TPS54427DDAR from Texas Instruments, in a SOP-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	EN	input	Enable input control. Active high; must be pulled up to enable the device. VIH ≥ 1.6 V, VIL ≤ 0.6 V. Internal ~450 kΩ pull-down to GND (225-900 kΩ). Absolute max −0.3 to 20 V.
2	VFB	input	Converter feedback input. Connect to the output voltage via a resistor divider to set VOUT. Internal reference (VFBTH) is 765 mV typ (757-773 mV at 25 °C). Input current ±0.1 µA max.
3	VREG5	power_out	5.5 V internal LDO power supply output (5.2-5.7 V, up to 60 mA). Bypass with a ~1 µF capacitor to GND. Not active when EN is low. Also feeds internal gate drive.
4	SS	input	Soft-start control. Connect an external capacitor from SS to GND to program the soft-start ramp time. Absolute max −0.3 to 6.5 V.
5	GND	power_in	Ground pin. Power ground return for the switching circuit. Sensitive SS and VFB returns must be tied to GND at a single point.
6	SW	power_out	Switch node between the high-side NFET (drain of low-side, source of high-side). Connect to the output inductor. Absolute max −2 to 20 V (−3 to 22 V for 10 ns transients).
7	VBST	power_in	Bootstrap supply for the high-side FET gate driver. Connect a 0.1 µF capacitor between VBST and SW. An internal diode is connected between VREG5 and VBST for charging. VBST(vs SW) max 6 V.
8	VIN	power_in	Input voltage supply pin. Operating range 4.5 V to 18 V (absolute max 20 V). Bypass with ceramic capacitance close to the pin.
9	PowerPAD	power_in	Exposed thermal pad on the underside. Must be soldered to the PCB ground plane for proper thermal dissipation and must be electrically connected to GND.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOP-8
Category	PMIC
Pins	9

Ordering variants

Same part, different packaging or reel option.

TPS54427DDAR
TPS54427DDARDRC
TPS54427DDARDRCR

CAD (KiCad official)

Symbol: TPS54427DDAR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tps54427ddar.step`	123 KB	You want the bare part, or you mark your own boards.
`tps54427ddar-etched.step`	2.2 MB	You want the part with `TPS54427DDAR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 558 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 (32 pp, sha256 75b4634a9b5c2b51, 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