component

ry9121

Public Made by Adom

by adom

RYCHIP DC-DC Converters, SOT-23-6. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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README

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RY9121

RYCHIP · DC-DC Converters · SOT-23-6

RY9121 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 pin for the high-side MOSFET gate driver. A bootstrap capacitor (typ. 100nF) connected between SW and BS forms a floating supply across the high-side switch driver.
2 GND power_in Ground reference pin. Return path for both signal and power currents; should be connected to a large copper area for thermal dissipation.
3 FB input Adjustable version feedback input to the internal error amplifier. Connect to the center tap of an external resistor divider from VOUT; internal reference is 0.6V (typ., 0.585V-0.615V). Absolute max −0.3V to 6V.
4 EN input Enable input. Drive high (V_EN rising threshold ≥ 1.4V) to enable the IC; drive low (V_EN falling ≤ 0.8V) to disable and enter micro-power shutdown (~4µA). Absolute max −0.3V to 18V.
5 IN power_in Power supply input pin. Operating range 4.5V to 17V (absolute max 18V). Requires a local ceramic bypass capacitor (X5R/X7R) placed as close to the pin as possible.
6 SW power_out Switching node connected to the source of the high-side MOSFET and drain of the low-side MOSFET. Connect to the external inductor and to the bootstrap capacitor. Absolute max −0.3V to V_IN+0.5V.

Key specifications

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

Ordering variants

  • RY912170301121

CAD (KiCad official)

  • Symbol: RY9121
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)
  • 3D model files: ry9121-etched.step / ry9121-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ry9121.step / ry9121.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: RYCHIP datasheet (None pp, sha256 3773fded2bea4379, 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

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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