component

LGS63040B5

Public Made by Adom

by adom

Legend Si LED Drivers, SOT-23-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs lgs63040b5: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
lgs63040b5-etched.fit.json lgs63040b5: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lgs63040b5-etched.glb lgs63040b5: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lgs63040b5-etched.step lgs63040b5: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lgs63040b5.glb Publish 0.1.0 · Ray
lgs63040b5.kicad_mod Publish 0.1.0 · Ray
lgs63040b5.kicad_sym Publish 0.1.0 · Ray
lgs63040b5.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
lgs63040b5.step Publish 0.1.0 · Ray
package.json Publish 0.2.0 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json lgs63040b5: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray
README.md lgs63040b5: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

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

Same part, different packaging or reel option.

  • LGS63040B5
  • LGS63040B5EP

CAD (KiCad official)

  • Symbol: LGS63040B5
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: lgs63040b5-etched.step / lgs63040b5-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lgs63040b5.step / lgs63040b5.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lgs63040b5.step 85 KB You want the bare part, or you mark your own boards.
lgs63040b5-etched.step 2.4 MB You want the part with LGS63040B5 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 566 faces against 102 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Legend Si datasheet (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