XL1509-ADJ

@@ -0,0 +1,48 @@+# XL1509-ADJ++**UMW Youtai Semiconductor Co   Ltd** · DC-DC Converters · SOIC-8++XL1509-ADJ from UMW Youtai Semiconductor Co   Ltd, in a SOIC-8. Pinout and pin descriptions extracted from the datasheet (via LCSC) 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 a 4.5 V to 40 V DC supply (absolute max 45 V). Bypass VIN to GND with a suitably large capacitor (e.g. 470 uF/35 V in the typical application) to eliminate input noise. |+| 2 | OUTPUT | output | Power Switch Output Pin (SW). Internal power transistor switch node that supplies power to the external inductor/Schottky diode network driving the output. Rated -0.3 V to VIN. |+| 3 | FEEDBACK | input | Feedback Pin (FB). Through an external resistor divider network, FEEDBACK senses the output voltage and regulates it. The internal feedback threshold voltage is 1.23 V. Rated -0.3 V to VIN. |+| 4 | ON/OFF | input | Enable Pin with hysteresis. Drive ON/OFF low (TTL) to turn on the device; drive high to turn it off. Floating defaults to low (device ON). Rated -0.3 V to VIN. |+| 5 | GND | power_in | Ground Pin. Care must be taken in layout: this pin should be placed outside of the Schottky diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into XL1509. Pins 5, 6, 7, 8 are all GND. |+| 6 | GND | power_in | Ground Pin. Care must be taken in layout: this pin should be placed outside of the Schottky diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into XL1509. Pins 5, 6, 7, 8 are all GND. |+| 7 | GND | power_in | Ground Pin. Care must be taken in layout: this pin should be placed outside of the Schottky diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into XL1509. Pins 5, 6, 7, 8 are all GND. |+| 8 | GND | power_in | Ground Pin. Care must be taken in layout: this pin should be placed outside of the Schottky diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into XL1509. Pins 5, 6, 7, 8 are all GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | UMW Youtai Semiconductor Co   Ltd |+| Package | SOIC-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `XL1509-ADJUMW XL1509-ADJ`+- `XL1509-ADJUMW XL1509E-ADJ`++## CAD (KiCad official)++- Symbol: `XL1509-ADJ`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [UMW Youtai Semiconductor Co   Ltd datasheet](https://datasheet.lcsc.com/datasheet/pdf/8fc40f471ce8861475100e80d7a27e4e.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-adj-datasheet.pdf)

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