# LM3676SD-3.3

**Texas Instruments** · DC-DC Converters · WSON-8-EP(3x3)

LM3676SD-3.3 from Texas Instruments, in a WSON-8-EP(3x3). 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 | PGND | power_in | Power ground pin. |
| 2 | SW | output | Switching node connection to the internal PFET switch and NFET synchronous rectifier. |
| 3 | MODE | input | Mode control pin: >1.0V selects continuous PWM mode; <0.4V selects Auto (PFM-PWM) mode. |
| 4 | FB | input | Feedback analog input; connect directly to the output filter capacitor for fixed voltage versions. |
| 5 | EN | input | Enable pin; device is in shutdown mode when voltage is <0.4V and enabled when >1.0V. |
| 6 | NC | unconnected | Not connected; leave pin floating and do not connect to other pins. |
| 7 | SGND | power_in | Signal ground pin. |
| 8 | VIN | power_in | Power supply input; connect to the input filter capacitor. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WSON-8-EP(3x3) |
| Category | Power Management (PMIC) |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `LM3676SD-3.3`
- Footprint: `Package_SON:WSON-8-1EP_3x3mm_P0.5mm_EP1.6x2.0mm`
- 3D model: WSON-8-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `lm3676sd-3-3-etched.step` / `lm3676sd-3-3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm3676sd-3-3.step` / `lm3676sd-3-3.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/lm3676) (27 pp, sha256 `32b5d5fe31ca1bd6`, 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/lm3676sd-3-3-datasheet.pdf)