FP6373AS6CTR from Fitipower Integrated Tech, in a SOT-23-6. 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 input pin. Pull high (VENH ≥ 1.5V) to turn on the IC; pull low (VENL ≤ 0.4V) to shut it down. Absolute max range -0.3V to VIN.
2	GND	power_in	Ground pin. Common return for the input capacitor, output capacitor, and internal synchronous NFET.
3	LX	output	Switching node. Connect an external inductor from LX to the output. Swings between GND and VIN each switching cycle at ~1MHz. Absolute max -0.3V to (VIN+0.3V).
4	VIN	power_in	Power supply input pin. Operating range 2.7V to 5.5V (abs max 6.5V). Place input decoupling capacitor (10µF MLCC typ) as close as possible from VIN to GND to avoid noise influence.
5	PG	output	Open-drain Power Good output. Pulls low when VFB is below ~90% of VREF; released when output is in regulation. Requires an external pull-up resistor. Sink capability 1mA at VPG=0.1V.
6	FB	input	Feedback input pin. Connect to the center tap of the output resistor divider to program VOUT = 0.6V × (1 + R1/R2). Internal reference VREF = 0.6V (typ), IFB ±50nA.

Key specifications

Parameter	Value
Manufacturer	Fitipower Integrated Tech
Package	SOT-23-6
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

FP6373AS6CTR

CAD (KiCad official)

Symbol: FP6373AS6CTR
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`fp6373as6ctr.step`	97 KB	You want the bare part, or you mark your own boards.
`fp6373as6ctr-etched.step`	2.4 MB	You want the part with `FP6373AS6CTR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 586 faces against 117 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 (13 pp, sha256 6461a3b32444eee7, 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