TPS5420DR 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	Boost capacitor pin for the high-side FET gate driver. Connect a 0.01µF low-ESR ceramic capacitor from BOOT to PH to provide gate drive above VIN.
2	NC	unconnected	Not connected internally.
3	NC	unconnected	Not connected internally.
4	VSENSE	input	Feedback voltage input for the regulator error amplifier. Connect to the output voltage divider; regulates to VFB = 1.221V typical (adjustable output down to 1.22V).
5	ENA	input	Active-high enable / on-off control. Below 0.5V the device stops switching; above 1.3V the device starts switching. Internally pulled up via a 1.5MΩ resistor so the pin may be left floating; do not connect through a resistor to ground.
6	GND	power_in	Device ground return.
7	VIN	power_in	Input supply voltage, 5.5V to 36V (40V absolute max). Bypass with a high-quality low-ESR ceramic capacitor placed within 1mm of VIN and GND.
8	PH	power_out	Phase / switch node - source of the high-side power MOSFET. Connect to the external inductor and catch (Schottky) diode. Delivers up to 2A continuous (3A peak); on-resistance 110mΩ typical.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

TPS5420DR
TPS5420DRD

CAD (KiCad official)

Symbol: TPS5420DR
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
`tps5420dr.step`	122 KB	You want the bare part, or you mark your own boards.
`tps5420dr-etched.step`	2.0 MB	You want the part with `TPS5420DR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 506 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 cd667e69b40fa9c0, 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