LM4863| Datasheet

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LM4863 Dual 2.2W Audio Amplifier Plus Stereo Headphone Function

October 2006

LM4863 Dual 2.2W Audio Amplifier Plus Stereo Headphone Function
General Description
The LM4863 is a dual bridge-connected audio power amplifier which, when connected to a 5V supply, will deliver 2.2W to a 4 load (Note 1) or 2.5W to a 3 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. Boomer audio power amplifiers were designed specifically to provide high quality output power from a surface mount package while requiring few external components. To simplify audio system design, the LM4863 combines 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 or LM4863LQ that has been properly mounted to a circuit board will deliver 2.2W into 4. The other package options for the LM4863 will deliver 1.1W into 8. See the Application Information sections for further information concerning the LM4863MTE and LM4863LQ. Note 2: An LM4863MTE or LM4863LQ that has been properly mounted to a circuit board and forced-air cooled will deliver 2.5W into 3.

Key Specifications
n PO at 1% THD+N n LM4863LQ, 3, 4 loads 2.5W(typ), 2.2W(typ) n LM4863MTE, 3, 4 loads 2.5W(typ), 2.2W(typ) n LM4863MTE, 8 load 1.1W(typ) n LM4863, 8 1.1W(typ) n Single-ended mode THD+N at 75mW into 32 0.5%(max) n Shutdown current 0.7uA(typ) n Supply voltage range 2.0V to 5.5V

Features
Stereo headphone amplifier mode "Click and pop" suppression circuitry Unity-gain stable Thermal shutdown protection circuitry SOIC, TSSOP, exposed-DAP TSSOP, and LLP packages * Not recommended for new designs. Contact NSC Audio Marketing. n n n n n

Applications
n Multimedia monitors n Portable and desktop computers n Portable televisions

Typical Application

01288101

Note: Pin out shown for SO package. Refer to the Connection Diagrams for the pinout of the TSSOP, Exposed-DAP TSSOP, and Exposed-DAP LLP packages.

Boomer is a registered trademark of National Semiconductor Corporation.

2006 National Semiconductor Corporation

DS012881

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