LM4809, LM4809LQBD

www.ti.com

SNAS126E – MAY 2004 – REVISED MAY 2004

LM4809

Dual 105mW Headphone Amplifier with Active-

Low Shutdown Mode

Check for Samples: LM4809, LM4809LQBD

1

FEATURES

APPLICATIONS

2

•

Active-low shutdown mode

•

Headphone Amplifier

•

"Click and Pop" reduction circuitry

•

Personal Computers

•

Low shutdown current

•

Microphone Preamplifier

•

LLP, MSOP, and SO surface mount packaging

•

PDA's

•

No bootstrap capacitors required

•

Unity-gain stable

DESCRIPTION

The LM4809 is a dual audio power amplifier capable of delivering 105mW per channel of continuous average

power into a 16

Ω load with 0.1% (THD+N) from a 5V power supply.

Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal

amount of external components. Since the LM4809 does not require bootstrap capacitors or snubber networks, it

is optimally suited for low-power portable systems.

The unity-gain stable LM4809 can be configured by external gain-setting resistors.

The LM4809 features an externally controlled, active-low, micropower consumption shutdown mode, as well as

an internal thermal shutdown protection mechanism.

Table 1. Key Specifications

VALUE

UNIT

THD+N at 1kHz at 105mW continuous average power into 16

Ω

0.1% (typ)

THD+N at 1kHz at 70mW continuous average power into 32

Ω

0.1% (typ)

Shutdown Current

0.4µA (typ)

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.