STI9287 from TMI, 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	output	Power switch node: drain of the integrated NMOS. Connects to the boost inductor and Schottky rectifier. Rated -0.3V to 35V absolute max; NMOS RDS(on) ≈ 0.2Ω; peak current limit 1.2-1.4A.
2	GND	power_in	Device ground. Should be tied to a strong ground plane for heat sinking and noise protection.
3	FB	input	Output voltage / LED current feedback pin. Regulated to 202mV (196-208mV) when EN/PWM is high; the LED current is set by the sense resistor R1 as ILED = 202mV / R1.
4	EN/PWM	input	Chip enable and PWM dimming input. Drive above 1.5V to turn on, below 0.4V to turn off. A PWM signal (recommended ≥1kHz or ≤200Hz) scales the effective 202mV reference by its duty cycle for LED brightness control. Do not leave floating. Absolute max 25V; leakage ±1µA.
5	OVP	input	Over-voltage sense input for open-LED protection. Connect to the top of the LED string / boost output. Switching stops when OVP rises above ~30V and resumes when it falls below ~25V. Absolute max -0.3V to 35V.
6	IN	power_in	Power supply input, 2.5V to 7V (absolute max 8V). Must be decoupled to GND with a ≥1µF ceramic capacitor placed close to the pin. UVLO threshold ≈ 2.4V with 100mV hysteresis.

Key specifications

Parameter	Value
Manufacturer	TMI
Package	SOT-23-6
Category	LED-drv
Pins	6

CAD (KiCad official)

Symbol: STI9287
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
`sti9287.step`	97 KB	You want the bare part, or you mark your own boards.
`sti9287-etched.step`	1.6 MB	You want the part with `STI9287` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 390 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: TMI datasheet (10 pp, sha256 3f6e57b764306e99, 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