MT36291 from Aerosemi, 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	SW	power_out	Power Switch Output. Drain of the internal 80mΩ N-channel power MOSFET. Connect the boost inductor and the Schottky output rectifier here. SW node can swing between GND and 22V.
2	GND	power_in	Ground pin. Connect to a solid ground plane for heat sinking and noise protection.
3	FB	input	Feedback input to the internal error amplifier. Regulated to the 0.6V internal bandgap reference. Connect an external resistor divider from VOUT to FB to GND to set the output voltage: VOUT = 0.6V x (1 + R1/R2). FB input bias current is typically -10nA.
4	EN	input	Regulator On/Off Control Input. Drive high (>1.5V) to enable the converter, low (<0.6V) to shut it down (shutdown current ~0.1µA). Tie to VIN for automatic startup. Absolute max 18V.
5	VIN	power_in	Input supply pin, 2.2V to 16V operating range (18V absolute max). Must be locally bypassed with a low-ESR ceramic capacitor (22µF X5R/X7R recommended) placed close to the IC.
6	OC	input	Adjustable peak switch current limit. Connect a resistor (19kΩ to 96kΩ) from OC to GND to program the current limit from 2.5A down to 0.5A per IOCP = 48000/R. Leave floating to use the internal 2.5A default current limit. Keep trace short.

Key specifications

Parameter	Value
Manufacturer	Aerosemi
Package	SOT-23-6
Category	PMIC
Pins	6

CAD (KiCad official)

Symbol: MT36291
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
`mt36291.step`	97 KB	You want the bare part, or you mark your own boards.
`mt36291-etched.step`	1.6 MB	You want the part with `MT36291` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 385 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: Aerosemi datasheet (9 pp, sha256 863d456e8ebecc44, 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