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LM4888 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4888 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 23 page  LM4888 Dual 2.1W Audio Amplifier Plus Stereo Headphone & 3D Enhancement General Description The LM4888 is a dual bridge-connected audio power ampli- fier which, when connected to a 5V supply, will deliver 2.1W toa4 Ω 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 pro- vides 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 head- phone 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 components. To sim- plify audio system design, the LM4888SQ combines dual bridge speaker amplifiers and stereo headphone amplifiers on one chip. The LM4888SQ features a low-power consumption shut- down 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 4 Ω. 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 3 Ω. Key Specifications j PO at 1% THD+N, VDD =5V R L =3 Ω 2.4W (typ) R L =4 Ω 2.1W (typ) R L =8 Ω 1.3W (typ) j Single-ended mode THD+N at 75mW into 32 Ω (5V, 1kHz) 0.01% (typ) j Shutdown current 0.04µA (typ) j Supply voltage range 2.7V to 5.5V j PSRR at 217Hz 85dB (typ) Features n National 3D Enhancement n Selectable headphone enable modes n Stereo headphone amplifier mode n Improved “click and pop” suppression circuitry n Thermal shutdown protection circuitry n PCB area-saving SQ package n Micro power shutdown mode Applications n Cell phones n Multimedia monitors n Portable and desktop computers n Portable audio systems Connection Diagrams LM4888SQ LM4888SQ Top Mark 20111628 Top View Order Number LM4888SQ See NS Package Number SQA24A 201116C6 Top View U = Fab Code Z = Assembly Plant Code XY = Date Code TT = Die Traceability Boomer® is a registered trademark of National Semiconductor Corporation. March 2006 © 2006 National Semiconductor Corporation DS201116 www.national.com |
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