LM3489MMX from Texas Instruments, in a VSSOP-8. 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	ISENSE	input	Current sense input. Connects to the external PFET drain terminal directly or through a series resistor up to 600 Ω for 28 V > VIN > 35 V. Used with ADJ to set the cycle-by-cycle current limit.
2	GND	power_in	Signal ground reference for the controller's internal circuitry.
3	EN	input	Enable pin. Tie EN to ground to shut down the device, or float to enable (internally pulled high, clamped at ~8 V typical). Can also be used to implement a UVLO function. Enable rising threshold typ 1.5 V, hysteresis 130 mV.
4	FB	input	Feedback input. Connect FB to a resistor voltage divider between the regulated output and GND to set the adjustable output voltage. Internal reference VFB = 1.239 V typical.
5	ADJ	input	Current limit threshold adjustment. Connected to an internal 5.5-µA current source; a resistor between ADJ and VIN sets a reference voltage that is compared with the ISENSE pin voltage to detect an overcurrent condition.
6	PGND	power_in	Power ground return for the PFET gate driver output stage.
7	PGATE	output	Gate drive output for the external PFET. PGATE swings between VIN and (VIN − 5 V). Driver source resistance ~5.5 Ω, sink ~8.5 Ω; peak source current ~0.44 A.
8	VIN	power_in	Power supply input pin. Operating range 4.5 V to 35 V (absolute max 36 V).

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	VSSOP-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

LM3489MMX
LM3489MMXQMM
LM3489MMXQMMX

CAD (KiCad official)

Symbol: LM3489MMX
Footprint: Package_SO:VSSOP-8_2.3x2mm_P0.5mm
3D model: VSSOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lm3489mmx.step`	122 KB	You want the bare part, or you mark your own boards.
`lm3489mmx-etched.step`	1.9 MB	You want the part with `LM3489MMX` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 476 faces against 147 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 (27 pp, sha256 8efdf3c39fd516a0, retrieved 2026-08-17, tier: manufacturer)
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