LM4888 Datasheet | National Semiconductor

Description The LM4888 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. A user selectable “National 3D Enhancement” mode provides enhanced stereo imaging. The LM4888SQ also has two separate HP (headphone) enable inputs, each having different logic level thresholds. Either HP enable input activates the single ended headphone mode and disables the BTL output mode. The HP Sense input is for use with a normal stereo headphone jack. The remaining input, HP Logic, accepts standard logic level thresholds. 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 LM4888SQ bines dual bridge speaker amplifiers and stereo headphone amplifiers on one chip. The LM4888SQ features a low-power consumption shutdown mode and thermal shutdown protection. It also utilizes circuitry to reduce “clicks and pops” during device turn-on. Note 1: An LM4888SQ 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 LM4888SQ. Note 2: An LM4888SQ 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, VDD = 5V 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) 2.7V 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 n n National 3D Enhancement Selectable headphone enable modes Stereo headphone amplifier mode Improved “click and pop” suppression circuitry Thermal shutdown protection circuitry PCB area-saving SQ package Micro power shutdown mode Applications n n n n Cell phones Multimedia monitors Portable and desktop...