Maxim MAX98304单声道3.2W D类音频放大解决方案

Maxim 公司的MAX98304是单声道3.2W D类音频放大器，提供AB类音频性能和D类效率，提供五种引脚选择的增益（0dB,3dB,6dB,9dB和12dB），3.7V的静态电流0.95mA，超低噪音19μVRMS，PSRR为90dB，开关噪音抑制，热和过流保护，低电流关断模式。主要应用在笔记本和上网本电脑，手机，平板电脑，MP3播放器，手持音频播放器，VoIP电话。本文介绍了MAX98304主要特性，功能方框图，典型应用电路图，MAX98304评估板主要特性，电路图，材料清单和PCB元件布局图。

The MAX98304 mono 3.2W Class D amplifier provides Class AB audio performance with Class D efficiency. This device offers five selectable gain settings (0dB, 3dB, 6dB, 9dB, and 12dB) set by a single gain-select input (GAIN).

Active emissions-limiting, edge-rate, and overshoot control circuitry greatly reduces EMI. A filterless spreadspectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices. These features reduce application component count.
The IC’s 0.95mA at 3.7V (1.2mA at 5V) quiescent current extends battery life in portable applications.

The IC is available in a 9-bump (1.0mm x 1.0mm) WLP with 0.3mm pitch that is specified over the extended -40NC to +85NC temperature range.

MAX98304主要特性：

Low Quiescent Current: 0.95mA at 3.7V

Spread Spectrum and Active Emissions Limiting

Five Pin-Selectable Gains

19μVRMS Ultra-Low Noise

90dB PSRR

Click-and-Pop Suppression

Thermal and Overcurrent Protection

Low-Current Shutdown Mode

1.0mm x 1.0mm, 9-Bump WLP (0.3mm Pitch) Space-Saving Package

MAX98304应用：

Notebook and Netbook Computers

Cellular Phones

Tablets

MP3 Players

Portable Audio Players

VoIP Phones

相关阅读:

• ...2012/01/31 10:32·MAX5033的高亮度LED电源原理图
• ...2011/12/19 10:21·Maxim DS1878高频光收发参考设计HFRD-49.1
• ...2011/10/18 14:27·基于MAX713的大功率多功能充电器的设计
• ...2011/05/25 16:23·Single Supercapacitor Charger from 1.8V to 5.5V Input to 5V Output (1000mA Max Input Current)
• ...2011/05/20 10:41·Stacked Supercapacitor Charger from 1.8V to 5.5V Input to 5V Output (1000mA Max Input Current)
• ...2011/05/20 10:40·USB-GSM application with 5V USB input (500mA max) charging a 4.4mF super cap (3.4V at 800mA) and providing 1.8V at 400mA