AOZ1284PI from Alpha Omega Semicon, in a SOIC-8-EP. 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	LX	output	PWM switch node output. Connect to the external inductor of the buck converter. Swings from ~GND to ~VIN at the switching frequency; abs-max -0.7V to VIN+0.3V.
2	BST	power_in	Bootstrap voltage pin. Driver supply for the high-side NMOS. Connect a 100 nF ceramic capacitor between BST and LX; abs-max -0.3V to VLX+6V.
3	GND	power_in	Ground pin. Signal and power ground reference for the IC.
4	FSW	input	Frequency bias pin. Connect a resistor (RF) from FSW to GND to program the switching frequency from 200 kHz (RF≈270 kΩ) to 2 MHz.
5	COMP	output	Error amplifier compensation pin. Connect an external R-C network to GND to set loop compensation for system stability; abs-max -0.3V to +6V.
6	FB	input	Feedback pin. Regulated to 0.8V (typ). Connect a resistor divider from VOUT to FB to GND to program the output voltage (0.8V to VIN*0.85V); abs-max -0.3V to +6V.
7	SS	passive	Soft-start pin. Connect an external capacitor from SS to GND to set the soft-start ramp time; internal source current ~2.5 µA; abs-max -0.3V to +6V.
8	EN	input	Enable pin. Drive above ~1.2V (typ) to enable the regulator, below 0.4V to disable (shutdown). 200 mV of input hysteresis; abs-max -0.3V to +6V.
EPAD	VIN	power_in	Supply voltage pin, provided on the exposed thermal pad. Operating range 3.0V to 36V (abs-max 40V). Must be soldered to a PCB copper plane both for the input supply connection and for heat sinking.

Key specifications

Parameter	Value
Manufacturer	Alpha Omega Semicon
Package	SOIC-8-EP
Category	PMIC
Pins	9

Ordering variants

Same part, different packaging or reel option.

AOZ1284PI
AOZ1284PI-1

CAD (KiCad official)

Symbol: AOZ1284PI
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm
3D model: SOIC-8-EP (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`aoz1284pi.step`	125 KB	You want the bare part, or you mark your own boards.
`aoz1284pi-etched.step`	1.8 MB	You want the part with `AOZ1284PI` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 455 faces against 152 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: Alpha Omega Semicon datasheet (14 pp, sha256 d4c431a947220f9c, 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