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LM4663

更新时间： 2024-11-22 22:51:51
品牌 Logo 应用领域
美国国家半导体 - NSC 放大器功率放大器
页数 文件大小 规格书
10页 609K
描述
2 Watt Stereo Class D Audio Power Amplifier with Stereo Headphone Amplifier

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January 2000  
LM4663  
2 Watt Stereo Class D Audio Power Amplifier with Stereo  
Headphone Amplifier  
%
83 (typ)  
n Efficiency at 2 Watt into 4Ω  
General Description  
%
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  
69 (typ)  
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.  
22mA (typ)  
2µA (typ)  
%
0.15 (typ)  
4.5V to 5.5V  
The LM4663 also features a stereo headphone amplifier that  
Features  
%
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.  
n Delta-sigma modulator.  
n Two stereo input selector.  
n “Click and pop” suppression circuitry.  
n Micropower shutdown mode.  
In standby mode, the LM4663 draws an extremely low 2µA  
supply current. With a 4Ω load, the IC’s efficiency for a  
n 24 lead TSSOP package (No heatsink required).  
n Stereo headphone amplifier.  
%
%
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.  
Applications  
n Portable computers  
n Desktop computers  
n Multimedia Monitors  
Key Specifications  
=
%
n PO at THD+N 1  
2.1W (typ)  
n THD+N at 1kHz at 1 Watt into 4Ω (Power  
%
Amp)  
0.2 (typ)  
Block Diagram  
Connection Diagram  
TSSOP Package  
DS101269-2  
Top View  
Order Number LM4663MT  
See NS Package Number MTC24  
(TSSOP Package)  
DS101269-1  
™
BOOMER is a trademark of National Semiconductor Corporation.  
© 2000 National Semiconductor Corporation  
DS101269  
www.national.com  
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