LM4883 Datasheet, PDF (1/23 Pages) National Semiconductor (TI) – Dual 2.1W Audio Amplifier Plus Stereo Headphone

November 2004
LM4883
Dual 2.1W Audio Amplifier Plus Stereo Headphone
Function
General Description
The LM4883 is a dual bridge-connected audio power ampli-
fier which, when connected to a 5V supply, will deliver 2.1W
to a 4Ω load (Note 1) or 2.4W 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. A MUX control pin allows selec-
tion between the two stereo sets of amplifier inputs. The
MUX control can also be used to select two different closed-
loop responses.
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 LM4883SQ combines dual
bridge speaker amplifiers and stereo headphone amplifiers
on one chip.
The LM4883SQ features an internally 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 LM4883SQ that has been properly mounted to a circuit board
will deliver 2.1W into 4Ω. See the Application Information sections for further
information concerning the LM4883SQ.
Note 2: An LM4883SQ that has been properly mounted to a circuit board
and forced-air cooled will deliver 2.4W into 3Ω.
Key Specifications
j P_O at 1% THD+N
R_L = 3Ω
R_L = 4Ω
R_L = 8Ω
j Single-ended mode THD+N
at 75mW into 32Ω (5V, 1kHz)
j Shutdown current
j Supply voltage range
j PSRR at 217Hz
2.4W (typ)
2.1W (typ)
1.3W (typ)
0.01% (typ)
0.04µA (typ)
2.4V to 5.5V
85dB (typ)
Features
n Input mux control and two separate inputs per channel
n Stereo headphone amplifier mode
n Improved “click and pop” suppression circuitry
n Thermal shutdown protection circuitry
n PCB area-saving SQ package
Applications
n Multimedia monitors
n Portable and desktop computers
n Portable audio systems
Connection Diagrams
LM4883SQ
LM4883SQ Top Mark
200887A3
Top View
Order Number LM4883SQ
See NS Package Number SQA24B
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200887
200887C6
Top View
U = Fab Code
Z = Assembly Plant Code
XY = Date Code
TT = Die Traceability
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