# TMI3255SF

**TMI** · DC-DC Converters · SOT-23-6

TMI3255SF from TMI, in a SOT-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 | FB | input | Output voltage feedback input. Connect FB to the center point of the external resistor divider. Regulated feedback voltage is 0.6V (±1.5%). FB input leakage is ±0.5µA max. |
| 2 | EN | input | Enable input. Drive high (>1.05V typ, 1.20V max) to enable the IC; drive low (<0.90V) to disable and enter micro-power shutdown mode. Do not float EN. Max input rating 20V; 120mV hysteresis; 300µs enable delay. |
| 3 | GND | power_in | Ground pin. Return for the low-side MOSFET and all internal circuitry. Connect to a large copper area for thermal performance. |
| 4 | IN | power_in | Power supply input pin. Accepts 4.5V to 18V (20V absolute max). Bypass with a ceramic capacitor placed close to the pin. OVP threshold ~19V typ. |
| 5 | LX | power_out | Switching node. Connect to the external inductor. Internal high-side and low-side MOSFETs switch this node between IN and GND. Absolute max -0.3V to 20V (-4.5V to 22V for <10ns transients). |
| 6 | BS | passive | Bootstrap pin. A capacitor (typ 0.1µF) connected between BS and LX forms a floating supply for the high-side MOSFET gate driver. Absolute max 23V referenced to GND. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TMI |
| Package | SOT-23-6 |
| Category | PMIC |
| Pins | 6 |

## Ordering variants

Same part, different packaging or reel option.

- `TMI3255SF`

## CAD (KiCad official)

- Symbol: `TMI3255SF`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `tmi3255sf-etched.step` / `tmi3255sf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tmi3255sf.step` / `tmi3255sf.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [TMI datasheet](docs/tmi3255sf-datasheet.pdf) (14 pp, sha256 `6f4c0c6a566eb888`, 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](docs/tmi3255sf-datasheet.pdf)