component
TMI3258
Public Unreviewedby Ray
TMI DC-DC Converters, SOT-563. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownTMI3258
TMI · DC-DC Converters · SOT-563
TMI3258 from TMI, in a SOT-563. 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 | IN | power_in | Power supply input pin. Accepts 4.5V to 18V (absolute max 20V). Bypass with a low-ESR ceramic capacitor placed close to the pin to minimize the switching loop area with GND. |
| 2 | LX | output | Switching node output. Connects internally to the source of the high-side MOSFET and the drain of the low-side MOSFET; drives the external inductor. Absolute max -0.3V to 20V (transient -4.5V to 22V for <10ns). |
| 3 | GND | power_in | Ground reference for the IC. Should be connected to a large copper area for thermal dissipation and to keep the input-current switching loop tight. |
| 4 | BS | power_in | Bootstrap pin. A capacitor (typically 0.1µF, often with a small series resistor 0Ω-10Ω) is connected between LX and BS to form a floating supply for the high-side switch gate driver. Absolute max -0.3V to 23V. |
| 5 | EN | input | Enable input. Drive logic-high (rising threshold typ 0.95V) to enable the IC; drive logic-low (falling threshold typ 0.77V) for micro-power shutdown (typ 5µA). Do not leave floating. Shares the input-supply absolute max of 20V. |
| 6 | FB | input | Output voltage feedback input. Connect to the midpoint of the external resistor divider from VOUT to GND. Regulated to VREF = 0.807V (0.791-0.823V). Absolute max -0.3V to 6V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | TMI |
| Package | SOT-563 |
| Category | PMIC |
| Pins | 6 |
Ordering variants
Same part, different packaging or reel option.
TMI3258
CAD (KiCad official)
- Symbol:
TMI3258 - Footprint:
Package_TO_SOT_SMD:SOT-563 - 3D model: SOT-563 (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
tmi3258.step |
448 KB | You want the bare part, or you mark your own boards. |
tmi3258-etched.step |
1.7 MB | You want the part with TMI3258 already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 351 faces against 54 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 (15 pp, sha256
1a6db88e2cb40292, 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).