LM4873MTEX National Semiconductor, LM4873MTEX Datasheet

LM4873MTEX

Manufacturer Part Number

LM4873MTEX

Description

IC,Audio Amplifier,DUAL,TSSOP,20PIN,PLASTIC

Manufacturer

National Semiconductor

Datasheet

1.LM4873MTEX.pdf (25 pages)

Specifications of LM4873MTEX

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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LM4873

Dual 2.1W Audio Amplifier Plus Stereo Headphone

Function

General Description

The LM4873 is a dual bridge-connected audio power ampli-

fier which, when connected to a 5V supply, will deliver 2.1W

to a 4Ω load (Note 1) or 2.4W 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. A MUX control pin allows selec-

tion between the two stereo sets of amplifier inputs. The

MUX control can also be used to select two different

closed-loop responses.

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 LM4873 combines dual bridge

speaker amplifiers and stereo headphone amplifiers on one

chip.

The LM4873 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:

properly mounted to a circuit board will deliver 2.1W into 4Ω. The other

package options for the LM4873 will deliver 1.1W into 8Ω. See the Applica-

tion

LM4873MTE-1, LM4873MTE, and the LM4873LQ.

Note 2: An LM4873MTE-1, LM4873MTE, or LM4873LQ that has been prop-

erly mounted to a circuit board and forced-air cooled will deliver 2.4W into 3Ω.

Connection Diagrams

Boomer

See NS Package Number MXA28A for Exposed-DAP

Information

is a registered trademark of National Semiconductor Corporation.

An LM4873MTE-1, LM4873MTE, or LM4873LQ that has been

Order Number LM4873MTE-1

sections

for

Top View

TSSOP

further

information

DS100993

10099330

concerning

the

Key Specifications

Features

n Input mux control and two separate inputs per channel

n Stereo headphone amplifier mode

n “Click and pop” suppression circuitry

n Thermal shutdown protection circuitry

n PCB area-saving micro SMD and thin micro SMD

n TSSOP and exposed-DAP TSSOP and LLP packages

Applications

n Multimedia monitors

n Portable and desktop computers

n Portable audio systems

See NS Package Number MXA20A for Exposed-DAP

packages

at 75mW into 32Ω

Shutdown current

Supply voltage range

Single-ended mode THD+N

LM4873LQ, 3Ω, 4Ω loads

LM4873MTE-1, 3Ω, 4Ω loads 2.4W(typ), 2.1W(typ)

LM4873IBL, 8Ω load

LM4873MTE, 4Ω

LM4873, 8Ω

See NS Package Number MTC20 for TSSOP

at 1% THD+N

Order Number LM4873MT, LM4873MTE

Top View

TSSOP

2.4W(typ), 2.1W(typ)

10099302

October 2002

www.national.com

0.5%(max)

2V to 5.5V

0.7µA(typ)

1.1W(typ)

1.9W(typ)

1.1W(typ)

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