LM4873 Datasheet | National Semiconductor

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 (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 to drive stereo headphones. A Mux Control pin toggles between the two stereo sets of amplifier inputs, allowing for two selectable amplifier 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 ponents. To simplify audio system design, the LM4873 bines 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 1: An LM4873MTE-1 which has been properly mounted to the 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 section for LM4873MTE-1 usage information. Note 2: An LM4873MTE-1 which has been properly mounted to the circuit board and forced-air cooled will deliver 2.4W into 3Ω. Key Specifications n PO at 1% THD+N into 3Ω (LM4873MTE-1) into 4Ω (LM4873MTE-1) into 4Ω (LM4873MTE) into 8Ω (LM4873) n Single-ended mode - THD+N at 75m W into 32Ω n Shutdown current 2.4W(typ) 2.1W(typ) 1.9W(typ) 1.1W(typ) 0.5%(max) 0.7µA(typ) Features n n n n n Input mux control and two separate inputs per channel Stereo headphone amplifier mode “Click and pop” suppression circuitry Thermal shutdown protection circuitry Exposed-DAP TSSOP and TSSOP packaging available Applications n Multimedia monitors n Portable and desktop puters n Portable audio systems Typical Application DS100993-31 - Refer to the section Proper Selection of External...