TC6291C from Shenzhen Fuman, in a SOT-23-6. 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	LX	output	Switching node - drain of the internal 0.2Ω, 2A, 16V N-channel power MOSFET. Connects to the boost inductor and Schottky rectifier cathode. Absolute max voltage 16V.
2	GND	power_in	IC ground return for the internal MOSFET source, control logic and current-sense amplifier. Should tie directly to the ground plane close to CIN/COUT.
3	FB	input	Inverting input of the error amplifier. Connect to the mid-point of the output resistor divider; regulation target Vref = 0.6V (±2%). VOUT = 0.6V × (1 + R1/R2). Absolute max 6V.
4	EN	input	Enable input, active high. VEN ≥ 0.96V turns the converter on; VEN ≤ 0.6V shuts it down (IQ ≈ 0.1µA). Absolute max 6V.
5	VCC	power_in	IC supply input. Operating range 2.6V to 5.5V, UVLO ≈ 2.2V (0.1V hysteresis). Absolute max 6V. Decouple close to the pin with low-ESR ceramic.
6	OC	input	Adjustable peak-current-limit programming pin. A resistor from OC to GND (36kΩ-100kΩ) sets the peak switch current from ~1.5A down to 0.5A per IOCP = 55000/R. Leaving OC floating gives the default (~2A typ, 2.6A max) internal limit. Do not add capacitance on this pin.

Key specifications

Parameter	Value
Manufacturer	Shenzhen Fuman
Package	SOT-23-6
Category	PMIC
Pins	6

CAD (KiCad official)

Symbol: TC6291C
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tc6291c.step`	97 KB	You want the bare part, or you mark your own boards.
`tc6291c-etched.step`	1.6 MB	You want the part with `TC6291C` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 374 faces against 117 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: Shenzhen Fuman datasheet (10 pp, sha256 bc0dc73401217660, 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