LM2664M6X from Texas Instruments, 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	GND	power_in	Power supply ground input. Return for the positive supply V+ and the charge-pump switching stage.
2	OUT	power_out	Negative voltage output. Produces -V+ (down to -5.5 V) with up to 40 mA load current; requires an external reservoir capacitor (typ. 3.3 uF, <=0.3 ohm ESR) to GND.
3	CAP-	passive	Negative terminal of the external flying (charge-pump) capacitor (typ. 3.3 uF, <=0.3 ohm ESR). Switched between V+ and OUT internally at fSW ~80 kHz.
4	SD	input	Shutdown control input. Tie to V+ (VIH >= 40% of V+, min 2 V) for normal operation; tie to GND (VIL <= 20% of V+, max 0.8 V) to enter shutdown (ISD ~1 uA). Absolute range GND-0.3 V to V++0.3 V.
5	V+	power_in	Positive supply input, 1.8 V to 5.5 V (absolute max 5.8 V). Quiescent current ~220 uA typical (500 uA max) with no load.
6	CAP+	passive	Positive terminal of the external flying (charge-pump) capacitor (typ. 3.3 uF, <=0.3 ohm ESR). Switched between V+ and GND internally.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

LM2664M6X

CAD (KiCad official)

Symbol: LM2664M6X
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lm2664m6x.step`	97 KB	You want the bare part, or you mark your own boards.
`lm2664m6x-etched.step`	1.8 MB	You want the part with `LM2664M6X` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 437 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 (20 pp, sha256 49d43b3879282bf8, 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