
LM386
Low Voltage Audio Power Amplifier
General Description
The LM386 is a power amplifier designed for use in low volt-
age consumer applications. The gain is internally set to 20 to
keep external part count low, but the addition of an external
resistor and capacitor between pins 1 and 8 will increase the
gain to any value from 20 to 200.
The inputs are ground referenced while the output automati-
cally biases to one-half the supply voltage. The quiescent
power drain is only 24 milliwatts when operating from a 6 volt
supply, making the LM386 ideal for battery operation.
Features
n
Battery operation
n
Minimum external parts
n
Wide supply voltage range: 4V–12V or 5V–18V
n
Low quiescent current drain: 4mA
n
Voltage gains from 20 to 200
n
Ground referenced input
n
Self-centering output quiescent voltage
n
Low distortion: 0.2% (A
V = 20, VS =6V, RL =8,PO =
125mW, f = 1kHz)
n
Available in 8 pin MSOP package
Applications
n
AM-FM radio amplifiers
n
Portable tape player amplifiers
n
Intercoms
n
TV sound systems
n
Line drivers
n
Ultrasonic drivers
n
Small servo drivers
n
Power converters
Equivalent Schematic and Connection Diagrams
DS006976-1
Small Outline,
Molded Mini Small Outline,
and Dual-In-Line Packages
DS006976-2
Top View
Order Number LM386M-1,
LM386MM-1, LM386N-1,
LM386N-3 or LM386N-4
See NS Package Number
M08A, MUA08A or N08E
August 2000
LM386
Low
V
oltage
Audio
Power
Amplifier
2000 National Semiconductor Corporation
DS006976
www.national.com