Hi guys, out of curiosity, I tried reverse engineering my flashlight's over engineered driver board to know how it works and because, sometimes the brightness control goes slow responding or the brightness levels goes crazy. (mostly fixed by randomly resoldering all the components in the whole assembly) It consists of three boards in a 3D arrangement. I pretty much reverse engineered the schematic with only three semiconductors I could not identify.
I tried to do a bit of googling but could not identify IC1 the DC to DC boost converter in SOT23-6 which is marked "WB5n3" (disregard the writing in the schem, I misspelled it there) and appears to have a similar pinout to some LT devices and quite close to a MP3120 but is not a synchronous type.
IC2 is also a SOT23-6 looks like a mosfet, load switch or current sensor? It is marked "D9EA".
Op amp is SOT23-5 marked "SBUS" but I could not find that also. This one is probably some generic low supply voltage rail to rail op amp.
I already identified the LDO as XC6206 252MR