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LM4858

更新时间： 2024-11-10 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
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17页 680K
描述
Mono 1.5 W / Stereo 300mW Power Amplifier

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LM4858 数据手册

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May 2003  
LM4858  
Mono 1.5 W / Stereo 300mW Power Amplifier  
General Description  
Key Specifications  
n Output Power at 1% THD+N, 1kHz:  
The LM4858 is an audio power amplifier capable of deliver-  
ing 1.5W (typ) of continuous average power into a mono 4Ω  
bridged-tied load (BTL) with 1% THD+N or 95mW per chan-  
nel of continuous average power into stereo 32Ω single-  
ended (SE) loads with 1% THD+N, using a 5V power supply.  
n
n
n
n
n
n
LM4858LD 3Ω BTL  
LM4858LD 4Ω BTL  
LM4858MM 4Ω BTL  
LM4858MM,LD 8Ω BTL  
LM4858MM,LD 8Ω SE  
LM4858MM,LD 32Ω SE  
1.9W (typ)  
1.7W (typ)  
1.5W (typ)  
1.1W (typ)  
300mW (typ)  
95mW (typ)  
1% (typ)  
The LM4858 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  
n THD+N at 1kHz, 95mW into 32Ω SE  
n Single Supply Operation  
n Shutdown Current  
2.4 to 5.5V  
18µA (typ)  
Boomer audio power amplifiers were designed specifically to  
provide high quality output power with a minimal amount of  
external components. Since the LM4858 does not require  
bootstrap capacitors or snubber networks, it is optimally  
suited for low-power portable systems.  
Features  
n Mono 1.5W BTL or stereo 300mW output  
n Logic controlled headphone sense  
n “Click and pop” suppression circuitry  
n No bootstrap capacitors required  
n Thermal shutdown protection  
n Unity-gain stable  
The LM4858 features an externally controlled, micropower  
consumption shutdown mode and thermal shutdown protec-  
tion. The unity-gain stable LM4858’s gain is set by external  
gain-setting resistors  
n Available in space-saving MSOP and LLP packaging  
Applications  
n Portable computers  
n Desktop computers  
n PDA’s  
n Handheld games  
Connection Diagrams  
20064729  
Top View  
10 Lead MSOP  
Order Number LM4858MM  
See NS Package Number MUB10A  
20064728  
Top View  
14 Lead LLP  
Order Number LM4858LD  
See NS Package Number LDA14A  
Boomer® is a registered trademark of National Semiconductor Corporation.  
© 2003 National Semiconductor Corporation  
DS200647  
www.national.com  
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