XL4301E1 from XLSEMI, in a SOIC-8-EP. 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	NC	unconnected	Not connected. Leave floating or tie to ground per PCB convention.
2	SW	output	Power switch output. Drain of the internal high-side MOSFET; connects to the external inductor/catch diode of the buck converter. The back exposed pad is internally tied to SW and should be connected to this node on the PCB.
3	GND	power_in	Ground reference for the IC and the return for the input/output bypass capacitors.
4	FB	input	Feedback input to the internal error amplifier. Senses the regulated output through an external resistor divider; regulation threshold is 1.25 V typical (VOUT = 1.25 V x (1 + R2/R1)).
5	CS	input	Output current sense input for the constant-current loop. Load current is set by an external sense resistor: Iload = 0.11 V / RCS (VCS typ. 110 mV).
6	LC	input	Output cable-loss compensation input. A user-programmable resistor (R3) from this pin to ground selects the amount of voltage-drop compensation added to the output as a function of load current (see Table 2).
7	VC	passive	Internal voltage regulator bypass pin. Connect a 1 uF capacitor from VC to VIN to decouple the internal LDO that supplies the control circuitry.
8	VIN	power_in	Supply voltage input, 8 V to 40 V DC operating range (45 V absolute maximum). Bypass to GND with a suitably large low-ESR capacitor (e.g. 100 uF/50 V) close to the pin to eliminate input noise.

Key specifications

Parameter	Value
Manufacturer	XLSEMI
Package	SOIC-8-EP
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

XL4301E1

CAD (KiCad official)

Symbol: XL4301E1
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm
3D model: SOIC-8-EP (KiCad packages3D, STEP)

Provenance

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

Datasheet: XLSEMI datasheet (10 pp, sha256 3f3b4c16d0fca911, retrieved 2026-08-17, tier: manufacturer)
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