LM5050MKX-1 from Texas Instruments, in a TSOT-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	VS	power_in	Main supply pin for all internal biasing and auxiliary supply for the internal gate-drive charge pump. Typically connected to VOUT or VIN; a separate supply may also be used. Operating range 5 V to 75 V (abs max 100 V).
2	GND	power_in	Ground return for the controller.
3	OFF	input	Shutdown input. A logic-high state pulls GATE low and turns off the external MOSFET (note: body-diode current still flows). VOFF(IH) typ 1.56 V, VOFF(IL) typ 1.4 V, abs max 7 V. May be left open or tied to GND if unused (5 uA internal pulldown).
4	IN	input	Voltage-sense connection to the external MOSFET source pin (upstream side). Used together with OUT for the reverse-current comparator. Operating range 5 V to 75 V.
5	GATE	output	Charge-pump gate-drive output for the external N-channel MOSFET. Regulates VGS to emulate a low forward-voltage diode; sinks up to 2.8 A (typ) during fast turn-off. Typically 12 V above IN when enabled.
6	OUT	input	Voltage-sense connection to the external MOSFET drain pin (downstream side). Used with IN to detect forward/reverse current for the OR-ing comparator. Operating range 5 V to 75 V.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TSOT-23-6
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

LM5050MKX-1
LM5050MKX-1MK-1
LM5050MKX-1Q0MK-1
LM5050MKX-1Q1MK-1

CAD (KiCad official)

Symbol: LM5050MKX-1
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: TSOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lm5050mkx-1.step`	97 KB	You want the bare part, or you mark your own boards.
`lm5050mkx-1-etched.step`	1.8 MB	You want the part with `LM5050MKX-1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 465 faces against 117 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: Texas Instruments datasheet (30 pp, sha256 4fc143ccdc6509a8, 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