Download the AP3845G datasheet PDF.
This datasheet also covers the AP3843G_ShanghaiSIM variant, as both devices belong to the same green mode pwm controller family and are provided as variant models within a single manufacturer datasheet.
Note: The manufacturer provides a single datasheet file (AP3843G_ShanghaiSIM-BCDSemiconductor.pdf) that lists specifications for multiple related part numbers.