LM4991
- Available in Space-Saving WSON and SOIC Packages
- Ultra Low Current Shutdown Mode
- Can Drive Capacitive Loads up to 500pF
- Improved Click and Pop Circuitry Reduces Noises During Turn-On and Turn-Off Transitions
- 2.2 - 5.5V Operation
- No Output Coupling Capacitors, Snubber Networks, Bootstrap Capacitors or Gain-Setting Resistors Required
- Unity-Gain Stable
Key Specifications
- Improved PSRR at 217kHz and 1kHz: 64 dB (typ)
- PO at VDD = 5.0V, 10% THD, 1kHz
- LM4991LD (only), 3Ω, 4Ω: 3W (typ), 2.5 W (typ)
- All packages, 8Ω load: 1.5 W (typ)
- Shutdown current: 0.1µA (typ)
All trademarks are the property of their respective owners.
The LM4991 is a mono bridged audio power amplifier capable of delivering 3W of continuous average power into a 3Ω load with less than 10% THD when powered by a 5V power supply (see Note below). To conserve power in portable applications, the LM4991's micropower shutdown mode (ISD = 0.1µA, typ) is activated when VDD is applied to the SHUTDOWN pin.
Boomer audio power amplifiers are designed specifically to provide high power, high fidelity audio output. They require few external components and operate on low supply voltages from 2.2V to 5.5V. Since the LM4991 does not require output coupling capacitors, bootstrap capacitors, or snubber networks, it is ideally suited for low-power portable systems that require minimum volume and weight.
Additional LM4991 features include thermal shutdown protection, unity-gain stability, and external gain set.
Note: An LM4991LD that has been properly mounted to a circuit board will deliver 3W into 3Ω (at 10% THD). The other package options for the LM4991 will deliver 1.5W into 8Ω (at 10% THD). See the sections for further information concerning the LM4991LD and LM4991M.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM4991 3W Audio Power Amplifier with Shutdown Mode datasheet (Rev. A) | 2013年 4月 5日 |
設計與開發
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOIC (D) | 8 | Ultra Librarian |
| WSON (NGN) | 8 | Ultra Librarian |
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
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點