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參數(shù)資料
| 型號： | LM4664ITLX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封裝： | MICRO, SMD-9 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大小： | 550K |
| 代理商： | LM4664ITLX/NOPB |
LM4664
Filterless High Efficiency 1.1W Switching Audio
Amplifier
General Description
The LM4664 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
LM4664 processes analog inputs with a delta-sigma modu-
lation technique that lowers output noise and THD when
compared to conventional pulse width modulators.
The LM4664 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 425mW with
less than 1%THD+N. Its flexible power supply requirements
allow operation from 2.7V to 5.5V.
The LM4664 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 74%, reaching
84% at 425mW output power.
The LM4664 features a low-power consumption shutdown
mode. Shutdown may be enabled by driving the Shutdown
pin to a logic low (GND).
The LM4664 has fixed selectable gain of either 6dB or 12dB.
The LM4664 has short circuit protection against a short from
the outputs to V
DD, GND, or across the outputs.
Key Specifications
j Efficiency at 3V, 100mW into 8
transducer 74% (typ)
j Efficiency at 3V, 425mW into 8
transducer 84% (typ)
j Efficiency at 5V, 1W into 8
transducer
86% (typ)
j Total quiescent power supply current
3.5mA (typ)
j Total shutdown power supply current
0.4A (typ)
j Single supply range
2.7V to 5.5V
Features
n
No output filter required for inductive transducers
n
Selectable gain of 6dB or 12dB
n
Very fast turn on time: 7ms (typ)
n
Minimum external components
n
"Click and pop" suppression circuitry
n
Micro-power shutdown mode
n
Short circuit protection
n
Available in space-saving micro SMD package
Applications
n
Mobile phones
n
PDAs
n
Portable electronic devices
Typical Application
Boomer is a registered trademark of National Semiconductor Corporation.
200960G5
FIGURE 1. Typical Audio Amplifier Application Circuit
March 2004
LM4664
Filterless
High
Efficiency
1.1W
Switching
Audio
Amplifier
2004 National Semiconductor Corporation
DS200960
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4665 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Filterless High Efficiency 1W Switching Audio Amplifier |
| LM4665 WAF | 制造商:Texas Instruments 功能描述: |
| LM4665B WAF | 制造商:Texas Instruments 功能描述: |
| LM4665ITL | 制造商:Texas Instruments 功能描述:Audio Amp Speaker 1-CH Mono 1.4W Class-AB 9-Pin uSMD T/R 制造商:Texas Instruments 功能描述:1W Class D Switching Amplifier,LM4665ITL |
| LM4665ITL/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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