LM4836

Stereo 2W Audio Power Amplifiers

with DC Volume Control, Bass Boost, and Input Mux

General Description

The LM4836 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 LM4836 incorporates a

DC volume control, stereo bridged audio power amplifiers,

selectable gain or bass boost, and an input mux making it

optimally suited for multimedia monitors, portable radios,

desktop, and portable computer applications.

The LM4836 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 LM4836MTE will

deliver 2W into 4

Ω. The LM4836MT will deliver 1.1W into 8Ω. See the Appli-

cation Information section for LM4836MTE usage information.

Note 2: An LM4836MTE which has been properly mounted to the circuit

board and forced-air cooled will deliver 2.2W into 3

Ω.

Key Specifications

into 3

Ω (LM4836MTE)

2.2W(typ)

into 4

Ω (LM4836MTE)

2.0W(typ)

into 8

Ω (LM4836)

1.1W(typ)

n Single-ended mode - THD+N

at 85mW into 32

Ω

1.0%(typ)

n Shutdown current

0.2µA(typ)

Features

n PC98 and PC99 Compliant

n DC Volume Control Interface

n Input mux

n System Beep Detect

n Stereo switchable bridged/single-ended power amplifiers

n Selectable internal/external gain and bass boost

configurable

n “Click and pop” suppression circuitry

n Thermal shutdown protection circuitry

Applications

n Portable and Desktop Computers

n Multimedia Monitors

n Portable Radios, PDAs, and Portable TVs

Connection Diagram

TSSOP Package

DS101088-2

Top View

Order Number LM4836MT

See NS Package Number MTC28 for TSSOP

Order Number LM4836MTE

See NS Package Number MXA28A for Exposed DAP TSSOP

PRELIMINARY

June 1999

© 1999 National Semiconductor Corporation

DS101088

www.national.com