# LM2738YSD

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

LM2738YSD 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 | BOOST | input | Boost voltage that drives the internal NMOS control switch, with a bootstrap capacitor connected between BOOST and SW; Boost-to-SW voltage is recommended at 2.5 V to 5.5 V. |
| 2 | VIN | power_in | Supply voltage for the output power stage; connect a bypass capacitor to this pin and tie pins 2 and 3 together at the package; recommended VIN/VCC range is 3 V to 20 V. |
| 3 | VCC | power_in | Input supply voltage of the device; connect a bypass capacitor to this pin and tie pins 2 and 3 together at the package. |
| 4 | EN | input | Enable control input where logic high enables operation; do not allow this pin to float or be greater than VIN + 0.3 V. |
| 5 | GND | power_in | Signal and power ground; place the bottom resistor of the feedback network as close as possible to this pin. |
| 6 | FB | input | Feedback pin that connects to the external resistor divider to set the output voltage, with an absolute maximum FB voltage of -0.5 V to 3 V. |
| 7 | GND | power_in | Signal and power ground; place the bottom resistor of the feedback network as close as possible to this pin. |
| 8 | SW | output | Output switch that connects to the inductor, catch diode, and bootstrap capacitor; recommended SW voltage range is -0.5 V to 20 V. |
| 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 Supply Chip |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `LM2738YSD`
- Footprint: `Package_SON:WSON-8-1EP_3x3mm_P0.5mm_EP1.6x2.0mm`
- 3D model: WSON-8-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `lm2738ysd-etched.step` / `lm2738ysd-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2738ysd.step` / `lm2738ysd.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/lm2738) (44 pp, sha256 `2b1805b4c3e0d675`, 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/lm2738ysd-datasheet.pdf)