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LM4863 Fiches technique(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No de pièce LM4863
Description  Dual 2.2W Audio Amplifier Plus Stereo Headphone Function
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

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LM4863
Dual 2.2W Audio Amplifier Plus Stereo Headphone
Function
General Description
The LM4863 is a dual bridge-connected audio power ampli-
fier which, when connected to a 5V supply, will deliver 2.2W
toa4
Ω load (Note 1) or 2.5W to a 3Ω load (Note 2)with less
than 1.0% THD+N. In addition, the headphone input pin al-
lows the amplifiers to operate in single-ended mode to drive
stereo headphones.
Boomer audio power amplifiers were designed specifically to
provide high quality output power from a surface mount
package while requiring few external components. To sim-
plify audio system design, the LM4863 combines dual bridge
speaker amplifiers and stereo headphone amplifiers on one
chip.
The LM4863 features an externally controlled, low-power
consumption shutdown mode, a stereo headphone amplifier
mode, and thermal shutdown protection. It also utilizes cir-
cuitry to reduce “clicks and pops” during device turn-on.
Note 1:
An LM4863MTE which has been properly mounted to the circuit
board will deliver 2.2W into 4
Ω. The other package options for the LM4863
will deliver 1.1W into 8
Ω. See the Application Information section for
LM4863MTE usage information.
Note 2: An LM4863MTE which has been properly mounted to the circuit
board and forced-air cooled will deliver 2.5W into 3
Ω.
Key Specifications
n PO at 1% THD+N
into 3
Ω (LM4863MTE)
2.5W(typ)
into 4
Ω (LM4863MTE)
2.2W(typ)
into 8
Ω (LM4863)
1.1W(typ)
n Single-ended mode - THD+N
at 75mW into 32
0.5%(max)
n Shutdown current
0.7µA(typ)
Features
n Stereo headphone amplifier mode
n “Click and pop” suppression circuitry
n Unity-gain stable
n Thermal shutdown protection circuitry
n Exposed-DAP TSSOP, TSSOP, SOIC and DIP
packaging available
Applications
n Multimedia monitors
n Portable and desktop computers
n Portable televisions
Typical Application
Boomer® is a registered trademark of National Semiconductor Corporation.
DS012881-1
* Refer to the section Proper Selection of External Components, for a detailed discussion of CB size.
FIGURE 1. Typical Audio Amplifier Application Circuit
October 1999
© 1999 National Semiconductor Corporation
DS012881
www.national.com


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