LM4673
- Mono Class D Operation
- No Output Filter Required for Inductive Loads
- Externally Configurable Gain
- Very Fast Turn On Time: 17μs (typ)
- Minimum External Components
- "Click and Pop" Suppression Circuitry
- Micro-Power Shutdown Mode
- Available in Space-Saving 0.4mm Pitch DSBGA and WSON Packages
Key Specifications
- Efficiency at 3.6V, 400mW into 8Ω Speaker 88% (typ)
- Efficiency at 3.6V, 100mW into 8Ω Speaker 80% (typ)
- Efficiency at 5V, 1W into 8Ω Speaker 86% (typ)
- Quiescent Current, 3.6V Supply 2.1mA (typ)
- Total
Shutdown Power Supply Current
0.01µA (typ) - Single Supply Range 2.4V to 5.5V
- PSRR, f = 217Hz 78dB
All trademarks are the property of their respective owners.
The LM4673 is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.
The LM4673 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4Ω speaker load at a continuous average output of 2.1W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V.
The LM4673 has high efficiency with speaker loads compared 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 80%, reaching 88% at 400mW output power.
The LM4673 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 LM4673 is externally configurable which allows independent gain control from multiple sources by summing the signals. Output short circuit and thermal overload protection prevent the device from damage during fault conditions.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | LM4673 Filterless, 2.65W, Mono, Class D Audio Power Amplifier datasheet (Rev. D) | 2013/5/1 | |||
| 應用說明 | Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) | 2019/8/26 | ||||
| 應用說明 | AN-1849 An Audio Amplifier Power Supply Design (Rev. C) | 2019/6/27 | ||||
| 應用說明 | AN-1737 Managing EMI in Class D Audio Applications (Rev. A) | 2013/5/1 | ||||
| 應用說明 | AN-1614 LM48510 Speaker AN- (Rev. B) | 2013/5/1 | ||||
| 應用說明 | AN-1497 Filterless Class D Amplifiers (Rev. A) | 2013/5/1 |
設計與開發
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LM4673TMBD — LM4673TMBD 免濾波、2.65W、單聲道 D 類音訊功率放大器評估板
The LM4673 is a filterless 2.65W class D fully differential audio amplifier in an 8 pin LLP package. The LM4673 is designed to meet the demands of mobile phones and other portable communication devices. It is capable of delivering 1.24 Watts of average power to an 8 ohm load with less than 1% (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WSON (NGQ) | 8 | Ultra Librarian |
| DSBGA (YFQ) | 9 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。