ME2109FM5G 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	FB	input	Feedback voltage input. Compares the divided output voltage against the internal 1.25 V reference (VFB typ 1.25 V, min 1.225 V / max 1.275 V) to regulate VOUT. Set VOUT with R1/R2 divider, keeping R1+R2 < 50 kΩ.
2	VDD	power_in	IC power supply pin. Recommended operating range 1.8 V ≤ VDD < 6 V (absolute max 6.5 V). Start-up guaranteed from 0.9 V at IOUT = 1 mA.
3	CE	input	Chip enable / shutdown pin. VCE ≥ 0.75 V enables oscillation; VCE ≤ 0.3 V (VOUT ≥ 1.5 V) or ≤ 0.2 V (VOUT < 1.5 V) forces shutdown (ISSS typ 0.01 µA). Absolute max: -0.3 V to VIN+0.3 V.
4	GND	power_in	Ground reference pin for the IC.
5	EXT	output	External N-channel power MOSFET gate drive output. Sourcing IEXTH typ -25 mA (VEXT = VOUT-0.4 V), sinking IEXTL typ 40 mA (VEXT = 0.4 V). Absolute max current ±1000 mA. Voltage limited to VDD+0.3 V.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

ME2109FM5G

CAD (KiCad official)

Symbol: ME2109FM5G
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

Provenance

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

Datasheet: MICRONE datasheet (13 pp, sha256 639c20dfdb996e59, 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