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LM4670ITL

更新时间： 2024-11-22 22:07:39
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 1077K
描述
Filterless High Efficiency 3W Switching Audio Amplifier

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中文翻译

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LM4670ITL 技术参数

是否Rohs认证： 不符合生命周期：Transferred
包装说明：MICRO, SMD-9Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.33.00.01
风险等级：5.05标称带宽：20 kHz
商用集成电路类型：AUDIO AMPLIFIER谐波失真：10%
JESD-30 代码：S-PBGA-B9JESD-609代码：e0
长度：1.463 mm湿度敏感等级：1
信道数量：1功能数量：1
端子数量：9最高工作温度：85 °C
最低工作温度：-40 °C标称输出功率：3 W
封装主体材料：PLASTIC/EPOXY封装代码：VFBGA
封装等效代码：BGA9,3X3,20封装形状：SQUARE
封装形式：GRID ARRAY, VERY THIN PROFILE, FINE PITCH峰值回流温度（摄氏度）：260
电源：3/5 V认证状态：Not Qualified
座面最大高度：0.675 mm子类别：Audio/Video Amplifiers
最大压摆率：10 mA最大供电电压 (Vsup)：5.5 V
最小供电电压 (Vsup)：2.4 V表面贴装：YES
温度等级：INDUSTRIAL端子面层：Tin/Lead (Sn63Pb37)
端子形式：BALL端子节距：0.5 mm
端子位置：BOTTOM处于峰值回流温度下的最长时间：40
宽度：1.463 mmBase Number Matches：1

LM4670ITL 数据手册

 浏览型号LM4670ITL的Datasheet PDF文件第2页浏览型号LM4670ITL的Datasheet PDF文件第3页浏览型号LM4670ITL的Datasheet PDF文件第4页浏览型号LM4670ITL的Datasheet PDF文件第5页浏览型号LM4670ITL的Datasheet PDF文件第6页浏览型号LM4670ITL的Datasheet PDF文件第7页 
December 2004  
LM4670  
Filterless High Efficiency 3W Switching Audio Amplifier  
General Description  
Key Specifications  
The LM4670 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 external com-  
ponent count, simplifies circuit design, and reduces board  
area. The LM4670 processes analog inputs with a delta-  
sigma modulation technique that lowers output noise and  
THD when compared to conventional pulse width modula-  
tors.  
j
Efficiency at 3.6V, 100mW into 8Ω speaker 77% (typ)  
j
Efficiency at 3.6V, 600mW into 8Ω speaker 88% (typ)  
j
Efficiency at 5V, 1W into 8Ω speaker  
Quiescent current, 3.6V supply  
Total shutdown power supply current  
Single supply range  
87% (typ)  
4.8mA (typ)  
0.01µA (typ)  
2.4V to 5.5V  
j
j
j
The LM4670 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 2.3W with  
less than 1% THD+N. Its flexible power supply requirements  
allow operation from 2.4V to 5.5V.  
Features  
n No output filter required for inductive loads  
n Externally configurable gain  
n Very fast turn on time: 1.35ms (typ)  
n Minimum external components  
n "Click and pop" suppression circuitry  
n Micro-power shutdown mode  
n Short circuit protection  
The LM4670 has high efficiency with speaker loads com-  
pared to a typical Class AB amplifier. With a 3.6V supply  
driving an 8Ω speaker, the IC’s efficiency for a 100mW  
power level is 77%, reaching 88% at 600mW output power.  
n Available in space-saving microSMD and LLP packages  
The LM4670 features a low-power consumption shutdown  
mode. Shutdown may be enabled by driving the Shutdown  
pin to a logic low (GND).  
Applications  
n Mobile phones  
n PDAs  
The gain of the LM4670 is externally configurable which  
allows independent gain control from multiple sources by  
summing the signals.  
n Portable electronic devices  
Typical Application  
20089901  
FIGURE 1. Typical Audio Amplifier Application Circuit  
Boomer® is a registered trademark of National Semiconductor Corporation.  
© 2004 National Semiconductor Corporation  
DS200899  
www.national.com  
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