LM4853

Mono 1.5 W / Stereo 300mW Power Amplifier

General Description

The LM4853 is an audio power amplifier capable of deliver-

ing 1.5W (typ) of continuous average power into a mono 4

Ω

bridged-tied load (BTL) with 1% THD+N or 95mW per chan-

nel of continuous average power into stereo 32

Ω single-

ended (SE) loads with 1% THD+N, using a 5V power supply.

The LM4853 can automatically switch between mono BTL

and stereo SE modes utilizing a headphone sense pin. It is

ideal for any system that provides both a monaural speaker

output and a stereo line or headphone output

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. Since the LM4853 does not require

bootstrap capacitors or snubber networks, it is optimally

suited for low-power portable systems.

The LM4853 features an externally controlled, micropower

consumption shutdown mode and thermal shutdown protec-

tion. The unity-gain stable LM4853’s gain is set by external

gain-setting resistors

Key Specifications

n

Output Power at 1% THD+N, 1kHz:

n

LM4853LD 3

Ω BTL

1.9W (typ)

n

LM4853LD 4

Ω BTL

1.7W (typ)

n

LM4853MM 4

Ω BTL

1.5W (typ)

n

LM4853MM,LD 8

Ω BTL

1.1W (typ)

n

LM4853MM,LD 8

Ω SE

300mW (typ)

n

LM4853MM,LD 32

Ω SE

95mW (typ)

n

THD+N at 1kHz, 95mW into 32

Ω SE

1% (typ)

n

Single Supply Operation

2.4 to 5.5V

n

Shutdown Current

18µA (typ)

Features

n

Mono 1.5W BTL or stereo 300mW output

n

Headphone sense

n

“Click and pop” suppression circuitry

n

No bootstrap capacitors required

n

Thermal shutdown protection

n

Unity-gain stable

n

Available in space-saving MSOP and LLP packaging

Applications

n

Portable computers

n

Desktop computers

n

PDA’s

n

Handheld games

Connection Diagrams

20033429

Top View

10 Lead MSOP

Order Number LM4853MM

See NS Package Number MUB10A

20033428

Top View

14 Lead LLP

Order Number LM4853LD

See NS Package Number LDA14A

January 2003

© 2003 National Semiconductor Corporation

DS200334

www.national.com