# LM22671MRE-5.0

**Texas Instruments** · DC-DC Converters · SO-8

LM22671MRE-5.0 from Texas Instruments, in a SO-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 | BOOT | input | Bootstrap input providing gate voltage for the high side NFET and controlling regulator start-up and shut-down; maximum voltage VSW + 7 V. |
| 2 | SS | input | Soft-start pin used to increase soft-start time with operating voltage range -0.5 to 7 V. |
| 3 | RT/SYNC | input | Switching Oscillator frequency adjust pin or frequency synchronization controlling oscillator mode of regulator with operating voltage range -0.5 to 7 V. |
| 4 | FB | input | Feedback input to regulator with operating voltage range -0.5 to 7 V. |
| 5 | EN | input | Precision enable pin used to control regulator start-up and shut-down with operating voltage range -0.5 to 6 V. |
| 6 | GND | power_in | System ground pin providing thermal connection to PCB. |
| 7 | VIN | power_in | Supply input to the regulator with recommended operating voltage range 4.5 to 42 V. |
| 8 | SW | output | Switching output of the regulator with DC voltage range approximately -5 V to VIN. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SO-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM22671MRE-5.0`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `lm22671mre-5-0-etched.step` / `lm22671mre-5-0-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm22671mre-5-0.step` / `lm22671mre-5-0.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/lm22671-q1) (33 pp, sha256 `5bdc701f26c09e8e`, retrieved 2026-10-07, 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-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/lm22671mre-5-0-datasheet.pdf)