U3018F

@@ -0,0 +1,47 @@+# U3018F++**UNI SEMIC** · DC-DC Converters · SOP-8++U3018F from UNI SEMIC, in a SOP-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 | NC | unconnected | No connection. Recommended to leave floating. |+| 2 | FB | input | Voltage feedback input pin. When left floating, the chip defaults to a 14.3V output; for adjustable output, connect a resistor divider from the output to this pin (internal reference V_FB_REF ≈ 2.0V). |+| 3 | Drain | passive | Drain of the internal high-voltage power MOSFET (V_BR ≈ 190V, R_dson ≈ 1.15Ω). Also used for high-voltage startup current sensing (I_HV ≈ 1-4mA at HV=150V). Absolute maximum drain voltage: -0.3 to 190V. |+| 4 | SW | passive | Switch node / internal MOSFET source. Pins 4 and 7 must be shorted together in the application (they form the chip ground/switch node connection per the datasheet). |+| 5 | VF | input | Default 14.3V feedback pin. Used for output over-voltage protection sensing; when VF > 2.4V for 3 consecutive cycles the chip enters OVP and auto-restart mode. |+| 6 | VDD | power_in | Chip supply pin, also serves as an output voltage feedback terminal. A 0.1µF ceramic decoupling capacitor is recommended. V_DD_OVP ≈ 24V, V_DD_Clamp ≈ 26V @ 10mA, absolute max 30V. Startup current I_VDD_st ≈ 100µA, operating current I_VDD_Op ≈ 800µA @ 60kHz. |+| 7 | SW | passive | Switch node / internal MOSFET source. Pins 4 and 7 must be shorted together in the application. |+| 8 | GND | power_in | Ground reference for the chip. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | UNI SEMIC |+| Package | SOP-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `U3018F`++## CAD (KiCad official)++- Symbol: `U3018F`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [UNI SEMIC datasheet](docs/u3018f-datasheet.pdf) (11 pp, sha256 `0c971a087292f446`, 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/u3018f-datasheet.pdf)

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