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LM4873 Datasheet Preview

LM4873 Datasheet

Dual 2.1W Audio Amplifier

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LM4873
www.ti.com
SNAS033E – AUGUST 2000 – REVISED MAY 2013
LM4873
Dual 2.1W Audio Amplifier Plus Stereo
Headphone Function
Check for Samples: LM4873
FEATURES
1
2 Input Mux Control and Two Separate Inputs
Per Channel
• Stereo Headphone Amplifier Mode
• “Click and Pop” Suppression Circuitry
• Thermal Shutdown Protection Circuitry
• PCB Area-Saving DSBGA and Thin DSBGA
Packages
• TSSOP and HTSSOP and WQFN Packages
APPLICATIONS
• Multimedia Monitors
• Portable and Desktop Computers
• Portable Audio Systems
KEY SPECIFICATIONS
• PO at 1% THD+N
– LM4873LQ, 3, 4Loads 2.4W (typ), 2.1 W
(typ)
– LM4873MTE-1, 3, 4loads 2.4W (typ), 2.1
W (typ)
– LM4873IBL, 8Load 1.1 W (typ)
– LM4873MTE, 41.9 W (typ)
– LM4873, 81.1 W (typ)
• Single-Ended Mode THD+N at 75 mW Into
32Ω 0.5 % (max)
• Shutdown Current 0.7 µA (typ)
• Supply Voltage Range 2 to 5.5 V
DESCRIPTION
The LM4873 is a dual bridge-connected audio power
amplifier which, when connected to a 5V supply, will
deliver 2.1W to a 4Ω load or 2.4W to a 3Ω load with
less than 1.0% THD+N (see Notes below). In
addition, the headphone input pin allows the
amplifiers to operate in single-ended mode when
driving stereo headphones. A MUX control pin allows
selection 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 simplify 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 circuitry to reduce “clicks
and pops” during device turn-on.
Note: An LM4873MTE-1, LM4873MTE, or
LM4873LQ that has been properly mounted to a
circuit board will deliver 2.1W into 4. The other
package options for the LM4873 will deliver 1.1W into
8. See the APPLICATION INFORMATION sections
for further information concerning the LM4873MTE-1,
LM4873MTE, and the LM4873LQ.
Note: An LM4873MTE-1, LM4873MTE, or
LM4873LQ that has been properly mounted to a
circuit board and forced-air cooled will deliver 2.4W
into 3.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2013, Texas Instruments Incorporated




etcTI

LM4873 Datasheet Preview

LM4873 Datasheet

Dual 2.1W Audio Amplifier

No Preview Available !

LM4873
SNAS033E – AUGUST 2000 – REVISED MAY 2013
Connection Diagrams
www.ti.com
Figure 1. Top View
See Package Number PWP0028A
for Exposed-DAP HTSSOP
Figure 2. Top View
See Package Number PW0020A for TSSOP
See Package Number PWP0020A
for Exposed-DAP HTSSOP
Figure 3. Top View
See Package Number NHW0024A
for Exposed-DAP WQFN
Figure 4. Top View
(Bump-side down)
See Package Number BLA20AAB for DSBGA
See Package Number YZR0020AAA
Pin (Bump) Number
A1
A2
A3
A4
B1
B2
B3
B4
C1
C2
LM4873IBP PIN DESIGNATIONS
Pin (Bump) Function
Pin (Bump) Number
-IN A1
C3
-IN A2
C4
-IN B2
D1
-IN B1
D2
-OUT A
D3
GND
D4
GND
E1
-OUT B
E2
+IN A
E3
VDD
E4
Pin (Bump) Function
VDD
+IN B
+OUT A
GND
GND
+OUT B
MUX CTRL
SHUTDOWN
HP-IN
BYPASS
2
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Product Folder Links: LM4873
Copyright © 2000–2013, Texas Instruments Incorporated



Part Number LM4873
Description Dual 2.1W Audio Amplifier
Maker etcTI
Total Page 3 Pages
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LM4873 Datasheet PDF





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