SY8745FCC

@@ -0,0 +1,50 @@+# SY8745FCC++**Silergy Corp** · LED Drivers · SOIC-8-EP++SY8745FCC from Silergy Corp, in a SOIC-8-EP. 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. Leave floating or tie to a copper pour per layout guidance. |+| 2 | CF | input | Dimming filter / reference capacitor pin. In analog dimming mode, connect a ~10nF capacitor to filter the reference. Also used to select the dimming mode: when VCF>1.5V the IC operates in PWM dimming mode; when VCF<1.5V it operates in analog dimming mode. Also sets soft-start time via CCF. |+| 3 | LX | output | Switching node / inductor connection. Internal low-side power MOSFET switches this node to GND. Connect the external output inductor from the power input side to LX. Absolute maximum 63V; keep LX copper area small to reduce EMI/noise. |+| 4 | GND | power_in | Ground pin. Also tied to the exposed thermal pad on the SO8E package. Provide a large copper area / ground plane for thermal and noise performance (ΘJA=30°C/W, θJC=10°C/W). |+| 5 | IN | power_in | Input supply pin (10-60V operating, 63V absolute max). Decouple this pin to GND with a 1µF (or larger) X7R ceramic capacitor placed close to IN/GND. Also serves as the positive terminal of the internal current sense (VIN-VSEN). |+| 6 | SEN | input | Negative current sense input. Connects to the LED-side of the external current sense resistor RSEN (RSEN = 0.1V / ILED). Typical current sense limit 100mV (VIN-VSEN). Recommended operating range is VIN ± 0.4V (absolute max VIN ± 0.6V). |+| 7 | EN | input | Enable and PWM dimming input pin. EN rising threshold 1.0V, falling 0.5V. If VEN>8V the IC operates in 0~1V linear (analog) dimming mode with the dimming signal applied to CF. If VEN<8V the IC works in PWM/analog dimming on EN (add a ~10nF cap to CF). Absolute max 63V; IC shuts down ~10ms after EN goes low. |+| 8 | NC | unconnected | No connection. Leave floating or tie to a copper pour per layout guidance. |+| EP | GND | power_in | Exposed thermal pad on the underside of the SO8E package, electrically tied to GND (pin 4). Solder to a large ground copper pour for thermal dissipation (PD=3.3W @ 25°C). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Silergy Corp |+| Package | SOIC-8-EP |+| Category | LED-drv |+| Pins | 9 |++## Ordering variants++Same part, different packaging or reel option.++- `SY8745FCC`++## CAD (KiCad official)++- Symbol: `SY8745FCC`+- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`+- 3D model: SOIC-8-EP (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Silergy Corp datasheet](docs/sy8745fcc-datasheet.pdf) (9 pp, sha256 `99a9efb6f89adc4a`, retrieved 2026-08-17, tier: manufacturer)+- **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/sy8745fcc-datasheet.pdf)

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