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参数资料
| 型号： | LM4665LD/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO10 |
| 封装： | LLP-10 |
| 文件页数： | 1/18页 |
| 文件大小： | 1018K |
| 代理商： | LM4665LD/NOPB |
LM4665
Filterless High Efficiency 1W Switching Audio Amplifier
General 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 modu-
lation technique that lowers output noise and THD when
compared to conventional pulse width modulators.
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 8
trans-
ducer loads at a continuous average output of 400mW with
less than 2%THD+N.
The LM4665 has high efficiency with an 8
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.
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 V
DD (high) or GND (low) enables
the Shutdown pin to be driven in a likewise manner to
activate shutdown.
The LM4665 has fixed selectable gain of either 6dB or 12dB.
The LM4665 has short circuit protection against a short from
the outputs to V
DD, GND or across the outputs.
Key Specifications
j Efficiency at 100mW into 8
transducer
75%(typ)
j Efficiency at 400mW into 8
transducer
80%(typ)
j Total quiescent power supply current (3V)
3mA(typ)
j Total shutdown power supply current (3V) 0.01A(typ)
j Single supply range (MSOP & LD)
2.7V to 5.5V
j Single supply range (ITL) (Note 11)
2.7V to 3.8V
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
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)
Applications
n
Mobile phones
n
PDAs
n
Portable electronic devices
Typical Application
Boomer is a registered trademark of National Semiconductor Corporation.
20027001
FIGURE 1. Typical Audio Amplifier Application Circuit
December 2002
LM4665
Filterless
High
Efficiency
1W
Switching
Audio
Amplifier
2002 National Semiconductor Corporation
DS200270
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4665LDX | 制造商:ROCHESTER 制造商全称:ROCHESTER 功能描述:NATIONALa??S AUDIO AMPLIFIER now featuring RoHS compliancy Audio Amplifier |
| LM4665LDX-G | 制造商:Rochester Electronics LLC 功能描述: |
| LM4665MM | 制造商:Texas Instruments 功能描述:AMP AUDIO 1W SWITCH SMD MSOP10 |
| LM4665MM/NOPB | 功能描述:IC AMP AUDIO 1.4W MONO AB 10MSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) |
| LM4665MMX | 制造商:ROCHESTER 制造商全称:ROCHESTER 功能描述:NATIONALa??S AUDIO AMPLIFIER now featuring RoHS compliancy Audio Amplifier |
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