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參數(shù)資料
| 型號： | LM4670ITLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Filterless High Efficiency 3W Switching Audio Amplifier |
| 中文描述： | 3 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封裝： | MICRO, SMD-9 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大?。?/td> | 1080K |
| 代理商： | LM4670ITLX |
LM4670
Filterless High Efficiency 3W Switching Audio Amplifier
General Description
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.
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 4
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.
The LM4670 has high efficiency with speaker loads com-
pared to a typical Class AB amplifier. With a 3.6V supply
driving an 8
speaker, the IC’s efficiency for a 100mW
power level is 77%, reaching 88% at 600mW output power.
The LM4670 features a low-power consumption shutdown
mode. Shutdown may be enabled by driving the Shutdown
pin to a logic low (GND).
The gain of the LM4670 is externally configurable which
allows independent gain control from multiple sources by
summing the signals.
Key Specifications
j
Efficiency at 3.6V, 100mW into 8
speaker 77% (typ)
j
Efficiency at 3.6V, 600mW into 8
speaker 88% (typ)
j
Efficiency at 5V, 1W into 8
speaker
j
Quiescent current, 3.6V supply
j
Total shutdown power supply current
j
Single supply range
87% (typ)
4.8mA (typ)
0.01μA (typ)
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
n
Available in space-saving microSMD and LLP packages
Applications
n
Mobile phones
n
PDAs
n
Portable electronic devices
Typical Application
Boomer
is a registered trademark of National Semiconductor Corporation.
20089901
FIGURE 1. Typical Audio Amplifier Application Circuit
December 2004
L
2004 National Semiconductor Corporation
DS200899
www.national.com
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PDF描述 |
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| LM4670SD | Filterless High Efficiency 3W Switching Audio Amplifier |
| LM4671 | Filterless High Efficiency 2.5W Switching Audio Amplifier |
| LM4680 | 10W High-Efficiency Mono BTL Audio Power Amplifier |
| LM4680SD | 10W High-Efficiency Mono BTL Audio Power Amplifier |
| LM4731 | Stereo 25W Audio Power Amplifier with Mute and Standby Modes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4670ITLX/NOPB | 功能描述:音頻放大器 Filterless Hi Eff 3W Switching Audio Amp 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4670SD | 制造商:Texas Instruments 功能描述:Audio Amp Speaker 1-CH Mono 3W Class-AB 8-Pin LLP EP T/R 制造商:Texas Instruments 功能描述:IC AMP AUDIO PWR 3W MONO D 8LLP 制造商:Texas Instruments 功能描述:AMP, AUDIO MONO CLASS D, SMD, LLP-8 制造商:Texas Instruments 功能描述:AMPLIFIER, AUDIO, CLASS AB, 3W, LLP-8; Amplifier Class:AB; No. of Channels:1; Output Power:3W; Supply Voltage Range:2.4V to 5.5V; Amplifier Case Style:LLP; No. of Pins:8; Load Impedance:4ohm; Operating Temperature Min:-40C ;RoHS Compliant: Yes 制造商:Texas Instruments 功能描述:3W Switching Audio Amplifier,LM4670SD |
| LM4670SD/NOPB | 功能描述:音頻放大器 Filterless Hi Eff 3W Switching Audio Amp 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4670SDX/NOPB | 功能描述:音頻放大器 Filterless Hi Eff 3W Switching Audio Amp 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4671 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Filterless High Efficiency 2.5W Switching Audio Amplifier |
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