LM4863 Datasheet | National Semiconductor

Description The LM4863 is a dual bridge-connected audio power amplifier which, when connected to a 5V supply, will deliver 2.2W to a 4Ω load (Note 1) or 2.5W 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. 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 LM4863 bines dual bridge speaker amplifiers and stereo headphone amplifiers on one chip. The LM4863 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 LM4863MTE which has been properly mounted to the circuit board will deliver 2.2W into 4Ω. The other package options for the LM4863 will deliver 1.1W into 8Ω. See the Application Information section for LM4863MTE usage information. Note 2: An LM4863MTE which has been properly mounted to the circuit board and forced-air cooled will deliver 2.5W into 3Ω. Key Specifications n PO at 1% THD+N into 3Ω (LM4863MTE) into 4Ω (LM4863MTE) into 8Ω (LM4863) n Single-ended mode - THD+N at 75m W into 32Ω n Shutdown current 2.5W(typ) 2.2W(typ) 1.1W(typ) 0.5%(max) 0.7µA(typ) Features n n n n n Stereo headphone amplifier mode “Click and pop” suppression circuitry Unity-gain stable Thermal shutdown protection circuitry Exposed-DAP TSSOP, TSSOP, SOIC and DIP packaging available Applications n Multimedia monitors n Portable and desktop puters n Portable televisions Typical Application DS012881-1 - Refer to the section Proper Selection of External ponents, for a detailed discussion of CB size. FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® is a registered trademark of National Semiconductor Corporation. © 1999 National...