# TMI3494

**TMI** · DC-DC Converters · ESOP-8

TMI3494 from TMI, in a ESOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BS | power_out | High-side gate driver bootstrap pin that supplies the high-side LDMOS gate driver; connect a 0.1µF capacitor between BS and SW. |
| 2 | IN | power_in | Power input pin; the recommended operating input voltage range is 5 V to 40 V. |
| 3 | SW | output | Switch pin that connects to the external inductor; the absolute maximum input supply voltage on SW is -0.3 V to 45 V. |
| 4 | GND | power_in | Ground pin. |
| 5 | FB | input | Feedback pin that regulates to the internal 0.92 V reference (VFBTH 902 mV to 938 mV), with output voltage set by an external resistor divider. |
| 6 | COMP | passive | External compensation pin for the control loop. |
| 7 | ISET | passive | Current limit set pin; the output current limit is set by a resistor from ISET to GND, with a recommended RISET not smaller than 200 kΩ. |
| 8 | EN | input | Active-low enable pin: drive below 0.4 V to enable the regulator and above 1.4 V to turn it off; do not leave it floating. |
| 9 | GND | power_in | Ground exposed pad that should be connected to the power ground copper area with copper and vias. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TMI |
| Package | ESOP-8 |
| Category | Power Management (PMIC) |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `TMI3494`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `tmi3494-etched.step` / `tmi3494-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tmi3494.step` / `tmi3494.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590904612515885056) (14 pp, sha256 `7827b6ef2b8d5442`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tmi3494-datasheet.pdf)