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LM4809

National Semiconductor
Part Number LM4809
Manufacturer National Semiconductor
Description Dual 105mW Headphone Amplifier
Published Mar 22, 2005
Detailed Description LM4809 Dual 105mW Headphone Amplifier with Active-Low Shutdown Mode November 2002 LM4809 Dual 105mW Headphone Amplifie...
Datasheet PDF File LM4809 PDF File

LM4809
LM4809

Overview
LM4809 Dual 105mW Headphone Amplifier with Active-Low Shutdown Mode November 2002 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.
Key Specifications n THD+N at 1kHz at 105mW continuous average power into 16Ω 0.
1% (typ) n THD+N at 1kHz at 70mW continuous average power into 32Ω 0.
1% (typ) n Shutdown Current 0.
4µA (typ) Features n n n n n n Active-low shutdown mode "Click and Pop" reduction circuitry Low shutdown current LLP, MSOP, and SO surface mount packaging No bootstrap capacitors required Unity-gain stable Applications n n n n Headphone Amplifier Personal Computers Microphone Preamplifier PDA’s Typical Application 20009001 *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.
© 2002 National Semiconductor Corporation DS200090 www.
national.
com LM4809 Connection Diagrams MSOP Package MSOP Marking 20009066 20009002 Top View Order Number LM4809MM See NS Package Number MUA08A SO Package SO Marking 20009067 20009002 Top View Order Number LM4809MA See NS Package Number M08A LLP Package LLP Marking 20009068 20009061 Top View Order Number...


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