LM4838MT National Semiconductor, LM4838MT Datasheet

LM4838MT

Manufacturer Part Number

LM4838MT

Description

Manufacturer

National Semiconductor

Datasheets

1.LM4838MTX.pdf (38 pages)

2.LM4838MTE.pdf (36 pages)

3.LM4838MTE.pdf (36 pages)

Specifications of LM4838MT

Case

SSOP-28

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LM4838

Stereo 2W Audio Power Amplifiers

with DC Volume Control and Selectable Gain

General Description

The LM4838 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 LM4838 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 LM4838 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 LM4838LQ and

LM4838MTE will deliver 2W into 4Ω. The LM4838MT and LM4838ITL will

deliver 1.1W into 8Ω. See Application Information section Exposed-DAP

package PCB Mounting Considerations for more information.

Note 2: An LM4838LQ and LM4838MTE that have been properly mounted

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

Block Diagram

Boomer

is a registered trademark of NationalSemiconductor Corporation.

audio integrated circuits were designed specifically

DS200133

FIGURE 1. LM4838 Block Diagram

Key Specifications

n P

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

n Shutdown current

Features

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

32Ω

into 3Ω (LQ & MTE)

into 4Ω (LQ & MTE)

into 8Ω (MT, MTE, ITL, & LQ)

at 1% THD+N

20013301

January 2003

www.national.com

0.7µA (typ)

2.2W (typ)

2.0W (typ)

1.1W (typ)

1.0%(typ)

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