XL1583E1 from XLSEMI, in a SOIC-8. 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	No connect. Not internally bonded; leave floating or tie to ground for mechanical stability.
2	VIN	power_in	Supply voltage input. Operates from 3.6V to 28V DC (absolute max 32V). Bypass to GND with a suitably large low-ESR capacitor (typ. 220uF/35V) placed close to the pin to eliminate input noise.
3	SW	output	Power switch output node. Internal high-side MOSFET (~43mOhm) switches this pin between VIN and GND at 380 kHz; connects to the external inductor and catch Schottky diode of the buck converter. Current limit is typically 4.7A.
4	GND	power_in	Ground reference for the IC. Route outside the Schottky diode-to-output-capacitor ground path to prevent switching current spikes from injecting noise into the device.
5	FB	input	Feedback input. Compares the divided output voltage against the internal 1.222V reference to regulate VOUT via an external resistor divider: VOUT = 1.222 * (1 + R2/R1).
6	NC	unconnected	No connect. Not internally bonded; leave floating or tie to ground for mechanical stability.
7	EN	input	Enable input with hysteresis. Drive high (>=1.4V typ.) to turn the regulator on; drive low (<=0.8V typ.) to shut down (Is ~60uA). Floating defaults high. Absolute max VEN = VIN.
8	NC	unconnected	No connect. Not internally bonded; leave floating or tie to ground for mechanical stability.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

XL1583E1

CAD (KiCad official)

Symbol: XL1583E1
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`xl1583e1.step`	122 KB	You want the bare part, or you mark your own boards.
`xl1583e1-etched.step`	1.7 MB	You want the part with `XL1583E1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 427 faces against 147 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: XLSEMI datasheet (10 pp, sha256 3c15efb52e39a748, 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