LM4863

Dual 2.2W Audio Amplifier Plus Stereo Headphone

Function

General Description

The LM4863 is a dual bridge-connected audio power ampli-

fier which, when connected to a 5V supply, will deliver 2.2W

toa4

Ω 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 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 sim-

plify 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 cir-

cuitry 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

Ω. The other package options for the

LM4863 will deliver 1.1W into 8

Ω. 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

Ω.

Key Specifications

n

P

n

LM4863LQ, 3

Ω,4Ω loads

2.5W(typ), 2.2W(typ)

n

LM4863MTE, 3

Ω,4Ω loads

2.5W(typ), 2.2W(typ)

n

LM4863MTE, 8

Ω load

1.1W(typ)

n

LM4863, 8

Ω

1.1W(typ)

n

Single-ended mode THD+N at 75mW into

32

Ω

0.5%(max)

n

Shutdown current

0.7µA(typ)

n

Supply voltage range

2.0V to 5.5V

Features

n

Stereo headphone amplifier mode

n

“Click and pop” suppression circuitry

n

Unity-gain stable

n

Thermal shutdown protection circuitry

n

SOIC, TSSOP, exposed-DAP TSSOP, and LLP

packages

* Not recommended for new designs. Contact NSC Audio

Marketing.

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.

October 2006

© 2006 National Semiconductor Corporation

DS012881

www.national.com