lm4867 National Semiconductor Corporation, lm4867 Datasheet

lm4867

Manufacturer Part Number

lm4867

Description

Output-transient-free Dual 2.1w Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM4867.pdf (28 pages)

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Download datasheet (852Kb)

LM4867

Output-Transient-Free Dual 2.1W Audio Amplifier Plus

No Coupling Capacitor Stereo Headphone Function

General Description

The LM4867 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. The LM4867 uses advanced, latest gen-

eration circuitry to eliminate all traces of clicks and pops

when the supply voltage is first applied. The amplifier has a

headphone-amplifier-select input pin. It is used to switch the

amplifiers from bridge to single-ended mode for driving

headphones. A new circuit topology eliminates headphone

output coupling capacitors (patent pending). A MUX control

pin allows selection between the two sets of stereo input

signals. The MUX control can also be used to select be-

tween two different customer-specified closed-loop re-

sponses.

Boomer audio power amplifiers are designed specifically to

provide high quality output power from a surface mount

package and require few external components. To simplify

audio system design, the LM4867 combines dual bridge

speaker amplifiers and stereo headphone amplifiers in one

package.

The LM4867 features an externally controlled power-saving

micropower shutdown mode, a stereo headphone amplifier

mode, and thermal shutdown protection.

Note 1: An LM4867LQ or LM4867MTE that has been properly mounted to

a circuit board will deliver 2.1W into 4Ω. The Mux control can also be used to

select two different closed-loop responses. LM4867MT will deliver 1.1W into

8Ω. See the Application Information sections for further information concern-

ing the LM4867LQ and the LM4867MT.

Note 2: An LM4867LQ or LM4867MTE that has been properly mounted to a

circuit board and forced-air cooled will deliver 2.4W into 3Ω.

Connection Diagrams

Boomer

is a registered trademark of National Semiconductor Corporation.

See NS Package Number MXA20A for Exposed-DAP TSSOP

See NS Package Number MTC20 for TSSOP

DS200013

Order Number LM4867MT, LM4867MTE

Top View

Key Specifications

n P

n Single-ended mode - THD+N at 75mW into 32Ω

n Shutdown current

Features

n Advanced “click and pop” suppression circuitry

n Eliminates headphone amplifier output coupling

n Stereo headphone amplifier mode

n Input mux control and two separate inputs per channel

n Thermal shutdown protection circuitry

n LLP, TSSOP, and exposed-DAP TSSOP packaging

Applications

n Multimedia monitors

n Portable and desktop computers

n Portable audio systems

(max)

capacitors (patent pending)

available

LM4867LQ, 3Ω load

LM4867LQ, 4Ω load

LM4867MTE, 4Ω

LM4867MT, 8Ω

at 1% THD+N

20001358

www.national.com

August 2002

0.7µA (typ)

2.4W (typ)

2.1W (typ)

1.9W (typ)

1.1W (typ)

0.5%

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