OC5022B from OCX, in a ESOP-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	GND	power_in	Device ground return. Connect directly to the current-sense resistor RCS ground node with a short, wide trace to preserve output-current accuracy.
2	NC	unconnected	No connect. Leave floating (悬空不接).
3	DIM	input	Dimming control input supporting both PWM and linear (analog) dimming. Pulling DIM to GND shuts off the LED output; DIM > 3.1V gives 100% output current. Linear dimming range is 1.1V-3.1V (shutdown threshold ~0.9V). Must not be left floating; tie high when unused, and add a small (>=10nF) cap to GND when using linear dimming.
4	SW	output	Switch node; drain of the internal 60V power MOSFET (RDSON ~70mOhm at VGS=5V). Connect to the inductor and freewheel diode of the buck stage. The ESOP-8 exposed pad is internally tied to SW.
5	CS	input	Inductor peak-current sense input. Trips at VCS_TH = 245-265mV (typ. 255mV) across the external RCS sense resistor to terminate the on-time. Pins 5 and 6 are internally tied together; use a short, wide Kelvin connection to RCS.
6	CS	input	Inductor peak-current sense input (paralleled with pin 5). Connect together with pin 5 to the RCS/inductor return node.
7	TOFF	input	Off-time programming pin. An external capacitor COFF to GND sets TOFF = 0.51 * 150kOhm * (COFF + 8pF) + 61ns. With no capacitor the internal minimum TOFF is ~650ns.
8	VDD	power_in	Chip supply, internally clamped by a Zener to ~5.5V (max Zener sink current 10mA). Powered from VIN through a dropping resistor RVDD = (VIN - 5.5V) / IVDD (IVDD typ 2mA). UVLO releases at ~2.6V rising with 0.4V hysteresis.

Key specifications

Parameter	Value
Manufacturer	OCX
Package	ESOP-8
Category	LED-drv
Pins	8

CAD (KiCad official)

Symbol: OC5022B
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm
3D model: ESOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`oc5022b.step`	193 KB	You want the bare part, or you mark your own boards.
`oc5022b-etched.step`	1.6 MB	You want the part with `OC5022B` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 385 faces against 63 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: OCX datasheet (7 pp, sha256 450ce8ff55ea9080, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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