XL1509-12 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	VIN	power_in	Supply Voltage Input Pin. Operates from 4.5V to 40V DC (absolute max 45V). Bypass VIN to GND with a suitably large capacitor to eliminate input noise.
2	OUTPUT	output	Power Switch Output Pin (SW). Internal power transistor switch node that supplies power to the output LC filter. Rated for 2A continuous, internal current limit ~4A. Absolute max -0.3V to VIN.
3	FEEDBACK	input	Feedback Pin (FB). Senses the output voltage through an external resistor divider and regulates it. Internal feedback threshold is 1.23V. For the fixed 12V variant the internal divider sets VOUT = 12V (typ, range 11.52V-12.48V).
4	ON/OFF	input	Enable/Shutdown pin with hysteresis. Drive low (<0.8V) to turn the regulator ON, drive high (>1.4V) to turn it OFF. TTL-compatible; floating defaults to low (ON). Input leakage ~5 uA.
5	GND	power_in	Ground pin. Route outside the Schottky-diode-to-output-capacitor ground path to avoid coupling switching current spikes into the IC. Tie all GND pins (5,6,7,8) together at the ground plane.
6	GND	power_in	Ground pin. Route outside the Schottky-diode-to-output-capacitor ground path to avoid coupling switching current spikes into the IC. Tie all GND pins (5,6,7,8) together at the ground plane.
7	GND	power_in	Ground pin. Route outside the Schottky-diode-to-output-capacitor ground path to avoid coupling switching current spikes into the IC. Tie all GND pins (5,6,7,8) together at the ground plane.
8	GND	power_in	Ground pin. Route outside the Schottky-diode-to-output-capacitor ground path to avoid coupling switching current spikes into the IC. Tie all GND pins (5,6,7,8) together at the ground plane. On ESOP-8 these pins are also connected to the exposed thermal pad for heatsinking.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

XL1509-12E1

CAD (KiCad official)

Symbol: XL1509-12
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
`xl1509-12.step`	122 KB	You want the bare part, or you mark your own boards.
`xl1509-12-etched.step`	1.7 MB	You want the part with `XL1509-12` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 435 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 (15 pp, sha256 bd5713838034a224, 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