TMI3253SH from TMI, in a TSOT-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	BS	passive	Bootstrap pin. A capacitor (typ. 0.1µF) connected between LX and BS forms a floating supply for the high-side switch driver. Absolute max: -0.3V to 23V.
2	GND	power_in	Ground pin. Return for all internal circuitry and the low-side power MOSFET source.
3	FB	input	Output voltage feedback input. Connect to the center point of the external resistor divider from VOUT to GND. Regulated to internal VREF = 0.6V (typ., 0.588V-0.612V). Absolute max: -0.3V to 6V.
4	EN	input	Enable input. Drive logic-high (≥1.5V) to enable the IC; drive logic-low (≤0.3V) to disable and enter micro-power shutdown (~5µA). Do not leave floating. Shares absolute max with input supply (-0.3V to 20V).
5	IN	power_in	Power supply input. Operating range 4.5V to 18V; OVP threshold typ. 19.3V. Bypass to GND with a low-ESR ceramic capacitor close to the pin.
6	LX	output	Switching node. Connection to the drains of the internal high-side and low-side power MOSFETs; drives the external inductor. Absolute max: -0.3V to 20V.

Key specifications

Parameter	Value
Manufacturer	TMI
Package	TSOT-23-6
Category	PMIC
Pins	6

CAD (KiCad official)

Symbol: TMI3253SH
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: TSOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tmi3253sh.step`	97 KB	You want the bare part, or you mark your own boards.
`tmi3253sh-etched.step`	1.9 MB	You want the part with `TMI3253SH` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 472 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: TMI datasheet (14 pp, sha256 91d79790ad36d892, retrieved 2026-08-17, tier: lcsc)
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