- 制造厂商：TI
- 产品类别：音频
- 技术类目：音频放大器 - 扬声器放大器
- 功能描述：具有 DC 音量控制和可选增益的立体声 2W 音频功率放大器
- 点击这里打开及下载LM4938的技术文档资料
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The LM4938 is a monolithic integrated circuit that provides DC volume control, and stereo bridged audio power amplifiers capable of producing 2W into 4? with less than 1.0% THD or 2.2W into 3? with less than 1.0% THD.
Boomer audio integrated circuits were designed specifically to provide high quality audio while requiring a minimum amount of external components. The LM4938 incorporates a DC volume control, stereo bridged audio power amplifiers and a selectable gain or bass boost, making it optimally suited for multimedia monitors, portable radios, desktop, and portable computer applications.
The LM4938 features an externally controlled, low-power consumption shutdown mode, and both a power amplifier and headphone mute for maximum system flexibility and performance.
Note 1: When properly mounted to the circuit board, LM4938MH will deliver 2W into 4?. See Application Information section for more information.
Note 2: An LM4938MH that has been properly mounted to the circuit board and forced-air cooled will deliver 2.2W into 3?.
- Improved Click and Pop Circuitry Virtually Eliminates Noise During Turn On/Off Transitions
- DC Volume Control Interface
- System Beep Detect
- Stereo Switchable Bridged/Single-Ended Power Amplifiers
- Selectable Internal/External Gain and Bass Boost
- Thermal Shutdown Protection Circuitry
- Unity Gain Stable
- PO at 1% THD+N
- into 3Ω: 2.2W (typ)
- into 4Ω: 2.0W (typ)
- into 8Ω: 1.3W (typ)
- Single-ended mode
- THD+N at 92mW into 32Ω: 1.0% (typ)
- Shutdown Current: 0.5μA (typ)
All trademarks are the property of their respective owners.
- Audio input type
- Analog Input
- Architecture
- Class-AB
- Speaker channels (Max)
- Stereo
- Power stage supply (Max) (V)
- 5.5
- Power stage supply (Min) (V)
- 2.7
- Load (Min) (ohms)
- 3
- Output power (W)
- 2.2
- THD + N @ 1 kHz (%)
- 0.05
- Iq (Typ) (mA)
- 11
- Control interface
- GPIO
- Closed/open loop
- Open
- Analog supply (Min) (V)
- 2.7
- Analog supply (Max) (V)
- 5.5
- PSRR (dB)
- 78
- Operating temperature range (C)
- -20 to 85
LM4938的完整型号有：LM4938MH/NOPB、LM4938MHX/NOPB，以下是这些产品的关键参数及官网采购报价：
LM4938MH/NOPB，工作温度：-20 to 85，封装：HTSSOP (PWP)-28，包装数量MPQ：48个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM4938MH/NOPB的批量USD价格：1.145（1000+）
LM4938MHX/NOPB，工作温度：-20 to 85，封装：HTSSOP (PWP)-28，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM4938MHX/NOPB的批量USD价格：.954（1000+）
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