TPS54231DR from Texas Instruments, in a SOIC-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	BOOT	passive	Bootstrap capacitor node for the high-side MOSFET gate drive. A 0.1-µF capacitor is required between BOOT and PH. If the BOOT-PH voltage falls below the minimum requirement, the high-side MOSFET switches off until the capacitor is refreshed. BOOT abs max 38 V; BOOT-PH abs max 8 V.
2	VIN	power_in	Input supply voltage pin, 3.5 V to 28 V operating range. Absolute maximum 30 V. Provides power to the internal high-side MOSFET and controller.
3	EN	input	Enable input. Pull below 1.25 V to disable the device; float to enable. Can be programmed with two external resistors to set the input UVLO threshold. Enable threshold typ 1.25 V, max 1.35 V; abs max 6 V.
4	SS	passive	Slow-start pin. An external capacitor to GND sets the output voltage rise time during startup. Charge current typ 2 µA; SS-to-VSENSE matching 10 mV; abs max 3 V.
5	VSENSE	input	Inverting input of the transconductance (gm) error amplifier. Connects to the external resistor divider from VOUT to program the output voltage. Internal reference 0.8 V (0.772/0.828 V min/max). Abs max 3 V.
6	COMP	output	Error-amplifier output and PWM comparator input. External frequency compensation network (R/C) connects here to shape the loop response. Abs max 3 V.
7	GND	power_in	Device ground return for internal circuitry and power stage.
8	PH	power_out	Switch node - source of the internal high-side power MOSFET. Connects to the external inductor and catch diode. Rated to 2-A continuous output current; PH abs max 30 V (−0.6 V DC, −5 V for 10-ns transient).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

TPS54231DR
TPS54231DRD

CAD (KiCad official)

Symbol: TPS54231DR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tps54231dr.step`	122 KB	You want the bare part, or you mark your own boards.
`tps54231dr-etched.step`	2.2 MB	You want the part with `TPS54231DR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 537 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 (35 pp, sha256 401b0451b9771a05, 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