RY9131 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	BS	passive	Bootstrap. A capacitor connected between SW and BS pins forms a floating supply across the high-side switch driver. Absolute max BS voltage is Vsw+5V.
2	GND	power_in	Ground pin. Common return for the IC and the low-side power MOSFET.
3	FB	input	Adjustable version feedback input. Connect FB to the center point of the external resistor divider that sets VOUT via VOUT = VFB × (R1+R2)/R2, where VFB = 0.6V typical. Absolute max FB voltage is 6V.
4	EN	input	Enable input. Drive high (≥1.4V typ.) to enable the IC; drive low (≤0.8V typ.) to disable and enter micro-power shutdown mode. Absolute max EN voltage is 18V.
5	IN	power_in	Power supply input. Operating range 4.5V to 17V; absolute max 18V. Bypass with a ceramic capacitor placed as close as possible to this pin.
6	SW	power_out	Switching node. Connects to the external inductor. Internal high-side (70mΩ) and low-side (50mΩ) MOSFETs switch this node between IN and GND. Absolute max SW voltage is VIN+0.5V.

Key specifications

Parameter	Value
Manufacturer	RYCHIP
Package	SOT-23-6
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

RY9131ECYLL

CAD (KiCad official)

Symbol: RY9131
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
`ry9131.step`	97 KB	You want the bare part, or you mark your own boards.
`ry9131-etched.step`	1.3 MB	You want the part with `RY9131` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 336 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 (13 pp, sha256 8e57144f069ec4a8, 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