# LM2679SX-ADJ

**Texas Instruments** · DC-DC Converters · TO-263-7

LM2679SX-ADJ from Texas Instruments, in a TO-263-7. 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 | Switch output | output | Source pin of the internal high side FET; this is a switching node; attach to inductor and external diode cathode. |
| 2 | Input | power_in | Supply input pin to high side FET collector; connect to power supply (8-40V) and input bypass capacitors; path from VIN to bypass capacitor and GND must be as short as possible. |
| 3 | CB | input | Bootstrap capacitor connection for high-side driver; connect 100-nF capacitor from this pin to switch output (VSW). |
| 4 | GND | power_in | Power ground pin; connect to system ground and ground pins of input and output capacitors; path to input bypass capacitor must be as short as possible. |
| 5 | Current adjust | input | Current limit adjust pin; connect resistor from this pin to GND to set peak current limit over range of 3A to 7A. |
| 6 | FB | input | Feedback sense input pin (−0.3V to 14V); connect to midpoint of feedback divider for adjustable version or directly to output capacitor for fixed versions. |
| 7 | SS | input | Soft-start pin (−0.1V to 6V); connect capacitor from this pin to GND to control output voltage ramp or leave floating if feature not needed. |
| 8 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-263-7 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM2679SX-ADJ`
- Footprint: `Package_TO_SOT_SMD:TO-263-7_TabPin8`
- 3D model: TO-263-7 (KiCad packages3D, STEP)
- 3D model files: `lm2679sx-adj-etched.step` / `lm2679sx-adj-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2679sx-adj.step` / `lm2679sx-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/lm2679) (38 pp, sha256 `e875ecde9bd514b4`, 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/lm2679sx-adj-datasheet.pdf)