# LM2611BMFX

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

LM2611BMFX 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 | Drain of internal switch, -0.4 V to 36 V; connect at node of input inductor and Cuk capacitor. |
| 2 | GND | power_in | Analog and power ground. |
| 3 | NFB | input | Negative feedback input, -6 V to 0.4 V; set output voltage via external resistor divider. |
| 4 | SHDN | input | Shutdown control input, -0.4 V to 14.5 V; high enables device, low disables. |
| 5 | VIN | power_in | Analog and power input, 2.7 V to 14 V supply range; filter high frequency noise with 0.1-µF capacitor. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `LM2611BMFX`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `lm2611bmfx-etched.step` / `lm2611bmfx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2611bmfx.step` / `lm2611bmfx.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/lm2611) (29 pp, sha256 `870a9fb2a10458ec`, 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/lm2611bmfx-datasheet.pdf)