XL1509-5.0

@@ -0,0 +1,48 @@+# XL1509-5.0++**Unknown** · DC-DC Converters · SOIC-8++XL1509-5.0 from Unknown, in a SOIC-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. Operates from 4.5 V to 40 V DC (absolute max 45 V). Bypass to GND with a large-value low-ESR capacitor (e.g. 470 uF/35 V CIN + 1 uF ceramic) placed close to the pin to eliminate input switching noise. |+| 2 | OUTPUT | output | Power switch output (SW node). Internal high-side switch connects VIN to this pin during on-time; the external Schottky catch diode (e.g. 1N5820) and inductor form the buck power stage. Saturation voltage ~1.2 V typ at 2 A. |+| 3 | FEEDBACK | input | Feedback (FB) sense input. For fixed 5.0 V version this pin is tied to the regulated output; the internal reference is 1.23 V and the fixed-output divider is set on-die. Absolute max -0.3 V to VIN. |+| 4 | ON/OFF | input | Enable pin, TTL-compatible with hysteresis. Drive low (<0.8 V) to enable the regulator, high (>1.4 V) to shut it down (~80 uA standby). Floating is default low (enabled). Absolute max -0.3 V to VIN. |+| 5 | GND | power_in | Ground return. Pins 5, 6, 7, 8 are all GND and should be tied to a solid ground plane; on ESOP-8 the exposed pad also serves as thermal ground. |+| 6 | GND | power_in | Ground return. Tie to the same ground plane as pins 5/7/8. Keep this path outside the Schottky-diode-to-output-cap ground loop to avoid switching noise injection. |+| 7 | GND | power_in | Ground return. Tie to the same ground plane as pins 5/6/8. Keep this path outside the Schottky-diode-to-output-cap ground loop to avoid switching noise injection. |+| 8 | GND | power_in | Ground return. Tie to the same ground plane as pins 5/6/7. Keep this path outside the Schottky-diode-to-output-cap ground loop to avoid switching noise injection. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Unknown |+| Package | SOIC-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `XL1509-5.0`+- `XL1509-5.0E`++## CAD (KiCad official)++- Symbol: `XL1509-5.0`+- 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:** [Unknown datasheet](docs/xl1509-5-0-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/xl1509-5-0-datasheet.pdf)

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