XL1509-3.3

@@ -0,0 +1,48 @@+# XL1509-3.3++**UMW** · DC-DC Converters · SOP-8++XL1509-3.3 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 | VIN | power_in | Supply Voltage Input Pin. Operates from 4.5V to 40V DC (absolute max 45V). Bypass VIN to GND with a suitably large capacitor to eliminate input-line noise. |+| 2 | OUTPUT | output | Power Switch Output Pin (SW). Switch node connecting the internal power transistor's emitter to the external inductor and Schottky catch diode; delivers up to 2A of switched current at 150 kHz. |+| 3 | FEEDBACK | input | Feedback Pin (FB). For fixed-output versions (3.3V here), tie directly to the regulated output; internal divider senses against the 1.23V reference. Absolute max: -0.3 to VIN. |+| 4 | ON/OFF | input | Enable Pin. Drive low (<0.8V) to turn the regulator ON, drive high (>1.4V) to turn it OFF. Floating defaults low (ON). Shutdown supply current typ. 80 µA. |+| 5 | GND | power_in | Ground pin. Should be placed outside the Schottky diode to output capacitor ground path to prevent switching-current spikes from inducing voltage noise into the IC. Pins 5, 6, 7, 8 are all GND and should be tied together. |+| 6 | GND | power_in | Ground pin (see pin 5). Tie all four GND pins to a solid ground plane for current return and thermal dissipation. |+| 7 | GND | power_in | Ground pin (see pin 5). Tie all four GND pins to a solid ground plane for current return and thermal dissipation. |+| 8 | GND | power_in | Ground pin (see pin 5). Tie all four GND pins to a solid ground plane for current return and thermal dissipation. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | UMW |+| Package | SOP-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `XL1509-3.3`+- `XL1509-3.3XL1509E-3.3`++## CAD (KiCad official)++- Symbol: `XL1509-3.3`+- 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/xl1509-3-3-datasheet.pdf) (15 pp, sha256 `bd5713838034a224`, 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/xl1509-3-3-datasheet.pdf)

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