YST-8023-A LED lamp
Cheap desk LED lamp with built-in rechargeable battery, charged via micro USB.
Charging current: up to 450 mA. Can be charged and turned on at the same time.
Controlled with a capacitive touch sensor. Three light modes: cold (7 LEDs), warm (6 LEDs) and mixed (all LEDs active). Holding sensor changes light intensity. There is no physical power switch unfortunately, so there is a risk of accidental turning on.
Light intensity depends strongly on current charge level / battery voltage.
Case can hold either 14500 or 18650 cell.
Touch sensor electrode is visible on the left.
Included 14500 cell has very low capacity, 300 mAh. Real capacity might be even smaller, I should replace this cell with 18650 later.
LR4054 LiIon charging controller. I wasn't able to find in datasheet if this is supposed to be 4.20 V or 4.35 V version,
but after the test it turns out that fortunately it goes only up to 4.20 V.
A2sHB = SI2302 N-channel power MOSFETs (20V/3A/75mOhm max).
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