LM4883 Datasheet | National Semiconductor

Description The LM4883 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 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 closedloop 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 LM4883SQ bines dual bridge speaker amplifiers and stereo headphone amplifiers on one chip. The LM4883SQ features an internally 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 LM4883SQ that has been properly mounted to a circuit board will deliver 2.1W into 4Ω. See the Application Information sections for further information concerning the LM4883SQ. Note 2: An LM4883SQ that has been properly mounted to a circuit board and forced-air cooled will deliver 2.4W into 3Ω. Key Specifications j PO at 1% THD+N RL = 3Ω RL = 4Ω RL = 8Ω j Single-ended mode THD+N 2.4W (typ) 2.1W (typ) 1.3W (typ) 0.01% (typ) 0.04µA (typ) 2.4V to 5.5V 85d B (typ) at 75m W into 32Ω (5V, 1k Hz) j Shutdown current j Supply voltage range j PSRR at 217Hz Features n n n n n Input mux control and two separate inputs per channel Stereo headphone amplifier mode Improved “click and pop” suppression circuitry Thermal shutdown protection circuitry PCB area-saving SQ package Applications n Multimedia monitors n Portable and desktop puters n Portable audio systems Connection Diagrams LM4883SQ LM4883SQ Top Mark 200887C6 Top View U = Fab Code Z = Assembly Plant Code XY =...