component

XL4003E1

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by Ray

XLSEMI DC-DC Converters, TO-252-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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XL4003E1

XLSEMI · DC-DC Converters · TO-252-5

XL4003E1 from XLSEMI, in a TO-252-5. 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. Must be placed outside the Schottky diode-to-output-capacitor ground path to prevent switching current spikes from inducing voltage noise into the IC.
2 FB input Feedback pin. Senses the output voltage through an external resistor divider and regulates it. Internal feedback threshold voltage is 0.8V; Vout = 0.8 * (1 + R2/R1).
3 SW output Power switch output pin. Switch node that supplies power to the external inductor / Schottky diode / output filter. The metal tab is electrically connected to SW.
4 EN input Enable pin with hysteresis and TTL-compatible shutdown. Drive high (>=1.4V) to turn on the regulator, drive low (<=0.8V) to turn it off. Shutdown supply current ~60uA typ.
5 VIN power_in Supply voltage input pin. Operates from 5V to 32V DC (absolute max 35V). Bypass to GND with a suitably large capacitor (e.g. 220uF/50V) to eliminate input noise.

Key specifications

Parameter Value
Manufacturer XLSEMI
Package TO-252-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • XL4003E1

CAD (KiCad official)

  • Symbol: XL4003E1
  • Footprint: Package_TO_SOT_SMD:TO-252-5_TabPin6
  • 3D model: TO-252-5 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: XLSEMI datasheet (10 pp, sha256 d43184d7af2696e6, 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