lm4682 National Semiconductor Corporation, lm4682 Datasheet

lm4682

Manufacturer Part Number

lm4682

Description

10 Watt Stereo Class D Audio Power Amplifier With Stereo Headphone Amplifier And Dc Volume Control

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM4682.pdf (21 pages)

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LM4682

10 Watt Stereo CLASS D Audio Power Amplifier with

Stereo Headphone Amplifier and DC Volume Control

General Description

The LM4682 is a fully integrated single supply, high effi-

ciency audio power amplifier solution. The LM4682 utilizes a

proprietary balanced pulse-width modulation technique that

lowers output noise and THD and improves PSRR when

compared to conventional pulse width modulators.

The LM4682 also features a stereo headphone amplifier that

delivers 60mW into a 32Ω headset with less than 0.5% THD.

The LM4682’s DC volume control has a +30dB to –48dB

range when speakers are driven and a range of +13dB to

–65dB when headphones are connected. All amplifiers are

protected by thermal shutdown. Additionally, all amplifiers

incorporate output current limiting function to protect their

outputs from short circuit.

The LM4682 features a low-power consumption shutdown

mode. And its efficiency reaches 85% for a 10W output

power with an 8Ω load. External heatsink is not required

when playing music. The IC features click and pop reduction

circuitry that minimizes audible popping during device

turn-on and turn-off. The LM4682 is available in a 48-lead

LLP package, ideal for portable and desktop computer ap-

plications.

Boomer

is a registered trademark of National Semiconductor Corporation.

DS201196

Key Specifications

n P

n THD+N at 1kHz at 6W into 8Ω (Power Amp) 0.2% (typ)

n Efficiency at 7W into 8Ω

n Total quiescent power supply current

n Total shutdown power supply current

n THD+N 1kHz, 20mW, 32Ω (Headphone)

n Single supply range

Features

n Pulse-width modulator.

n DC Volume Control

n Stereo headphone amplifier.

n “Click and pop” suppression circuitry.

n Micropower shutdown mode.

n 48 lead LLP package (No heatsink required).

Applications

n Flat Panel Displays

n Televisions

n Multimedia Monitors

at THD+N = 10%, V

= 14V

www.national.com

8.5V to 15V

0.1mA (typ)

0.02% (typ)

52mA (typ)

June 2006

10W (typ)

84% (typ)

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