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LM4665ITLX/NOPB PDF预览

LM4665ITLX/NOPB

更新时间： 2024-11-23 13:09:23
品牌 Logo 应用领域
美国国家半导体 - NSC 音频放大器
页数 文件大小 规格书
18页 1014K
描述
IC,AUDIO AMPLIFIER,SINGLE,BGA,9PIN,PLASTIC

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中文翻译

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LM4665ITLX/NOPB 技术参数

是否Rohs认证： 符合生命周期：Obsolete
包装说明：FBGA, BGA9,3X3,20Reach Compliance Code：compliant
风险等级：5.84商用集成电路类型：AUDIO AMPLIFIER
JESD-30 代码：S-PBGA-B9JESD-609代码：e1
湿度敏感等级：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封装主体材料：PLASTIC/EPOXY
封装代码：FBGA封装等效代码：BGA9,3X3,20
封装形状：SQUARE封装形式：GRID ARRAY, FINE PITCH
电源：3/5 V认证状态：Not Qualified
子类别：Audio/Video Amplifiers表面贴装：YES
温度等级：INDUSTRIAL端子面层：Tin/Silver/Copper (Sn/Ag/Cu)
端子形式：BALL端子节距：0.5 mm
端子位置：BOTTOMBase Number Matches：1

LM4665ITLX/NOPB 数据手册

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December 2002  
LM4665  
Filterless High Efficiency 1W Switching Audio Amplifier  
General Description  
Key Specifications  
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 modu-  
lation technique that lowers output noise and THD when  
compared to conventional pulse width modulators.  
j
Efficiency at 100mW into 8Ω transducer  
75%(typ)  
80%(typ)  
3mA(typ)  
j
Efficiency at 400mW into 8Ω transducer  
j
j
j
j
Total quiescent power supply current (3V)  
Total shutdown power supply current (3V) 0.01µA(typ)  
Single supply range (MSOP & LD)  
Single supply range (ITL) (Note 11)  
2.7V to 5.5V  
2.7V to 3.8V  
The LM4665 is designed to meet the demands of mobile  
phones and other portable communication devices. Operat-  
ing on a single 3V supply, it is capable of driving 8Ω trans-  
ducer loads at a continuous average output of 400mW with  
less than 2%THD+N.  
Features  
n No output filter required for inductive transducers  
n Selectable gain of 6dB (2V/V) or 12dB (4V/V)  
n Very fast turn on time: 5ms (typ)  
n User selectable shutdown High or Low logic level  
n Minimum external components  
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.  
n "Click and pop" suppression circuitry  
n Micro-power shutdown mode  
n Short circuit protection  
n micro SMD, LLP, and MSOP packages (no heat sink  
required)  
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 Shut-  
down Mode pin to either VDD (high) or GND (low) enables  
the Shutdown pin to be driven in a likewise manner to  
activate shutdown.  
Applications  
n Mobile phones  
n PDAs  
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.  
n Portable electronic devices  
Typical Application  
20027001  
FIGURE 1. Typical Audio Amplifier Application Circuit  
Boomer® is a registered trademark of National Semiconductor Corporation.  
© 2002 National Semiconductor Corporation  
DS200270  
www.national.com  
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