LM4809LD

Manufacturer Part NumberLM4809LD
DescriptionLM4809 Dual 105mW Headphone Amplifier with Active-Low Shutdown Mode
ManufacturerNational Semiconductor
LM4809LD datasheet
 


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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.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation
Key Specifications
n THD+N at 1kHz at 105mW continuous average power
into 16Ω
n THD+N at 1kHz at 70mW continuous average power
into 32Ω
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
DS200090
April 2004
0.1% (typ)
0.1% (typ)
0.4µA (typ)
20009001
www.national.com

LM4809LD Summary of contents