# LM34914SD

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

LM34914SD 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; connect to the inductor, catch diode, and bootstrap capacitor. |
| 2 | BST | passive | Bootstrap pin; connect a 0.022 µF capacitor from SW to this pin, which is charged each off-time through an internal diode. |
| 3 | ISEN | input | Current sense input; the re-circulating current flows out of this pin to the free-wheeling diode, and the valley current limit is sensed here. |
| 4 | SGND | power_in | Sense ground; re-circulating current flows into this pin through the current sense resistor. |
| 5 | RTN | power_in | Circuit ground for all internal circuitry other than the current limit detection. |
| 6 | FB | input | Feedback input from the regulated output to the regulation and over-voltage comparators; the regulation level is 2.5 V. |
| 7 | SS | passive | Soft-start; an internal current source charges an external capacitor to 2.5 V to provide the soft-start function. |
| 8 | RON/SD | input | On-time control and shutdown; an external resistor from VIN to this pin 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 7.0 V; connect a 0.1 µF capacitor to RTN, and an external 8 V to 14 V supply may be applied to reduce internal dissipation. |
| 10 | VIN | power_in | Input supply voltage; operating input range is 8.0 V to 40 V. |
| 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: `LM34914SD`
- Footprint: `Package_SON:VSON-10-1EP_3x3mm_P0.5mm_EP1.2x2mm`
- 3D model: WSON-10-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `lm34914sd-etched.step` / `lm34914sd-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm34914sd.step` / `lm34914sd.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/lm34914) (23 pp, sha256 `b44707b706e6a9aa`, retrieved 2026-10-12, 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/lm34914sd-datasheet.pdf)