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LM4663 Datasheet

  • LM4663

  • 2 Watt Stereo Class D Audio Power Amplifier with Stereo Head...

  • 10頁

  • NSC

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LM4663 2 Watt Stereo Class D Audio Power Amplifier with Stereo Headphone Amplifier
January 2000
LM4663
2 Watt Stereo Class D Audio Power Amplifier with Stereo
Headphone Amplifier
General Description
The LM4663 is a fully integrated single supply, high effi-
ciency Class D audio power amplifier solution. The LM4663
utilizes a continuous time delta-sigma modulation technique
that lowers output noise and THD when compared to con-
ventional pulse width modulators.
The LM4663 also features a stereo headphone amplifier that
delivers 80mW into a 32鈩?headset with less than 0.5% THD.
The LM4663 has two stereo inputs that can be selected to
drive either the headphone amplifier or the Class D amplifier.
All amplifiers are protected with thermal shutdown.
In standby mode, the LM4663 draws an extremely low 2碌A(chǔ)
supply current. With a 4鈩?load, the IC鈥檚 efficiency for a
250mW power level is 69%, reaching 83% at a power level
of 2W. The IC features click and pop reduction circuitry that
minimizes audible popping during device turn-on and
turn-off. The LM4663 is available in a 24-lead TSSOP pack-
age, ideal for portable and desktop computer applications.
n
n
n
n
n
n
Efficiency at 2 Watt into 4鈩?/div>
Efficiency at 250mW into 4鈩?/div>
Total quiescent power supply current
Total shutdown power supply current
THD+N 1kHz, 20mW, 32鈩?(Headphone)
Single supply range
83% (typ)
69% (typ)
22mA (typ)
2碌A(chǔ) (typ)
0.15% (typ)
4.5V to 5.5V
Features
n
n
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Delta-sigma modulator.
Two stereo input selector.
鈥淐lick and pop鈥?suppression circuitry.
Micropower shutdown mode.
24 lead TSSOP package (No heatsink required).
Stereo headphone amplifier.
Applications
n
Portable computers
n
Desktop computers
n
Multimedia Monitors
Key Specifications
n
P
O
at THD+N = 1%
n
THD+N at 1kHz at 1 Watt into 4鈩?(Power
Amp)
2.1W (typ)
0.2% (typ)
Block Diagram
Connection Diagram
TSSOP Package
DS101269-2
DS101269-1
Top View
Order Number LM4663MT
See NS Package Number MTC24
(TSSOP Package)
BOOMER
鈩?/div>
is a trademark of National Semiconductor Corporation.
漏 2000 National Semiconductor Corporation
DS101269
www.national.com

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