component

LGS63042B5

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by Ray

Legend Si LED Drivers, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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LGS63042B5

Legend Si · LED Drivers · SOT-23-5

LGS63042B5 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 internal 350mΩ low-side MOSFET). Externally connected to the power inductor and Schottky diode. Absolute max voltage to GND: -0.3V to 60V. Peak current limit typ. 1.7A (max 2.1A).
2 GND power_in Device ground reference for control and power return.
3 EN input Enable / dimming input pin. On the 63042 variant this accepts a digital PWM square wave (100Hz to 100kHz) for dimming; rising-edge threshold 0.31-0.54V (typ 0.5V), falling-edge threshold 0.25-0.38V (typ 0.35V). Absolute max to GND: -0.3V to 6V. Internal ~800kΩ pull-down; do not leave floating.
4 CSN input LED current sense pin. Connects to the LED-side terminal of the external sampling resistor R_Sence. Output current is set by I_OUT = (V_OUT(VIN) − V_CSN) / R_Sence, with V_OUT(VIN)−V_CSN typ. 0.2V (range 0.195-0.205V). Absolute max to GND: VIN−6V to VIN+0.3V.
5 VIN/OUT power_in Combined input supply / output-voltage sense pin. Connects the LED current-sampling resistor to the CSN end. Acts as the input voltage supply/sense node in buck mode and as the output voltage sense node in boost/buck-boost applications. Operating range 3.0V to 60V; absolute max to GND -0.3V to 60V. Decouple with a 4.7µF/100V ceramic (X5R/X7R).

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.

  • LGS63042B5
  • LGS63042B5EP

CAD (KiCad official)

  • Symbol: LGS63042B5
  • 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 (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