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LM4869MH ,1.9W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and ShutdownFeaturesand 1.9W (typ) of output power to an 8Ω and 4Ω BTL load(Note 1), respectively, with less th ..
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LM4868LQ-LM4868LQX-LM4868MT-LM4868MTE-LM4868MTX
Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function
LM4868
Output-Transient-Free Dual 2.1W Audio Amplifier Plus Coupling Capacitor Stereo Headphone Function
General DescriptionThe LM4868isa dual bridge-connected audio power ampli-
fier which, when connectedtoa5V supply,will deliver 2.1W
toa4Ω load (Note1)or 2.4Wtoa3Ω load (Note2) with less
than 1.0% THD+N. The LM4868 uses advanced, latest gen-
eration circuitryto eliminateall tracesof clicks and pops
whenthe supply voltageis first applied. The amplifier hasa
headphone-amplifier-select input pin.Itis usedto switchthe
amplifiers from bridgeto single-ended mode for driving
headphones.A new circuit topology eliminates headphone
output coupling capacitors (patent pending).A MUX control
pin allows selection between the two setsof stereo input
signals. The MUX control can alsobe usedto select be-
tween two different customer-specified closed-loop re-
sponses.
Boomer audio power amplifiers are designed specificallyto
provide high quality output power froma surface mount
package and require few external components.To simplify
audio system design, the LM4868 combines dual bridge
speaker amplifiers and stereo headphone amplifiersin one
package.
The LM4868 featuresan externally controlled power-saving
micropower shutdown mode,a stereo headphone amplifier
mode, and thermal shutdown protection.
Note1:An LM4868LQor LM4868MTEthathas been properly mountedto
acircuitboardwill deliver 2.1Winto4Ω.TheMux controlcanalsobe usedto
selecttwo different closed-loop responses. LM4868MTwill deliver 1.1Winto
8Ω.Seethe Application Information sectionsfor further information concern-
ingthe LM4868LQandthe LM4868MT.
Note2:An LM4868LQor LM4868MTEthat hasbeen properlymountedtoa
circuit boardand forced-air cooledwill deliver 2.4Winto3Ω.
Key Specifications POat 1% THD+N LM4868LQ,3Ω load 2.4W (typ) LM4868LQ,4Ω load 2.1W (typ) LM4868MTE,4Ω 1.9W (typ) LM4868MT,8Ω 1.1W (typ) Single-ended mode- THD+Nat 75mW into 32Ω 0.5%
(max) Shutdown current 0.7µA (typ)
Features Advanced “click and pop” suppression circuitry Eliminates headphone amplifier output coupling
capacitors (patent pending) Stereo headphone amplifier mode Input mux control and two separate inputsper channel Thermal shutdown protection circuitry LLP, TSSOP, and exposed-DAP TSSOP packaging
available
Applications Multimedia monitors Portable and desktop computers Portable audio systems
Connection DiagramsTop View
Order Number LM4868MT, LM4868MTE
SeeNS Package Number MTC20for TSSOP
See NS Package Number MXA20Afor Exposed-DAP TSSOP
August 2002
LM4868
Output-T
ransient-Free
Dual
2.1W
Audio
Amplifier
Plus
Coupling
Capacitor
Stereo
Headphone
Function
