RY3730 from RYCHIP, 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	LX	output	Power switch output - drain of the internal NMOS boost switch. Connect the boost inductor and Schottky rectifier here. LX can swing between GND and 30V.
2	GND	power_in	Device ground. Connect to a solid ground plane for heat sinking and noise protection.
3	FB	input	Feedback input regulated to 0.25V (typ, 237-263mV). Connect the low side of the LED string current-sense resistor (R1 = 0.25V / ILED) to this pin. Input bias current is typically −10nA.
4	EN	input	Enable / PWM dimming control input. Logic high (>1V typ) enables the converter; logic low shuts it down (IIN < 1µA). Also accepts a PWM signal for LED brightness dimming; suggested PWM frequency ≥1kHz or ≤200Hz. Tie to VIN for automatic startup when unused.
5	OVP	input	Over-voltage protection sense input. Monitors the boost output for open-circuit / open-LED conditions; the converter stops switching when OVP reaches ~35V (typ). Connect to the top of the LED string / output rail.
6	IN	power_in	Input supply pin, 2.5V-5.5V. Must be locally bypassed with a ceramic capacitor (1µF X5R/X7R recommended) close to the pin.

Key specifications

Parameter	Value
Manufacturer	RYCHIP
Package	SOT-23-6
Category	LED-drv
Pins	6

Ordering variants

Same part, different packaging or reel option.

RY3730

CAD (KiCad official)

Symbol: RY3730
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
`ry3730.step`	97 KB	You want the bare part, or you mark your own boards.
`ry3730-etched.step`	1.5 MB	You want the part with `RY3730` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 364 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: RYCHIP datasheet (7 pp, sha256 b321309d15988426, 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