LM4849

Stereo 2W Audio Power Amplifiers

with DC Volume Control and Input Mux

General Description

The LM4849 is a monolithic integrated circuit that provides

DC volume control, and stereo bridged audio power amplifi-

ers capable of producing 2W into 4

Ω (Note 1) with less than

1.0% THD+N, or 2.2W into 3

Ω (Note 2) with less than 1.0%

THD+N.

to provide high quality audio while requiring a minimum

amount of external components. The LM4849 incorporates a

DC volume control, stereo bridged audio power amplifiers,

and an input mux making it optimally suited for multimedia

monitors, portable radios, desktop, and portable computer

applications.

The LM4849 features an externally controlled, low-power

consumption shutdown mode, and both a power amplifier

and headphone mute for maximum system flexibility and

performance.

Note 1: When properly mounted to the circuit board, the LM4849MH will

deliver 2W into 4

Ω. See the Application Information section for LM4849MH

usage information.

Note 2: An LM4849MH that has been properly mounted to the circuit board

and forced-air cooled will deliver 2.2W into 3

Ω.

Key Specifications

into 3

Ω (Note2)

2.2W (typ)

into 4

Ω (Note1)

2.0W (typ)

into 8

Ω

1.1W (typ)

into 32

Ω

1.0% (typ)

0.2µA (typ)

Features

n

DC Volume Control Interface

n

Input mux

n

Stereo switchable bridged/single-ended power amplifiers

n

“Click and pop” suppression circuitry

n

Thermal shutdown protection circuitry

Applications

n

Portable and Desktop Computers

n

Multimedia, LCD Monitors/TV

n

Portable Radios, PDAs, and Portable TVs

Connection Diagram

TSSOP Package

20076702

Top View

Order Number LM4849MH

See NS Package Number MXA28A for Exposed-DAP TSSOP

August 2003

© 2003 National Semiconductor Corporation

DS200767

www.national.com