# L5970AD

**STMicroelectronics** · DC-DC Converters · SO-8

L5970AD from STMicroelectronics, in a SO-8. 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 | OUT | output | Regulator output with voltage adjustable from 1.235V to 35V and maximum current limit of 1.8A. |
| 2 | SYNC | bidirectional | Master/Slave synchronization pin with logic levels 0.74V (low) to 2.5V (high) for frequency synchronization at 500kHz and above. |
| 3 | INH | input | Active-high inhibit input disabling device above 2.2V and enabling below 0.8V, with internal pull-up when floating. |
| 4 | COMP | output | Error amplifier output for external frequency compensation with output voltage range 0.4V to 3.65V. |
| 5 | FB | input | Feedback input connected to external voltage divider (typically 4.7kΩ to ground) with reference voltage threshold of 1.235V. |
| 6 | VREF | power_in | Reference voltage output of 3.3V (3.234V to 3.366V) with maximum short-circuit current of 30mA. |
| 7 | GND | power_in | Ground power return connection. |
| 8 | VCC | power_in | Unregulated DC input voltage operating from 4.4V to 36V with maximum rating of 40V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SO-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `L5970AD`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `l5970ad-etched.step` / `l5970ad-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `l5970ad.step` / `l5970ad.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/l5970ad.pdf) (11 pp, sha256 `cf023a59e3ab8e46`, retrieved 2026-10-07, tier: manufacturer)
- **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/l5970ad-datasheet.pdf)