LM1938SF6 from HTC Korea TAEJIN Tech, in a SOT-23-6L. 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	Switching Pin. Collector of the internal NPN power switch (36V rated, 650mA current limit). Connect to the boost inductor and Schottky diode. Minimize metal trace area at this node to reduce EMI.
2	GND	power_in	Ground Pin. Connect directly to the local ground plane. Return for both the power switch emitter and the internal control circuitry.
3	FB	input	Feedback Pin. Regulated to an internal reference of 95mV (typ; 86-104mV). Connect the LED string(s) and a current-set resistor at this pin so ILED = 95mV / Rset. FB bias current is ~45nA typ (100nA max).
4	/SHDN	input	Active-low shutdown enable pin. Drive to 1.5V or higher to enable the device; 0.4V or less disables it. Shutdown supply current drops to ~0.1uA. Pin bias current ~65uA when active.
5	OVP	input	Over-Voltage Protection sense pin. Threshold is 29V typ. Limits the output voltage when the LED load is disconnected or open, preventing the SW node from exceeding the 36V rating.
6	VIN	power_in	Input Supply Pin. Operating range 2.5V (min) to 10V (max). Bypass this pin with a capacitor (typ 4.7uF ceramic) as close to the device as possible.

Key specifications

Parameter	Value
Manufacturer	HTC Korea TAEJIN Tech
Package	SOT-23-6L
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

LM1938SF6

CAD (KiCad official)

Symbol: LM1938SF6
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6L (KiCad packages3D, STEP)

Provenance

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

Datasheet: HTC Korea TAEJIN Tech datasheet (16 pp, sha256 fd6507f70a35453e, 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