功放芯片AP4990 CSP-9 .................................................................................................

PART NO.	LM386	AP4990
Working voltage	4.0V～12.0V	2.2V～5.5V
Quiescent current	4mA	1mA
ShutDown current	NO	0.1uA
Output power	6V=325mW,9V=700mW	5V=1W,3V=0.31W
Total Harmonic Distorio	THD=0.2%	THD+NOISE=0.1%
Power Supply Rejection Ratio	PSRR=50dB	5V=70dB,3V=64dB

以上是AP4990 & LM386芯片参数比较，更多的资料下载

9个脚在芯片下面3×3排列，pin中心点距是0.5mm，芯片尺寸大约1.5mm×1.5mm

专为手机、PHS等超小尺寸电路而设计。