# LM2694SD

**Texas Instruments** · DC-DC Converters · WSON-10-EP(3x3)

LM2694SD from Texas Instruments, in a WSON-10-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 | SW | output | Switching node, internally connected to the buck switch source, and connected to the inductor, free-wheeling diode, and bootstrap capacitor. |
| 2 | BST | passive | Bootstrap capacitor pin; a 0.022 µF capacitor is connected from SW to BST and is charged from VCC through an internal diode during the buck switch off-time. |
| 3 | ISEN | input | Current sense input through which inductor current flows via the internal sense resistor during the buck switch off-time, with the current limit nominally set at 0.62 A. |
| 4 | SGND | power_in | Current sense ground, through which re-circulating current flows to the current sense resistor. |
| 5 | RTN | power_in | Circuit ground return for all internal circuitry other than the current sense resistor. |
| 6 | FB | input | Voltage feedback input to both the regulation and over-voltage comparators, with a regulation level of 2.5 V. |
| 7 | SS | passive | Soft-start pin, where an internal current source charges the SS capacitor to 2.5 V to soft-start the reference input of the regulation comparator. |
| 8 | RON/SD | input | On-time control and shutdown; an external resistor from VIN sets the buck switch on-time, and grounding this pin shuts down the regulator. |
| 9 | VCC | power_out | Output of the start-up regulator, nominally regulated at 7 V, requiring a 0.1 µF or larger capacitor to ground placed close to the pins; MOSFET body diodes clamp VCC to VIN if VCC > VIN. |
| 10 | VIN | power_in | Input supply voltage with a nominal range of 8 V to 30 V, with input bypass capacitors located as close as possible to the VIN and RTN pins. |
| 11 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WSON-10-EP(3x3) |
| Category | Power Supply Chip |
| Pins | 11 |

## CAD (KiCad official)

- Symbol: `LM2694SD`
- Footprint: `Package_SON:VSON-10-1EP_3x3mm_P0.5mm_EP1.2x2mm`
- 3D model: WSON-10-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `lm2694sd-etched.step` / `lm2694sd-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2694sd.step` / `lm2694sd.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/lm2694) (29 pp, sha256 `d31e061483438adb`, retrieved 2026-10-08, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (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/lm2694sd-datasheet.pdf)