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LM4850MM Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM4850MM
Descripción Electrónicos  Mono 1.5 W / Stereo 300 mW Power Amplifier
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4850MM Datasheet(HTML) 1 Page - National Semiconductor (TI)

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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
bridged-tied load (BTL) with 1% THD+N or 95mW per chan-
nel
of
continuous
average
power
into
stereo
32
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’s 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
Ω (at 1% THD+N). The other package options for the
LM4850 will deliver 1.1W into 8
Ω (at 1% THD+N). See Application Infor-
mation sections for further information concerning the LM4850LD,
LM4850MM, and LM4850MT.
Key Specifications
n
Output Power at 1% THD+N, 1kHz:
n
LM4850LD 3
Ω BTL
1.9W (typ)
n
LM4850LD 4
Ω BTL
1.7W (typ)
n
LM4850MM, MT 4
Ω BTL
1.5W (typ)
n
LM4850LD, MM, MT 8
Ω BTL
1.1W (typ)
n
LM4850LD, MM, MT 8
Ω SE
300mW (typ)
n
LM4850LD, MM, MT 32
Ω SE
95mW (typ)
n
THD+N at 1kHz, 95mW into 32
Ω SE
1% (typ)
n
Single Supply Operation
2.4 to 5.5V
n
Shutdown Current
44µA (typ)
Features
n
Mono 1.5W BTL or stereo 300mW output
n
Headphone sense
n
“Click and pop” suppression circuitry
n
No bootstrap capacitors required
n
Thermal shutdown protection
n
Unity-gain stable
n
LLP, TSSOP, and MSOP packaging
Applications
n
Portable computers
n
Desktop computers
n
PDA’s
n
Handheld games
Typical Application
Boomer® is a registered trademark of National Semiconductor Corporation.
20001031
FIGURE 1. Typical Audio Amplifier Application Circuit
July 2002
© 2002 National Semiconductor Corporation
DS200010
www.national.com


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