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KB4863
KB4863
Dual 2.2W Audio Amplifier Plus Stereo Headphone
Function
General Description
The KB4863 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 KB4863 combines dual bridge
speaker amplifiers and stereo headphone amplifiers on one
chip.
The KB4863 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 KB4863MTE or KB4863LQ that has been properly mounted to
a circuit board will deliver 2.2W into 4Ω. The other package options for the
KB4863 will deliver 1.1W into 8Ω. See the Application Information sections
for further information concerning the KB4863MTE and KB4863LQ.
Note 2:
An KB4863MTE or KB4863LQ 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
KB4863LQ, 3Ω, 4Ω loads
2.5W(typ), 2.2W(typ)
n
KB4863MTE, 3Ω, 4Ω loads
2.5W(typ), 2.2W(typ)
n
KB4863MTE, 8Ω load
1.1W(typ)
n
KB4863, 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
n
n
n
n
Stereo headphone amplifier mode
“Click and pop” suppression circuitry
Unity-gain stable
Thermal shutdown protection circuitry
SOIC, DIP, TSSOP and exposed-DAP TSSOP and LLP
packages
Applications
n
Multimedia monitors
n
Portable and desktop computers
n
Portable televisions
Typical Application
Note: Pin out shown for DIP and SO packages. Refer to the Connection Diagrams for the pinout of the TSSOP, Exposed-DAP TSSOP, and Exposed-DAP
LLP packages.
Rev: 1.1
1/19
2005-12-05
KINGBOR [ KINGBOR TECHNOLOGY CO ]
