LM4863_06 Datasheet, PDF (1/21 Pages) National Semiconductor (TI) – Dual 2.2W Audio Amplifier Plus Stereo Headphone Function

October 2006
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
to a 4Ω 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
allows the amplifiers to operate in single-ended mode when
driving 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 or LM4863LQ that has been properly mounted to
a circuit board will deliver 2.2W into 4Ω. The other package options for the
LM4863 will deliver 1.1W into 8Ω. See the Application Information sections
for further information concerning the LM4863MTE and LM4863LQ.
Note 2: An LM4863MTE or LM4863LQ that has been properly mounted to a
circuit board and forced-air cooled will deliver 2.5W into 3Ω.
Key Specifications
n P_O at 1% THD+N
n LM4863LQ, 3Ω, 4Ω loads
2.5W(typ), 2.2W(typ)
n LM4863MTE, 3Ω, 4Ω loads
2.5W(typ), 2.2W(typ)
n LM4863MTE, 8Ω load
1.1W(typ)
n LM4863, 8Ω
1.1W(typ)
n Single-ended mode THD+N at 75mW into
32Ω
0.5%(max)
n Shutdown current
0.7µA(typ)
n Supply voltage range
2.0V to 5.5V
Features
n Stereo headphone amplifier mode
n “Click and pop” suppression circuitry
n Unity-gain stable
n Thermal shutdown protection circuitry
n SOIC, TSSOP, exposed-DAP TSSOP, and LLP
packages
* Not recommended for new designs. Contact NSC Audio
Marketing.
Applications
n Multimedia monitors
n Portable and desktop computers
n Portable televisions
Typical Application
01288101
Note: Pin out shown for SO package. Refer to the Connection Diagrams for the pinout of the TSSOP, Exposed-DAP TSSOP, and Exposed-DAP LLP
packages.
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS012881
www.national.com