●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 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.
● 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
●## Key Specifications
● PO 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
●All trademarks are the property of their respective owners.
Part 3D Model
