SL9451 from Slkor SLKORMICRO Elec, in a SOT-23-6L. 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	BST	passive	Bootstrap pin. Positive supply for the internal floating high-side MOSFET driver. Connect a bypass capacitor (typ. 100nF) between this pin and SW; internally charged to about 5V via an internal bootstrap regulator.
2	GND	power_in	Ground pin. Route as close as possible to the output capacitor, avoiding high-current switching paths.
3	FB	input	Feedback input to the error amplifier. An external resistor divider from VOUT to GND compared against the internal 0.794V (typ) reference sets the regulated output voltage. Also interacts with the internal RC compensation network.
4	EN	input	Enable input. Drive above ~1.6V (typ 2.0V) to enable the chip; pull below the threshold to shut down. 0.6V hysteresis; internally clamped to 7.5V. Floating pulls low internally (device disabled).
5	VIN	power_in	Power input, 4.2V to 40V (abs max 43V). Supplies all internal control circuitry and the high-side power switch. Requires a local decoupling capacitor (typ 4.7uF/50V) to GND to reduce switching spikes.
6	SW	output	Switch node - high-side power MOSFET output (500mΩ Rdson typ, 1A current limit). Connect to the inductor and a low-Vf Schottky freewheel diode to GND placed close to the pin to reduce switching spikes.

Key specifications

Parameter	Value
Manufacturer	Slkor SLKORMICRO Elec
Package	SOT-23-6L
Category	PMIC
Pins	6

CAD (KiCad official)

Symbol: SL9451
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sl9451.step`	97 KB	You want the bare part, or you mark your own boards.
`sl9451-etched.step`	1.3 MB	You want the part with `SL9451` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 332 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: Slkor SLKORMICRO Elec datasheet (9 pp, sha256 e647ca8661d4bc1f, 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