FP6381AS5CTR from Fitipower Integrated Tech, in a SOT-23-5. 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	EN	input	Enable control pin. Pull high (VIH >= 1.5V) to turn the IC on, pull low (VIL <= 0.4V) to disable. Must not be left floating.
2	GND	power_in	Ground pin. Power return for the internal N-channel low-side MOSFET and control circuitry.
3	LX	output	Power switching output node. Connect the external inductor between LX and the output filter capacitor. Rated to VIN+0.3V max. Internal 100Ω discharge resistance when disabled.
4	VIN	power_in	Power supply input pin, 2.5V to 6V operating range (6.5V absolute max). Place input decoupling capacitor (e.g. 4.7µF MLCC) as close as possible from VIN to GND to minimize noise.
5	FB	input	Voltage feedback input pin. Connect FB to VOUT through a resistive divider; the internal error amplifier regulates FB to VREF = 0.6V (typ, 0.588V-0.612V). Input leakage <= 1µA.

Key specifications

Parameter	Value
Manufacturer	Fitipower Integrated Tech
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

FP6381AS5CTR
FP6381AS5CTRS6CTR
FP6381AS5CTRS8CTR

CAD (KiCad official)

Symbol: FP6381AS5CTR
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`fp6381as5ctr.step`	85 KB	You want the bare part, or you mark your own boards.
`fp6381as5ctr-etched.step`	2.4 MB	You want the part with `FP6381AS5CTR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 582 faces against 102 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: Fitipower Integrated Tech datasheet (15 pp, sha256 4b3207bd5495340b, 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