LGS63040B5

@@ -0,0 +1,45 @@+# LGS63040B5++**Legend Si** · LED Drivers · SOT-23-5++LGS63040B5 from Legend Si, in a SOT-23-5. 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 | output | Internal power switch node (drain of the 350mΩ low-side NMOS). Externally connected to the power inductor and Schottky freewheeling diode. High dv/dt node - keep copper area small to limit EMI. |+| 2 | GND | power_in | Device ground reference. Tie to a large ground pour for thermal and return-current path. |+| 3 | EN | input | Enable / dimming input. Digital high (>0.5V) enables the regulator; low (<0.4V) shuts it down. On LGS63040 accepts an analog voltage 0.6V-1.2V for analog dimming of LED current; on LGS63042 accepts a 100Hz-100kHz PWM square wave for PWM dimming. Internal 800kΩ pull-down; do not leave floating. Absolute max 6V. |+| 4 | CSN | input | LED current sense input. Connect to the LED-side node of the external sampling resistor R_Sence. Output current is set by I_OUT = (V_OUT(VIN) − V_CSN) / R_Sence, with typical V_OUT−V_CSN = 0.2V (0.195V-0.205V). High-impedance node - route short and away from SW. |+| 5 | VIN/OUT | power_in | Combined input supply pin and output-voltage sense point. Also the VIN-side terminal of the external LED current sampling resistor R_Sence. Serves as input-voltage detection in buck mode and as output-voltage connection in boost / buck-boost mode. Operating range 3.0V-60V (abs max 60V). Bypass with 4.7µF/100V X7R or X5R ceramic near the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Legend Si |+| Package | SOT-23-5 |+| Category | LED-drv |+| Pins | 5 |++## Ordering variants++- `LGS63040B5B5`+- `LGS63040B5EP`++## CAD (KiCad official)++- Symbol: `LGS63040B5`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Legend Si datasheet](docs/lgs63040b5-datasheet.pdf) (22 pp, sha256 `13f24f98441db88d`, 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/lgs63040b5-datasheet.pdf)

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