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LM389N
LM389 Low Voltage Audio Power Amplifier with NPN Transistor Array
TL/H/7847
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 LM389is anarrayof three NPN transistorson thesame
substrate withan audio power amplifier similartothe
LM386.
The amplifier inputsare ground referenced whilethe output automatically biasedto onehalfthe supply voltage.The
gainis internallysetat20to minimize external parts, butthe
additionofan external resistorand capacitor between pinsand12will increasethe gaintoany valueupto 200.
The three transistorshave high gainand excellent matching
characteristics. Theyarewell suitedtoa wide varietyofap-
plicationsinDC through VHF systems.
Features
Amplifier Battery operation Minimum external parts Wide supply voltage range Low quiescent current drain Voltage gains from20to200 Ground referenced input Self-centering output quiescent voltage Low distortion
Transistors Operation from1 mAto25mA Frequency range fromDCto100 MHz Excellent matching
Applications AM-FM radios Portable tape recorders Intercoms Toys and games Walkie-talkies Portable phonographs Power converters
Equivalent Schematic and Connection Diagrams
TL/H/7847–1
Dual-In-Line Package
TL/H/7847–2
Order Number LM389N
SeeNS PackageNumberN18A
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
