RY2121

@@ -0,0 +1,46 @@+# RY2121++**RYCHIP** · AC-DC Controllers and Regulators · SOT-23-5++RY2121 from RYCHIP, in a SOT-23-5. 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 | OUT | power_out | Switched power output. Delivers input voltage to the load through the internal 80mΩ MOSFET when EN is asserted. Discharged through an internal ~150Ω resistance during shutdown. |+| 2 | GND | power_in | Device ground reference. Also serves as the case position for θJC thermal measurement per the datasheet note. |+| 3 | SET | input | Current-limit programming pin. Connect a resistor RSET from this pin to GND to program the current-limit threshold (e.g. 6.8kΩ ≈ 1.18A typ; range 0.4A to 2A). |+| 4 | EN | input | Active-high ON/OFF control. Pull high (VIH ≥ 1.2V) to enable the switch; pull low (VIL ≤ 0.8V) to disable. Do not leave floating. ENB leakage ≤ 1μA at 5.5V. |+| 5 | IN | power_in | Power supply input, 2.4V to 5.5V. Source for the switched output through the internal power MOSFET. Monitored by the UVLO circuit (VIN_UVLO ≈ 2.3V with 0.1V hysteresis). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | RYCHIP |+| Package | SOT-23-5 |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++Same part, different packaging or reel option.++- `RY212170702013`++## CAD (KiCad official)++- Symbol: `RY2121`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [RYCHIP datasheet](docs/ry2121-datasheet.pdf) (9 pp, sha256 `15aeb628abbe0889`, 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](docs/ry2121-datasheet.pdf)

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