LM4663 Datasheet, PDF (1/10 Pages) National Semiconductor (TI) – 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 32Ω 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 2µA
supply current. With a 4Ω load, the IC’s 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.
Key Specifications
n P_O at THD+N=1%
n THD+N at 1kHz at 1 Watt into 4Ω (Power
Amp)
2.1W (typ)
0.2% (typ)
n Efficiency at 2 Watt into 4Ω
n Efficiency at 250mW into 4Ω
n Total quiescent power supply current
n Total shutdown power supply current
n THD+N 1kHz, 20mW, 32Ω (Headphone)
n Single supply range
83% (typ)
69% (typ)
22mA (typ)
2µA (typ)
0.15% (typ)
4.5V to 5.5V
Features
n Delta-sigma modulator.
n Two stereo input selector.
n “Click and pop” suppression circuitry.
n Micropower shutdown mode.
n 24 lead TSSOP package (No heatsink required).
n Stereo headphone amplifier.
Applications
n Portable computers
n Desktop computers
n Multimedia Monitors
Block Diagram
Connection Diagram
TSSOP Package
DS101269-1
BOOMER™ is a trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS101269
DS101269-2
Top View
Order Number LM4663MT
See NS Package Number MTC24
(TSSOP Package)
www.national.com