PAM8404概述：
The PAM8404 is a 3W high efficiency filterless class-D audio amplifier in 4mmX4mm and 2mmX2mm wafer chip scale packages that requires few external components.
Features like 89% efficiency, -63dB PSRR,improved RF-rectification immunity, and very small PCB area make the class-D amplifier ideal for cellular handset and PDA applications.
In cellular handsets, the earpiece, speaker phone,and melody ringer can each be driven by the PAM8404.The allows independent gain by summing signals from seperate sources, and
has as low as 43 V noise floor.
PAM8404 is available in QFN 4mmx4mm and WCSP 2mmx2mm packages.
PAM8404特性：
3W Output at 10% THD with a 4 Load and
5V Supply
Supply Voltage from 2.5V to 5.5 V
Efficiency Up to 89%
Superior Low Noise without Input
Few External Components to Save the Space
and Cost
Short Circuit Protection
Thermal Shutdown
Space Saving Packages :
2mm X 2mm WCSP
4mm X 4mm Thin QFN
Pb-Free Packages
PAM8404应用：
LCD Monitor / TV Projector
Notebook Computers
Portable Speakers
Portable DVD Players, Game Machines
Cellular Phones/Speaker Phones
PAM8404典型应用电路图：
PAM8404管脚分布：
PAM8404管脚定义：
PAM8404功能框图：
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PAM8404封装图：
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