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LM4850LD Datasheet

  • LM4850LD

  • National Semiconductor [Mono 1.5 W / Stereo 300 mW Power Am...

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  • NSC

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LM4850 Mono 1.5 W / Stereo 300 mW Power Amplifier
July 2002
LM4850
Mono 1.5 W / Stereo 300 mW Power Amplifier
General Description
The LM4850 is an audio power amplifier capable of deliver-
ing 1.5W (typ) of continuous average power into a mono 4鈩?/div>
bridged-tied load (BTL) with 1% THD+N or 95mW per chan-
nel of continuous average power into stereo 32鈩?/div>
single-ended (SE) loads with 1% THD+N, using a 5V power
supply.
The LM4850 can automatically switch between mono BTL
and stereo SE modes utilizing a headphone sense pin. It is
ideal for any system that provides both a monaural speaker
output and a stereo line or headphone output
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4850 does not require
bootstrap capacitors or snubber networks, it is optimally
suited for low-power portable systems.
The LM4850 features an externally controlled, micropower
consumption shutdown mode and thermal shutdown protec-
tion. The unity-gain stable LM4850鈥檚 gain is set by external
gain-setting resistors
Note 1:
An LM4850LD that has been properly mounted to a circuit board will
deliver 1.9W into 3鈩?(at 1% THD+N). The other package options for the
LM4850 will deliver 1.1W into 8鈩?(at 1% THD+N). See
Application Infor-
mation
sections for further information concerning the LM4850LD,
LM4850MM, and LM4850MT.
Key Specifications
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Output Power at 1% THD+N, 1kHz:
LM4850LD 3鈩?BTL
LM4850LD 4鈩?BTL
LM4850MM, MT 4鈩?BTL
LM4850LD, MM, MT 8鈩?BTL
LM4850LD, MM, MT 8鈩?SE
LM4850LD, MM, MT 32鈩?SE
THD+N at 1kHz, 95mW into 32鈩?SE
Single Supply Operation
Shutdown Current
1.9W (typ)
1.7W (typ)
1.5W (typ)
1.1W (typ)
300mW (typ)
95mW (typ)
1% (typ)
2.4 to 5.5V
44碌A (typ)
Features
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Mono 1.5W BTL or stereo 300mW output
Headphone sense
鈥淐lick and pop鈥?suppression circuitry
No bootstrap capacitors required
Thermal shutdown protection
Unity-gain stable
LLP, TSSOP, and MSOP packaging
Applications
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Portable computers
Desktop computers
PDA鈥檚
Handheld games
Typical Application
20001031
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
庐
is a registered trademark of National Semiconductor Corporation.
漏 2002 National Semiconductor Corporation
DS200010
www.national.com

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