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LM4671_08

更新时间： 2024-11-26 04:20:07
品牌 Logo 应用领域
美国国家半导体 - NSC 开关音频放大器
页数 文件大小 规格书
18页 587K
描述
Filterless High Efficiency 2.5W Switching Audio Amplifier

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March 3, 2008  
LM4671ꢀ  
Filterless High Efficiency 2.5W Switching Audio Amplifier  
General Description  
Key Specifications  
The LM4671 is a single supply, high efficiency 2.5W switching  
audio amplifier. A low noise, filterless PWM architecture elim-  
inates the output filter, reducing external component count,  
board area consumption, system cost, and simplifying design.  
■ꢀEfficiency @ 3.6V, 100mW into  
ꢁꢁ8Ω speaker  
80% (typ)  
88% (typ)  
■ꢀEfficiency @ 3.6V, 400mW into  
ꢁꢁ 8Ω speaker  
The LM4671 is designed to meet the demands of mobile  
phones and other portable communication devices. Operat-  
ing on a single 5V supply, it is capable of driving a 4Ω speaker  
load at a continuous average output of 2.1W with less than  
1% THD+N. Its flexible power supply requirements allow op-  
eration from 2.4V to 5.5V.  
■ꢀEfficiency @ 5V, 1W into 8Ω  
speaker  
86% (typ)  
■ꢀQuiescent current, 3.6V supply  
2.8mA (typ)  
■ꢀTotal shutdown power supply  
0.01µA (typ)  
2.4V to 5.5V  
The LM4671 has high efficiency with speaker loads compared  
to a typical Class AB amplifier. With a 3V supply driving an  
8Ω speaker, the IC's efficiency for a 100mW power level is  
80%, reaching 88% at 400mW output power.  
current  
■ꢀSingle supply range  
Features  
The LM4671 features a low-power consumption shutdown  
mode. Shutdown may be enabled by driving the Shutdown  
pin to a logic low (GND).  
No output filter required for inductive loads  
■
■
Externally configurable gain  
The gain of the LM4671 is externally configurable which al-  
lows independent gain control from multiple sources by sum-  
ming the signals.  
Very fast turn on time: 17μs (typ)  
Minimum external components  
"Click and pop" suppression circuitry  
Micro-power shutdown mode  
■
■
■
■
■
Available in space-saving microSMD package  
Applications  
Mobile phones  
■
■
■
PDAs  
Portable electronic devices  
Typical Application  
201073j3  
FIGURE 1. Typical Audio Amplifier Application Circuit  
Boomer® is a registered trademark of National Semiconductor Corporation.  
© 2008 National Semiconductor Corporation  
201073  
www.national.com  
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