LM380 2.5W Audio Power Amplifier

27 December 2019 - 0 Comments

LM380 2.5W Audio Power Amplifier

LM380 Pinout

The LM380 is a 2.5W power audio amplifier for consumer applications. In order to hold system costs to a minimum, the gain is internally fixed at 34 dB. The output of LM380 is short circuit proof with internal thermal limiting.

Pin Description of LM380 IC

Pin Number	Pin Name	Description
1	Bypass	Bypass pin is used for connecting a decoupling capacitor
2	Non-Inverting Input (IN+)	The Non-Inverting pin is provided with the audio signal
3,4,5,7, 10, 11, 12	GND	Ground Pins
6	Inverting Input (IN-)	The Inverting Pin of an amplifier is normally grounded
8	V_OUT	The output pin of the amplifier
14	V_CC	Connected to power
9, 13	NC	Not Connected

LM380 Audio amplifier features and specifications

Supply Voltage: 10-22V
Quiescent Power: 0.13W @ 18V
Voltage Gain: Fixed at 50
High Peak Current Capability: 1.3A
Input Referenced to GND
High Input Impedance: 150kΩ
Low Distortion
Quiescent Output Voltage is at One-Half of the Supply Voltage
Available in 8-Pin & 14- Pin PDIP packages

Equivalent for LM380: LM386

Alternatives Audio Amplifiers: LM4871, AD620, IC6283, JRC45558

Where to use the LM380 Audio Amplifier

The LM380 is a low power audio amplifier used especially for power audio amplification purposes. The IC comes in 8-pin and 14-pin PDIP package and has a wide operating range hence it is highly easy to use. This IC can easily drive an 8-ohm speaker with a variable gain of 20 to200. The IC

So, if you are looking for an audio amplifier IC which can be powered using a battery for a portable application to drive an 8-ohm speaker then this IC might be the right choice for you.

How to use LM380 Audio Amplifier IC

The LM380 only requires a couple of capacitors and resistors to start working. A very basic commonly used circuit for LM380 is shown below.

LM380 Internal Circuit

The IC is powered using the pin 14 and the ground pin 4 is connected to the ground. The inverting pin is normally grounded and the Non-inverting pin is provided with the audio signal. This audio signal can be from a microphone or even from a 3.5mm jack. The 10k resistor is added in series with the audio signal to act as a volume control. You can ignore this potentiometer if you want to operate in full volume. This IC comes with a fixed voltage gain of 50dB.