LM389 Datasheet, PDF (1/8 Pages) National Semiconductor (TI) – LM389 Low Voltage Audio Power Amplifier with NPN Transistor Array

December 1994
LM389 Low Voltage Audio Power Amplifier
with NPN Transistor Array
General Description
The LM389 is an array of three NPN transistors on the same
substrate with an audio power amplifier similar to the
LM386
The amplifier inputs are ground referenced while the output
is automatically biased to one half the supply voltage The
gain is internally set at 20 to minimize external parts but the
addition of an external resistor and capacitor between pins
4 and 12 will increase the gain to any value up to 200
The three transistors have high gain and excellent matching
characteristics They are well suited to a wide variety of ap-
plications in DC through VHF systems
Features
Amplifier
Y _{Battery operation}
Y _{Minimum external parts}
Y _{Wide supply voltage range}
Y _{Low quiescent current drain}
Y _{Voltage gains from 20 to 200}
Y _{Ground referenced input}
Y _{Self-centering output quiescent voltage}
Y _{Low distortion}
Transistors
Y _{Operation from 1 mA to 25 mA}
Y _{Frequency range from DC to 100 MHz}
Y _{Excellent matching}
Applications
Y _{AM-FM radios}
Y _{Portable tape recorders}
Y _Intercoms
Y _{Toys and games}
Y _{Walkie-talkies}
Y _{Portable phonographs}
Y _{Power converters}
Equivalent Schematic and Connection Diagrams
Dual-In-Line Package
TL H 7847 – 1
Order Number LM389N
See NS Package Number N18A
TL H 7847 – 2
C1995 National Semiconductor Corporation TL H 7847
RRD-B30M115 Printed in U S A