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LM4870MNSN/a85avai1.1W Audio Power Amplifier with Shutdown Mode


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LM4870M
1.1W Audio Power Amplifier with Shutdown Mode
LM4870
1.1W Audio Power Amplifier with Shutdown Mode
General Description

The LM4870is abridge-connected audio poweramplifierca-
pableof delivering 1.1Wof continuous average powertoan
8Ωload withlessthan0.5% THD+N overthe audiospectrum
froma5V power supply.
Boomer audiopower amplifiers were designed specificallyto
provide high quality output powerwitha minimal numberof
external components. Sincethe LM4870 doesnot require
output coupling capacitors, bootstrap capacitorsor snubber
networks,itis optimally suitedfor low-power portable sys-
tems.
The LM4870 featuresan externally controlled, low-power
consumption shutdown mode,aswellasan internal thermal
shutdown protection mechanism.It also includestwo head-
phone control inputsanda headphone sense outputforex-
ternal monitoring. The LM4870is unity-gain stable andthe
gainisset using external resistors.
Key Specifications
THD+Nat1Winto8Ω 0.5% (max) Output powerinto8Ωat 1kHz 10%THD+N
1.5W (typ) Shutdown Current 0.6μA (typ)
Features
No output coupling capacitors, bootstrap capacitors,or
snubber circuitsare necessary Small Outline (SOIC) power packaging Unity-gain stable External gain configuration capability
Applications
Personal computers Desktop computers Low voltage audio system
Typical Application Connection Diagram
Boomer®isaregistered
trademarkof NationalSemiconductor Corporation.
DS100094-1
FIGURE1. Typical Audio Amplifier Application Circuit
Small Outline Package

DS100094-2
Top View
Order Number LM4870M
SeeNS Package Number M16A

October 1997
LM4870
1.1W
Audio
Power
Amplifier
with
Shutdown
Mode

©1999 National Semiconductor Corporation DS100094
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