LM4670
- No Output Filter Required for Inductive Loads
- Externally Configurable Gain
- Very Fast Turn on Time: 1.35ms (Typ)
- Minimum External Components
- "Click and Pop" Suppression Circuitry
- Micro-Power Shutdown Mode
- Short Circuit Protection
- Available in Space-Saving DSBGA and WSON Packages
Key Specifications
- Efficiency at 3.6V, 100mW into 8Ω Speaker, 77% (Typ)
- Efficiency at 3.6V, 600mW into 8Ω Speaker, 88% (Typ)
- Efficiency at 5V, 1W into 8Ω Speaker, 87% (Typ)
- Quiescent Current, 3.6V Supply, 4.8mA (Typ)
- Total Shutdown Power Supply Current, 0.01µA (Typ)
- Single Supply Range, 2.4 to 5.5V
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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 component 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 modulators.
The LM4670 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 2.3W 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 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 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.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM4670 Filterless High Efficiency 3W Switching Audio Amplifier datasheet (Rev. C) | 2013年 5月 2日 |
設計與開發
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PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
| 封裝 | 引腳 | 下載 |
|---|---|---|
| DSBGA (YZR) | 9 | 檢視選項 |
| WSON (NGQ) | 8 | 檢視選項 |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 資格摘要
- 進行中可靠性監測
- 晶圓廠位置
- 組裝地點
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。