LM4873 Datasheet, PDF (1/30 Pages) National Semiconductor (TI) – Dual 2.1W Audio Amplifier Plus Stereo Headphone Function

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
• P_O at 1% THD+N
– LM4873LQ, 3Ω, 4Ω Loads 2.4W (typ), 2.1 W
(typ)
– LM4873MTE-1, 3Ω, 4Ω loads 2.4W (typ), 2.1
W (typ)
– LM4873IBL, 8Ω Load 1.1 W (typ)
– LM4873MTE, 4Ω 1.9 W (typ)
– LM4873, 8Ω 1.1 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 4Ω. The other
package options for the LM4873 will deliver 1.1W into
8Ω. 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 3Ω.
1
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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