UM1663S

@@ -0,0 +1,41 @@+# UM1663S++**Union Semiconductor** · DC-DC Converters · SOT-23-6++UM1663S from Union Semiconductor, in a SOT-23-6. 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 | SW | power_out | Switch pin. Connect the boost inductor and Schottky diode to this pin. Internal NMOS power switch rated to 40V max (Vsw), 1A current limit (typical), Rds(on) ~550 mOhm. |+| 2 | GND | power_in | Ground / power ground. Datasheet symbol listed as GND/PGND; single ground return for the device and internal power switch. |+| 3 | FB | input | Feedback voltage pin. Regulated to 200mV internal reference (Vref 190-210mV) via an external sense resistor to set LED current. Duty-cycle on SHDN modulates the effective feedback reference for dimming. |+| 4 | SHDN | input | Active-low chip enable and single-wire PWM/Pulse-mode dimming input. VIH >=1.5V (Vcc=3.7V) / >=1.8V (Vcc=5V); VIL <=0.6V/0.8V. Initial pulse >=2ms selects PWM dimming (500Hz-50kHz); initial pulse <=1.5ms selects 64-step Pulse dimming. Logic low >20ms shuts the device down. |+| 5 | OVP | input | Overvoltage protection sense pin. Connect to the boost output capacitor; the chip clamps output when the pin exceeds the internal threshold. Default OVP threshold is 38V (spec typ 36V). |+| 6 | VIN | power_in | Supply voltage pin. Operating range 2.8V to 5.5V; absolute max -0.3V to +6V. Bypass with a local ceramic capacitor (typ 10uF). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Union Semiconductor |+| Package | SOT-23-6 |+| Category | PMIC |+| Pins | 6 |++## CAD (KiCad official)++- Symbol: `UM1663S`+- Footprint: `Package_TO_SOT_SMD:SOT-23-6`+- 3D model: SOT-23-6 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Union Semiconductor datasheet](docs/um1663s-datasheet.pdf) (16 pp, sha256 `da01582bb6963f3e`, 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/um1663s-datasheet.pdf)

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