LM386
Low Voltage Audio Power AmplifierThe LM386 is a low voltage audio power amplifier from Texas Instruments. View the full LM386 datasheet below including electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
Low Voltage Audio Power Amplifier
Overview
Part: LM386 Low Voltage Audio Power Amplifier from Texas Instruments
Type: Low Voltage Audio Power Amplifier
Description: A low voltage audio power amplifier designed for consumer applications, featuring a wide 4–18 V supply range, internally set gain of 20 (adjustable to 200), and up to 1 W output power.
Operating Conditions:
- Supply voltage: 4–18 V
- Operating temperature: 0 to 70 °C
- Speaker Impedance: 4 Ω
- Analog input voltage: -0.4 to 0.4 V
Absolute Maximum Ratings:
- Max supply voltage: 22 V (for LM386N-4), 15 V (for LM386N-1/-3, LM386M-1)
- Max storage temperature: -65 to 150 °C
Key Specs:
- Quiescent Current: 4 mA (Typ, V S = 6 V, V IN = 0)
- Output Power: 325 mW (Typ, V S = 6 V, R L = 8 Ω, THD = 10%)
- Output Power: 1000 mW (Typ, V S = 16 V, R L = 32 Ω, THD = 10%)
- Voltage Gain: 26 dB (Typ, V S = 6 V, f = 1 kHz, Pins 1 and 8 Open)
- Voltage Gain: 46 dB (Typ, V S = 6 V, f = 1 kHz, 10 μF from Pin 1 to 8)
- Bandwidth: 300 kHz (Typ, V S = 6 V, Pins 1 and 8 Open)
- Total Harmonic Distortion: 0.2% (Typ, V S = 6 V, R L = 8 Ω, POUT = 125mW, f = 1 kHz, Pins 1 and 8 Open)
- Power Supply Rejection Ratio: 50 dB (Typ, V S = 6 V, f = 1 kHz, CBYPASS = 10 μF)
- Input Resistance: 50 kΩ (Typ)
Features:
- Battery Operation
- Minimum External Parts
- Wide Supply Voltage Range: 4 V-12 V or 5 V-18 V
- Low Quiescent Current Drain: 4 mA
- Voltage Gains from 20 to 200
- Ground-Referenced Input
- Self-Centering Output Quiescent Voltage
- Low Distortion: 0.2% (AV = 20, VS = 6 V, RL = 8 Ω, PO = 125 mW, f = 1 kHz)
- Available in 8-Pin MSOP Package
Applications:
- AM-FM Radio Amplifiers
- Portable Tape Player Amplifiers
- Intercoms
- TV Sound Systems
- Line Drivers
- Ultrasonic Drivers
- Small Servo Drivers
- Power Converters
Package:
- PDIP (8)
- SOIC (8)
- VSSOP (8)
Features
- Battery Operation
- Minimum External Parts
- Wide Supply Voltage Range: 4 V-12 V or 5 V-18 V
- Low Quiescent Current Drain: 4 mA
- Voltage Gains from 20 to 200
- Ground-Referenced Input
- Self-Centering Output Quiescent Voltage
- Low Distortion: 0.2% (AV = 20, VS = 6 V, RL = 8 Ω, PO = 125 mW, f = 1 kHz)
- Available in 8-Pin MSOP Package
Applications
- AM-FM Radio Amplifiers
- Portable Tape Player Amplifiers
- Intercoms
- TV Sound Systems
- Line Drivers
- Ultrasonic Drivers
- Small Servo Drivers
- Power Converters
LM386
SNAS545D - MAY 2004 - REVISED AUGUST 2023
Pin Configuration
Figure 5-1. D Package 8-Pin MSOP Top View
Table 5-1. Pin Functions
| PIN | PIN | TYPE (1) |
|---|---|---|
| NAME | NO. | |
| GAIN | 1 | - |
| -INPUT | 2 | I |
| +INPUT | 3 | I |
| GND | 4 | P |
| V OUT | 5 | O |
| V S | 6 | P |
| BYPASS | 7 | O |
| GAIN | 8 | - |
(1) I = Input, O = Output, P = Power
Table 5-1. Pin Functions
Electrical Characteristics
over operating free-air temperature range (unless otherwise noted)
| PARAMETER | PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|---|
| V S | Operating Supply Voltage | LM386N-1, -3, LM386M-1, LM386MM-1 | 4 | 12 | V | |
| V S | Operating Supply Voltage | LM386N-4 | 5 | 18 | V | |
| I Q | Quiescent Current | V S = 6 V, V IN = 0 | 4 | 8 | mA | |
| P OUT | Output Power | V S = 6 V, R L = 8 Ω, THD = 10% (LM386N-1, LM386M-1, LM386MM-1) | 250 | 325 | mW | |
| P OUT | Output Power | V S = 9 V, R L = 8 Ω, THD = 10% (LM386N-3) | 500 | 700 | mW | |
| P OUT | Output Power | V S = 16 V, R L = 32 Ω, THD = 10% (LM386N-4) | 700 | 1000 | mW | |
| A V | Voltage Gain | V S = 6 V, f = 1 kHz | 26 | dB | ||
| A V | Voltage Gain | 10 μF from Pin 1 to 8 | 46 | dB | ||
| BW | Bandwidth | V S = 6 V, Pins 1 and 8 Open | 300 | kHz | ||
| THD | Total Harmonic Distortion | V S = 6 V, R L = 8 Ω, POUT = 125mW f = 1 kHz, Pins 1 and 8 Open | 0.2% | |||
| PSRR | Power Supply Rejection Ratio | V S = 6 V, f = 1 kHz, CBYPASS = 10 μF Pins 1 and 8 Open, Referred to Output | 50 | dB | ||
| R IN | Input Resistance | 50 | kΩ | |||
| I BIAS | Input Bias Current | V S = 6 V, Pins 2 and 3 Open | 250 | nA |
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Supply Voltage, V CC | LM386N-1/-3, LM386M-1 | 15 | V | |
| Supply Voltage, V CC | LM386N-4 | 22 | V | |
| Package | LM386N | 1.25 | W | |
| Package | LM386M | 0.73 | W | |
| Package | LM386MM-1 | 0.595 | W | |
| Input Voltage, V I | Input Voltage, V I | -0.4 | 0.4 | V |
| Storage temperature, T stg | Storage temperature, T stg | -65 | 150 | °C |
Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
| MIN | NOM | MAX | UNIT | ||
|---|---|---|---|---|---|
| V CC | Supply Voltage | 4 | 12 | V | |
| V CC | LM386N-4 | 5 | 18 | V | |
| Speaker Impedance | 4 | Ω | |||
| VI | Analog input voltage | -0.4 | 0.4 | V | |
| TA | Operating free-air temperature | 0 | 70 | °C |
Thermal Information
| THERMAL METRIC (1) | LM386 D (SOIC) | LM386 DGK (VSSOP) | LM386 P (PDIP) | UNIT | |
|---|---|---|---|---|---|
| 8 | 8 | 8 | |||
| R θJA | Junction-to-ambient thermal resistance | 115.7 | 169.3 | 53.4 | °C/W |
| R θJC(top) | Junction-to-case (top) thermal resistance | 59.7 | 73.1 | 42.1 | °C/W |
| R θJB | Junction-to-board thermal resistance | 56.2 | 100.2 | 30.6 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 12.4 | 9.2 | 19 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 55.6 | 99.1 | 50.5 | °C/W |
Typical Application
Below are shown different setups that show how the LM386 can be implemented in a variety of applications.
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