# LM2575S-3.3 P+

**JSMSEMI** · DC-DC Converters · TO-263-5

LM2575S-3.3 P+ from JSMSEMI, in a TO-263-5. 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 | VIN | power_in | Unregulated input supply pin, rated for 4V to 40V operation with an absolute maximum of 45V. |
| 2 | OUTPUT | output | Switching regulator output pin, which can be taken to -1V (steady state) relative to common and is fixed at 3.3V for this -3.3 option. |
| 3 | COMMON | power_in | Common (ground) pin of the regulator, which is also connected to the package tab. |
| 4 | FEEDBACK | input | Feedback sense input to the error amplifier, with internal resistors on fixed-voltage options such as this 3.3V part. |
| 5 | ON/OFF | input | Active-low on/off control input that must stay between -0.3V and VIN, with VIL 1.0V max (on, 0V) and VIH 2.2V min (off, 5V). |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JSMSEMI |
| Package | TO-263-5 |
| Category | Power Management ICs |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `LM2575S-3.3 P+`
- Footprint: `Package_TO_SOT_SMD:TO-263-5_TabPin6`
- 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files: `lm2575s-3-3-p-etched.step` / `lm2575s-3-3-p-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2575s-3-3-p.step` / `lm2575s-3-3-p.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [JSMSEMI datasheet](docs/lm2575s-3-3-p-datasheet.pdf) (12 pp, sha256 `f2bb0fb60f90d05e`, retrieved 2026-10-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-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/lm2575s-3-3-p-datasheet.pdf)