# LM2574N-ADJ

**Texas Instruments** · DC-DC Converters · PDIP-8

LM2574N-ADJ from Texas Instruments, in a PDIP-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 | FB | input | Feedback sense input: connect to the midpoint of the feedback divider to set VOUT for the ADJ version, or connect directly to the output capacitor for fixed-output versions. |
| 2 | SIG_GND | power_in | Signal ground, the ground reference for internal references and logic; connect to system ground. |
| 3 | ON/OFF | input | Enable input: high = OFF, low = ON; connect to GND to enable the regulator and do not leave this pin floating. |
| 4 | PWR_GND | power_in | Power ground pin; connect to system ground and to the ground pins of CIN and COUT, with the path to CIN kept as short as possible. |
| 5 | VIN | power_in | Supply input to the collector of the high-side transistor; connect to the power supply and input bypass capacitor CIN, with the paths from VIN to CIN and PWR_GND kept as short as possible. |
| 6 | NC | unconnected | No internal connection, but must be soldered to the PCB for best heat transfer. |
| 7 | OUTPUT | output | Emitter pin of the power transistor and switching node; connect to the inductor and the cathode of the external diode. |
| 8 | NC | unconnected | No internal connection, but must be soldered to the PCB for best heat transfer. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | PDIP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM2574N-ADJ`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: PDIP-8 (KiCad packages3D, STEP)
- 3D model files: `lm2574n-adj-etched.step` / `lm2574n-adj-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2574n-adj.step` / `lm2574n-adj.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/lm2574) (42 pp, sha256 `61a9f44cec6689e8`, retrieved 2026-10-11, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/lm2574n-adj-datasheet.pdf)