# LM3671QMF-1.2

**Texas Instruments** · DC-DC Converters · SOT-23-5

LM3671QMF-1.2 from Texas Instruments, in a SOT-23-5. 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 | VIN | power_in | Power supply input that connects to the input filter capacitor; the datasheet gives a 2.7 V to 5.5 V input range and an absolute maximum of 6 V to GND. |
| 2 | GND | power_in | Ground pin. |
| 3 | EN | input | Digital enable pin: the device is in shutdown when the voltage is below 0.4 V and enabled above 1 V, and this pin must not be left floating. |
| 4 | FB | input | Feedback analog input that connects directly to the output filter capacitor for fixed-voltage versions; the internal resistor divider is disabled on the adjustable version, which requires an external divider. |
| 5 | SW | output | Switching node connected to the internal PFET switch and NFET synchronous rectifier. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |

## CAD (KiCad official)

- Symbol: `LM3671QMF-1.2`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `lm3671qmf-1-2-etched.step` / `lm3671qmf-1-2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm3671qmf-1-2.step` / `lm3671qmf-1-2.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm3671) (37 pp, sha256 `527fd5351bf8a9da`, retrieved 2026-10-08, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/lm3671qmf-1-2-datasheet.pdf)