This part is a kind of semiconductor called L2003.
Function of this product has Current Mode PWM Controller.
Manufacturers : LIZE
Image and pinout :

Some of the text within the PDF file :
Shenzhen LIZE Electronic Technology Co., Ltd SPECIFICATION L2003 Current Mode PWM Controller VERSION 1.0 reserves the right to change this documentation without prior notice Shenzhen LIZE Electronic Technology Co., Ltd L2003 Current Mode PWM Controller Frequency Shuffling L2003 是一款高效率升压 DC/DC 转换控制芯片,SW 端最高 15V 耐压。 待机电流<3uA。具有恒流恒压输出模式。 主要特性 : 1、高效率:95% 2、650KHz 恒定开关频率。 3、2.5A 输出电流能力(VIN >3.7V ) 4、输出电压精度+1.8% 5、电流模式实现优异的线性和负载瞬态响应 6、待机电流<3μA。 7、内置过温保护电路。 典型应用电路(恒流恒压模式)A:Vout=5V, Iout=2A。 reserves the right to change this documentation withou [ ... ]
L2003 PDF Datasheet Download
