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LM4665

更新时间： 2024-11-27 11:11:55
品牌 Logo 应用领域
德州仪器 - TI 放大器音频放大器
页数 文件大小 规格书
28页 1810K
描述
具有可选增益的 1.4W 单声道、模拟输入 D 类音频放大器

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LM4665 数据手册

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LM4665  
www.ti.com  
SNAS146E –FEBRUARY 2002–REVISED MAY 2013  
LM4665  
Filterless High Efficiency 1W Switching Audio  
Amplifier  
Check for Samples: LM4665  
1
FEATURES  
DESCRIPTION  
The LM4665 is a fully integrated single-supply high  
efficiency switching audio amplifier. It features an  
innovative modulator that eliminates the LC output  
filter used with typical switching amplifiers.  
Eliminating the output filter reduces parts count,  
simplifies circuit design, and reduces board area. The  
LM4665 processes analog inputs with a delta-sigma  
modulation technique that lowers output noise and  
THD when compared to conventional pulse width  
modulators.  
2
•
No Output Filter Required for Inductive  
Transducers  
•
•
•
Selectable Gain of 6dB (2V/V) or 12dB (4V/V)  
Very Fast Turn On Time: 5ms (typ)  
User Selectable Shutdown High or Low Logic  
Level  
•
•
•
•
•
Minimum External Components  
"Click and Pop" Suppression Circuitry  
Micro-Power Shutdown Mode  
Short Circuit Protection  
The LM4665 is designed to meet the demands of  
mobile phones and other portable communication  
devices. Operating on a single 3V supply, it is  
DSBGA, WSON, and VSSOP Packages (No  
Heat Sink Required)  
capable of driving 8Ω transducer loads at  
a
continuous average output of 400mW with less than  
2%THD+N.  
APPLICATIONS  
The LM4665 has high efficiency with an 8Ω  
transducer load compared to a typical Class AB  
amplifier. With a 3V supply, the IC's efficiency for a  
100mW power level is 75%, reaching 80% at 400mW  
output power.  
•
•
•
Mobile Phones  
PDAs  
Portable Electronic Devices  
KEY SPECIFICATIONS  
The LM4665 features a low-power consumption  
shutdown mode. Shutdown may be enabled by either  
a logic high or low depending on the mode selection.  
Connecting the Shutdown Mode pin to either VDD  
(high) or GND (low) enables the Shutdown pin to be  
driven in a likewise manner to activate shutdown.  
•
•
•
•
•
•
Efficiency at 100mW into 8Ω Transducer  
75%(typ)  
Efficiency at 400mW into 8Ω Transducer  
80%(typ)  
Total Quiescent Power Supply Current (3V)  
3mA(typ)  
The LM4665 has fixed selectable gain of either 6dB  
or 12dB. The LM4665 has short circuit protection  
against a short from the outputs to VDD, GND or  
across the outputs.  
Total Shutdown Power Supply Current (3V)  
0.01µA(typ)  
Single Supply Range (VSSOP & WSON) 2.7V to  
5.5V  
Single Supply Range (DSBGA) (Note 11) 2.7V  
to 3.8V  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
All trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2002–2013, Texas Instruments Incorporated  
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