ME2188A50M3G from MICRONE, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	GND	power_in	Device ground reference. Must be tied solidly to system ground; per the datasheet's PCB layout note, incomplete grounding lets the internal zero-potential shift with switching current and destabilizes operation.
2	LX	power_out	Switching node (energy-conversion pin). Connects to the external boost inductor (typ. 22 µH) whose other terminal ties to VIN. Absolute max on LX is -0.3 to 6 V; ILXmax rated 1000 mA (current limit typ. 1000 mA, min 800 mA).
3	VOUT	power_out	Regulated boost output, fixed 5.0 V (±2%) for the A50 option code. Requires an external output capacitor (recommended 47 µF or larger, low-ESR tantalum preferred; 100 µF used in the typical application). Absolute max -0.3 to 6 V; rated 300 mA.

Key specifications

Parameter	Value
Manufacturer	MICRONE
Package	SOT-23
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

ME2188A50M3G
ME2188A50M3GX
ME2188A50M3GM5
ME2188A50M3GP
ME2188A50M3GT

CAD (KiCad official)

Symbol: ME2188A50M3G
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`me2188a50m3g.step`	59 KB	You want the bare part, or you mark your own boards.
`me2188a50m3g-etched.step`	2.4 MB	You want the part with `ME2188A50M3G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 572 faces against 69 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: MICRONE datasheet (11 pp, sha256 197aa5944f496234, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF