Yup, it’s the PAM2803 or a clone. Been around for ages and in many common lights (pretty sure even the Lumintop AAA lights use it). There are even BLF designs going back years ago that used this chip. Multi-mode versions with this basically swap out the current sense resistor using small FETs driven from a SOT23-6 MCU (link)
Single-mode layout is super simple too:
