# LM2831XMFX

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

LM2831XMFX 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 | SW | output | Output switch. Connect to the inductor and catch diode. |
| 2 | GND | power_in | Signal and power ground pin. Place the bottom resistor of the feedback network as close as possible to this pin. |
| 3 | FB | input | Feedback pin. Connect to external resistor divider to set output voltage. |
| 4 | EN | input | Enable control input. Logic high enables operation. Do not allow this pin to float or be greater than VIN + 0.3 V. |
| 5 | VIN | power_in | Input supply voltage. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `LM2831XMFX`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `lm2831xmfx-etched.step` / `lm2831xmfx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2831xmfx.step` / `lm2831xmfx.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/lm2831) (39 pp, sha256 `02aa1f2beab12ad0`, retrieved 2026-10-07, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/lm2831xmfx-datasheet.pdf)