# LM3670MFX-ADJ

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

LM3670MFX-ADJ 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, connected to the input filter capacitor; recommended input voltage range is 2.5 V to 5.5 V. |
| 2 | GND | power_in | Ground pin. |
| 3 | EN | input | Digital enable input; pulling EN low puts the device in shutdown, where it draws 0.1 µA typical. |
| 4 | FB | input | Analog feedback input, connected to the output filter capacitor; on the adjustable version it sets the output voltage (0.7 V to 2.5 V). |
| 5 | SW | output | Switching node connecting the internal PFET switch and NFET synchronous rectifier to the inductor; the inductor saturation current rating must exceed the 750-mA maximum switch peak current limit. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `LM3670MFX-ADJ`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `lm3670mfx-adj-etched.step` / `lm3670mfx-adj-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm3670mfx-adj.step` / `lm3670mfx-adj.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/lm3670) (29 pp, sha256 `facbd196af963148`, retrieved 2026-10-08, 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/lm3670mfx-adj-datasheet.pdf)