TPS54331DR 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	output	Bootstrap capacitor node for the high-side MOSFET gate driver. A 0.1-µF capacitor is required between BOOT and PH. When the capacitor voltage falls below the minimum, the high-side MOSFET is forced off to refresh the bootstrap capacitor. Absolute max 38 V; BOOT-PH max 8 V.
2	VIN	power_in	Main input supply pin, 3.5 V to 28 V operating range (absolute max 30 V). Provides power to the internal high-side MOSFET and control circuitry.
3	EN	input	Enable input. Float to enable; pull below 1.25 V (typ threshold) to disable. Can be programmed with two resistors to set an input undervoltage lockout with hysteresis. Absolute max 6 V.
4	SS	input	Slow-start pin. An external capacitor to GND sets the output voltage rise time; internal charge current is 2 µA typ. Absolute max 3 V.
5	VSENSE	input	Inverting input to the internal transconductance (gm) error amplifier. Connect to the output feedback resistor divider; regulates to the internal 0.8-V reference (0.772-0.828 V). Absolute max 3 V.
6	COMP	output	Error-amplifier output and PWM comparator input. Connect the loop compensation network (typically an R-C series with an optional parallel C) here. Absolute max 3 V.
7	GND	power_in	Device ground pin and power return. On the DDA (PowerPAD) package the exposed PowerPAD must also be tied to GND for proper operation; on the D (SOIC) package this is the sole ground connection.
8	PH	output	Switch node - source of the internal high-side power MOSFET. Connect to the external Schottky rectifier and inductor. Rated for 3-A continuous, absolute max −0.6 V to 30 V (−5 V for 10-ns transients).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

TPS54331DR
TPS54331DRD
TPS54331DRDDAR
TPS54331DRDDA

CAD (KiCad official)

Symbol: TPS54331DR
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
`tps54331dr.step`	122 KB	You want the bare part, or you mark your own boards.
`tps54331dr-etched.step`	2.2 MB	You want the part with `TPS54331DR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 553 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 (41 pp, sha256 cf72dfd0ac69eec6, 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