# LM5010SDX

**Texas Instruments** · DC-DC Converters · WSON-10-EP(4x4)

LM5010SDX from Texas Instruments, in a WSON-10-EP(4x4). 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 buck switch source driving inductor, free-wheeling diode, and bootstrap capacitor. |
| 2 | BST | input | Bootstrap pin connected to 0.022-µF capacitor from SW, charged from VCC through internal diode during OFF-time. |
| 3 | ISEN | input | Current sense input where recirculating current flows through internal sense resistor to free-wheeling diode with 1.25-A nominal current limit. |
| 4 | SGND | power_in | Sense ground with recirculating current flowing into internal current sense resistor. |
| 5 | RTN | power_in | Circuit ground for all internal circuitry other than current limit detection. |
| 6 | FB | input | Feedback input from regulated output connected to regulation and overvoltage comparators with 2.5-V regulation level. |
| 7 | SS | input | Soft start pin charged by 11.5-µA internal current source to 2.5 V providing soft start function. |
| 8 | RON/SD | input | ON-time control and shutdown where external resistor from VIN sets buck switch ON-time and grounding shuts down regulator. |
| 9 | VCC | power_in | Regulated output from internal startup regulator at 7 V nominal with external 7.5-V to 14-V supply capable of reducing dissipation via internal diode connection to VIN. |
| 10 | VIN | power_in | Input supply with 8-V to 75-V nominal input range. |
| 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(4x4) |
| Category | Power Supply Chip |
| Pins | 11 |

## CAD (KiCad official)

- Symbol: `LM5010SDX`
- Footprint: `Package_SON:WSON-10-1EP_4x4mm_P0.8mm_EP2.6x3mm`
- 3D model: WSON-10-EP(4x4) (KiCad packages3D, STEP)
- 3D model files: `lm5010sdx-etched.step` / `lm5010sdx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm5010sdx.step` / `lm5010sdx.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/lm5010) (35 pp, sha256 `10e2ba679717d7bd`, retrieved 2026-10-03, 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/lm5010sdx-datasheet.pdf)