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LM4873 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4873
Description  Dual 2.1W Audio Amplifier Plus Stereo Headphone Function
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM4873 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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LM4873
Dual 2.1W Audio Amplifier Plus Stereo Headphone
Function
General Description
The LM4873 is a dual bridge-connected audio power ampli-
fier which, when connected to a 5V supply, will deliver 2.1W
toa4
Ω 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 LM4873 combines dual bridge
speaker amplifiers and stereo headphone amplifiers on one
chip.
The LM4873 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 LM4873MTE-1, LM4873MTE, or LM4873LQ that has been
properly mounted to a circuit board will deliver 2.1W into 4
Ω. The other
package options for the LM4873 will deliver 1.1W into 8
Ω. See the Applica-
tion
Information
sections
for
further
information
concerning
the
LM4873MTE-1, LM4873MTE, and the LM4873LQ.
Note 2: An LM4873MTE-1, LM4873MTE, or LM4873LQ that has been prop-
erly mounted to a circuit board and forced-air cooled will deliver 2.4W into 3
Ω.
Key Specifications
j PO at 1% THD+N
LM4873LQ, 3
Ω,4Ω loads
2.4W(typ), 2.1W(typ)
LM4873MTE-1, 3
Ω,4Ω loads 2.4W(typ), 2.1W(typ)
LM4873IBL, 8
Ω load
1.1W(typ)
LM4873MTE, 4
1.9W(typ)
LM4873, 8
1.1W(typ)
j Single-ended mode THD+N
at 75mW into 32
0.5%(max)
j Shutdown current
0.7µA(typ)
j Supply voltage range
2V to 5.5V
Features
n
Input mux control and two separate inputs per channel
n
Stereo headphone amplifier mode
n
“Click and pop” suppression circuitry
n
Thermal shutdown protection circuitry
n
PCB area-saving micro SMD and thin micro SMD
packages
n
TSSOP and exposed-DAP TSSOP and LLP packages
Applications
n
Multimedia monitors
n
Portable and desktop computers
n
Portable audio systems
Connection Diagrams
10099330
Top View
Order Number LM4873MTE-1
See NS Package Number MXA28A for Exposed-DAP
TSSOP
10099302
Top View
Order Number LM4873MT, LM4873MTE
See NS Package Number MTC20 for TSSOP
See NS Package Number MXA20A for Exposed-DAP
TSSOP
Boomer® is a registered trademark of National Semiconductor Corporation.
October 2002
© 2002 National Semiconductor Corporation
DS100993
www.national.com


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