ME2149FM5G from MICRONE, in a SOT-23-5. 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	CE	input	Chip enable / shutdown pin. Active-high enable: VSH ≥ 0.75V enables the oscillator, VSL ≤ 0.2-0.3V shuts down the IC. Shutdown current (ISSS) typ. 0.02µA, max 0.5µA at VCE=0V.
2	LX	output	Switching node - drain of the internal N-channel power MOSFET, connected to the external inductor/Schottky-diode node of the boost converter. Absolute max LX voltage -0.3 to VDD+0.3V; peak LX current ±4A. SOT23-5 recommended load ≤1A.
3	GND	power_in	Device ground reference. Return for internal power MOSFET source, control logic and reference.
4	VDD	power_in	IC power supply pin. Operating range 2.5V ≤ VDD ≤ 6V for stable operation; start-up guaranteed from 0.9V (IOUT=1mA). Absolute maximum -0.3 to 6.5V. Bypass with 0.1µF ceramic close to pin.
5	FB	input	Feedback voltage input to the internal error amplifier. Regulated to VFB = 1.25V typ (1.225-1.275V, ±2%). Set output with external divider R1/R2 from VOUT to GND.

Key specifications

Parameter	Value
Manufacturer	MICRONE
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

ME2149FM5G
ME2149FM5GP5
ME2149FM5GS

CAD (KiCad official)

Symbol: ME2149FM5G
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`me2149fm5g.step`	85 KB	You want the bare part, or you mark your own boards.
`me2149fm5g-etched.step`	1.7 MB	You want the part with `ME2149FM5G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 431 faces against 102 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 (13 pp, sha256 12aea13e59a159b5, retrieved 2026-08-17, tier: lcsc)
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