lm4835lq National Semiconductor Corporation, lm4835lq Datasheet

lm4835lq

Manufacturer Part Number

lm4835lq

Description

Stereo 2w Audio Power Amplifiers With Dc Volume Control And Selectable Gain

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM4835LQ.pdf (28 pages)

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LM4835

Stereo 2W Audio Power Amplifiers

with DC Volume Control and Selectable Gain

General Description

The LM4835 is a monolithic integrated circuit that provides

DC volume control, and stereo bridged audio power amplifi-

ers capable of producing 2W into 4Ω (Note 1) with less than

1.0% THD or 2.2W into 3Ω (Note 2) with less than 1.0%

THD.

Boomer

to provide high quality audio while requiring a minimum

amount of external components. The LM4835 incorporates a

DC volume control, stereo bridged audio power amplifiers

and a selectable gain or bass boost, making it optimally

suited for multimedia monitors, portable radios, desktop, and

portable computer applications.

The LM4835 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 LM4835LQ and

LM4835MTE will deliver 2W into 4Ω. The LM4835MT will deliver 1.1W into

8Ω. See the Application Information section LM4835LQ and for LM4835MTE

usage information.

Note 2: An LM4835LQ and LM4835MTE that have been properly mounted

to the circuit board and forced-air cooled will deliver 2.2W into 3Ω.

Connection Diagrams

Boomer

See NS Package LQA028AA for Exposed-DAP LLP

is a registered trademark of NationalSemiconductor Corporation.

audio integrated circuits were designed specifically

Order Number LM4835LQ

LLP Package

Top View

DS100139

10013935

Key Specifications

n P

n Single-ended mode - THD+N at 85mW into 32Ω

n Shutdown current

Features

n PC98 Compliant

n DC Volume Control Interface

n System Beep Detect

n Stereo switchable bridged/single-ended power amplifiers

n Selectable internal/external gain and bass boost

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

or See NS Package MXA28A for Exposed-DAP TSSOP

(typ)

configurable

into 3Ω (LM4835LQ, LM4835MTE)

into 4Ω (LM4835LQ, LM4835MTE)

into 8Ω (LM4835)

at 1% THD+N

Order Number LM4835MT or LM4835MTE

See NS Package MTC28 for TSSOP

TSSOP Package

Top View

10013902

February 2003

www.national.com

0.7µA (typ)

2.2W (typ)

2.0W (typ)

1.1W (typ)

1.0%

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