low as 0.13W.
• Less distortion.
• Input impedance up to 50
• Fixed voltage gain of 50
• Current supply capability of 1.3A

Ratings of LM380 Audio Power Amplifier

It is well known that power supply characteristics are largely dependent on device ratings.The ratings of LM380 devices include the following.

Supply voltage 22V

Input voltage of 30V

Operating temperature from -0.3 to 6.3V

Junction temperature of 150°C

Storage temperature is -65 to 150°C

Peak current of + or 1A

Circuit Diagram of LM380 Audio Power Amplifier 

Lm380 typical circuit

 

Phone Amplifier

 

Bridge Amplifier

 

Intercom

Application of LM380 Audio Power Amplifier

The LM380 audio power amplifier is a versatile IC with various applications in low-power audio amplification. Some of the common applications of the LM380 include:

✏ Portable Audio Devices: The LM380 is often used in portable audio devices like MP3 players, portable radios, and portable speakers to amplify audio signals and drive small built-in speakers or headphones.

✏ Intercom Systems: It is utilized in intercom systems for amplifying voice signals, allowing communication between different rooms or areas within a building.

✏ Toys: It is employed in various electronic toys to amplify sound effects and provide audio output from built-in speakers.

✏ Personal Computers and Laptops: In older computer systems, the LM380 was sometimes used for audio amplification, but more advanced audio codecs and amplifiers are now commonly used.

✏ Home Automation: It can be used in home automation projects where audio signals need to be amplified for various applications like alarms or notifications.

✏ Educational Kits: It is sometimes used in educational electronic kits to teach basic audio amplifier circuits and principles.

✏ Small Audio Systems: It can be used in small audio systems like mini hi-fi setups or DIY audio projects where moderate audio power is sufficient.

✏ Walkie-Talkies: The LM380 can be used in walkie-talkies to amplify the audio signals for clear communication.

✏ Portable Communication Devices: It can be used in small communication devices where audio signals need amplification for clear audio output.

LM380 vs LM386: What are the Differences

The LM380 and LM386 are both audio power amplifier ICs, but they have some differences in their features and applications.

Here are the differences,

Feature	LM380	LM386
Power Output	Up to a few watts	Up to 1 watt
Package Types	DIP-8, TO-220	8-pin DIP
Gain Settings	Internal setting	External resistors
Supply Voltage Range	Wide range	Limited range
Bridge-Tied Load (BTL)	Supported	Not supported
Noise and Distortion	Low	Relatively low
Typical Applications	Portable devices, intercom systems, toys, small audio systems	Portable devices, toys, radios, DIY audio projects

Conclusion

In conclusion, the LM380 audio power amplifier stands as a robust and practical solution for amplifying audio signals in various electronic projects. Its straightforward design, low power consumption, and compact size make it an attractive choice for both beginners and experienced designers seeking reliable audio amplification. When using the LM380 audio power amplifier, refer to the datasheet and application notes for optimal circuit design and performance.