LM2674M-3.3

@@ -0,0 +1,47 @@+# LM2674M-3.3++**UMW** · DC-DC Converters · SOP-8++LM2674M-3.3 from UMW, 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 | CB | passive | Boost capacitance terminal. External bootstrap capacitor (typ. 10 nF / 103 50 V) connects between CB and VSW to develop the gate drive rail needed to fully enhance the internal high-side switch. |+| 2 | NC | unconnected | Empty port. No internal connection; leave floating or tie to a non-conducting net. |+| 3 | NC | unconnected | Empty port. No internal connection; leave floating or tie to a non-conducting net. |+| 4 | FB | input | Feedback control terminal. Senses the regulated output; for the fixed 3.3 V version this pin is tied directly to VOUT. Absolute rating: -0.3 V to VIN. |+| 5 | ON/OFF | input | Enable terminal with hysteresis: High = ON, Low = OFF. TTL-compatible shutdown input. VON(ON) min 1.5 V, VON(OFF) max 0.8 V; absolute range -0.3 V to 6 V. Shutdown current typ. 100 µA. |+| 6 | GND | power_in | Power supply ground terminal. Common return for the input supply, control circuitry, and internal power switch. |+| 7 | VIN | power_in | Positive terminal of power supply. Operating input voltage range 7 V-40 V, absolute maximum 45 V. Bypass locally with a 100 µF (typ.) input capacitor. |+| 8 | VSW | power_out | Power switch output terminal (SW). Connects to the external inductor and catch diode of the buck power stage. Absolute range -1 V to VIN. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | UMW |+| Package | SOP-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `LM2674M-3.3M-3.3`++## CAD (KiCad official)++- Symbol: `LM2674M-3.3`+- 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:** [UMW datasheet](docs/lm2674m-3-3-datasheet.pdf) (14 pp, sha256 `8da892f0ae83409e`, 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/lm2674m-3-3-datasheet.pdf)

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