LGS6305 from Legend Si, 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	output	Internal power switch node. Connects externally to the power inductor and the Schottky freewheeling diode (e.g. SS16). Absolute max VSW to GND: -0.3V to +60V. Peak current limit ILIMIT.SW(Peak) ≈ 460mA.
2	GND	power_in	Device ground / return pin.
3	VCC	power_out	5V LDO regulated output pin, rated 7mA (typical), with ~8mA short-circuit current limit. A 1uF-4.7uF ceramic decoupling capacitor must be placed between VCC and GND as close to the pin as possible. Can be used as a supply for external control circuitry.
4	EN	input	Enable / dimming input. Accepts a PWM dimming signal up to 10kHz. VEN_H ≥ 1.4V (enable), VEN_L ≤ 0.6V (disable). Absolute max to GND: -0.3V to +6V. Tie to VCC for always-on operation.
5	VIN	power_in	Input supply / current-sense high side. Connects to the LED current-sense resistor RSence (other side goes to CSN). Recommended operating range 12V-60V, absolute max -0.3V to +60V (transient up to 80V).
6	CSN	input	LED current-sense negative input. Connects to the low side of the external current-sense resistor RSence. Regulated VIN−VCSN ≈ 0.18V; output current IOUT = 0.18V / RSence. CSN bias current ~12uA. Absolute max: (VIN−6V) to (VIN+0.3V).

Key specifications

Parameter	Value
Manufacturer	Legend Si
Package	SOT-23-6
Category	LED-drv
Pins	6

Ordering variants

Same part, different packaging or reel option.

LGS6305

CAD (KiCad official)

Symbol: LGS6305
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: Legend Si datasheet (12 pp, sha256 0bbfc17627421303, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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