KB4863

Dual 2.2W Audio Amplifier Plus Stereo Headphone

Function

General Description

The KB4863 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 KB4863 combines dual bridge

speaker amplifiers and stereo headphone amplifiers on one

chip.

The KB4863 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 KB4863MTE or KB4863LQ that has been properly mounted to

a circuit board will deliver 2.2W into 4

Ω. The other package options for the

KB4863 will deliver 1.1W into 8

Ω. See the Application Information sections

for further information concerning the KB4863MTE and KB4863LQ.

Note 2: An KB4863MTE or KB4863LQ 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

KB4863LQ, 3

Ω,4Ω loads

2.5W(typ), 2.2W(typ)

n

KB4863MTE, 3

Ω,4Ω loads

2.5W(typ), 2.2W(typ)

n

KB4863MTE, 8

Ω load

1.1W(typ)

n

KB4863, 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, DIP, TSSOP and exposed-DAP TSSOP and LLP

packages

Applications

n Multimedia monitors

n Portable and desktop computers

n Portable televisions

Typical Application

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

LLP packages.

KingborTechnologyCo.,Ltd

TEL:(86)0755-83095458 FAX:(86)0755-88364052

KB4863

1/19

Rev: 1.1

2005-12-05