# TMI3344

**TMI** · DC-DC Converters · ESOP-8

TMI3344 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 | passive | High-side gate driver bootstrap pin that supplies the high-side LDMOS gate driver, with a 100nF capacitor connected between BS and SW. |
| 2 | IN | power_in | Power input pin; the recommended input voltage range is 4.5V to 30V, and the input overvoltage protection threshold is typically 32V. |
| 3 | SW | output | Switch pin connected to the external inductor; the integrated high-side and low-side power MOSFETs drive this node. |
| 4 | GND | power_in | Ground pin for the device. |
| 5 | FB | input | Feedback pin that regulates the output against the 0.925V internal reference (±2% accuracy) via the external feedback divider. |
| 6 | COMP | passive | External compensation pin for the error amplifier output that feeds the peak current mode PWM comparator. |
| 7 | EN | input | Enable pin: logic-high enables the device and logic-low enters micro-power shutdown; it must not be left floating, has a 5V Zener clamp, and its sink current must stay below 1mA when pulled up through a resistor. |
| 8 | SS | passive | Soft-start and tracking pin; an external capacitor sets the soft-start time using the 2.6µA internal charge current, and the voltage on this pin overrides the internal reference. |
| 9 | GND | power_in | Ground exposed pad that should be connected to the power ground copper area with copper and vias for heat dissipation and noise immunity. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `TMI3344`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `tmi3344-etched.step` / `tmi3344-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tmi3344.step` / `tmi3344.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/8603098177046126592) (14 pp, sha256 `129a64be06632fa5`, 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/tmi3344-datasheet.pdf)