XL4005E1 from XLSEMI, in a TO-263-5. 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	GND	power_in	Ground pin. Should be placed outside the Schottky diode-to-output-capacitor ground path to prevent switching current spikes from inducing voltage noise into the XL4005.
2	FB	input	Feedback pin. Senses the output voltage through an external resistor divider network and regulates it. Feedback threshold voltage is 0.8V.
3	SW	output	Power switch output pin. Switch node connected to the internal power MOSFET (25 mΩ) that supplies power to the output inductor. Also connected to the exposed metal tab of the TO263-5L package.
4	EN	input	Enable pin. Drive high (>1.4V) to turn the device on; drive low (<0.8V) to turn it off. TTL-compatible with hysteresis.
5	VIN	power_in	Supply voltage input pin. Operates from 5V to 32V DC (absolute max 35V). Bypass VIN to GND with a suitably large capacitor (e.g. 220µF/50V) to eliminate input noise.

Key specifications

Parameter	Value
Manufacturer	XLSEMI
Package	TO-263-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

XL4005E1

CAD (KiCad official)

Symbol: XL4005E1
Footprint: Package_TO_SOT_SMD:TO-263-5_TabPin6
3D model: TO-263-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`xl4005e1.step`	180 KB	You want the bare part, or you mark your own boards.
`xl4005e1-etched.step`	1.6 MB	You want the part with `XL4005E1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 448 faces against 135 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 dccfa80a42b888ff, 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