lm4809mmx National Semiconductor Corporation, lm4809mmx Datasheet

lm4809mmx

Manufacturer Part Number

lm4809mmx

Description

Dual 105mw Headphone Amplifier With Active-low Shutdown Mode

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM4809MMX.pdf (21 pages)

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Download datasheet (972Kb)

LM4809

Dual 105mW Headphone Amplifier with Active-Low

Shutdown Mode

General Description

The LM4809 is a dual audio power amplifier capable of

delivering 105mW per channel of continuous average power

into a 16Ω 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.

Typical Application

*Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors.

Boomer

is a registered trademark of National Semiconductor Corporation.

FIGURE 1. Typical Audio Amplifier Application Circuit

DS200090

Key Specifications

n THD+N at 1kHz at 105mW continuous average power

n THD+N at 1kHz at 70mW continuous average power

n Shutdown Current

Features

n Active-low shutdown mode

n "Click and Pop" reduction circuitry

n Low shutdown current

n LLP, MSOP, and SO surface mount packaging

n No bootstrap capacitors required

n Unity-gain stable

Applications

n Headphone Amplifier

n Personal Computers

n Microphone Preamplifier

n PDA’s

into 16Ω

into 32Ω

20009001

www.national.com

0.4µA (typ)

0.1% (typ)

April 2004

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