LM2675M-3.3 from UMW, in a SOP-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	CB	passive	Bootstrap capacitor terminal. External capacitor (typ. 10 nF, 50 V) connects between CB and VSW to provide bootstrapped gate drive for the internal high-side power switch.
2	NC	unconnected	No connection (empty port). Leave floating or tie to GND per board convention.
3	NC	unconnected	No connection (empty port). Leave floating or tie to GND per board convention.
4	FB	input	Feedback control input to the internal error amplifier. For the fixed 3.3 V version this pin is tied directly to VOUT; the internal reference regulates FB to the nominal output. Abs-max VFB = -0.3 V to VIN.
5	ON/OFF	input	TTL-compatible enable input with hysteresis. Logic HIGH (VON >= 1.5 V) enables the regulator; logic LOW (VOFF <= 0.8 V) puts the part in shutdown (ISTB ~ 100 uA). Abs-max -0.3 V to 6 V.
6	GND	power_in	Power supply ground / device reference. Connect to system ground plane.
7	VIN	power_in	Positive supply input to the internal power switch and control circuitry. Operating range 7 V to 40 V; absolute-max 45 V. Bypass locally with an input capacitor (typ. 100 uF).
8	VSW	power_out	Power switch output (SW node). Connects to the external inductor and catch (Schottky) diode of the buck power stage. Abs-max -1 V to VIN; peak switch current limit ~2 A.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	SOP-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

LM2675M-3.3

CAD (KiCad official)

Symbol: LM2675M-3.3
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lm2675m-3-3.step`	122 KB	You want the bare part, or you mark your own boards.
`lm2675m-3-3-etched.step`	2.1 MB	You want the part with `LM2675M-3.3` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 511 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: UMW datasheet (14 pp, sha256 596039c1658a306f, 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