# LM2575S-3.3-MS

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

LM2575S-3.3-MS from MSKSEMI, 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 | Positive input supply for the switching regulator, which needs a suitable input bypass capacitor; the LM2575 operating supply range is 4.75V to 40V for the 3.3V version, with an absolute maximum supply voltage of 45V. |
| 2 | Output | output | Internal switch output that switches between (VIN − VSAT) and approximately −0.5V, and the output-to-ground steady-state voltage is limited to −1V, so the PC board copper on this pin should be kept small to limit coupling. |
| 3 | Gnd | power_in | Circuit ground for the regulator, to be connected using a ground plane or single-point grounding located close to the IC. |
| 4 | Feedback | input | Senses the regulated output voltage to close the feedback loop, with a feedback pin voltage limited to −0.3V to +25V. |
| 5 | ON/OFF | input | Logic-level shutdown input in which pulling below approximately 1.3V turns the regulator on and pulling above 1.3V shuts it off, with a maximum pin voltage of 25V; if unused it can be tied to ground or left open, leaving the regulator on. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | TO-263-5 |
| Category | Power Management (PMIC) |
| Pins | 6 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Output voltage (25 C) | VOUT | 3.168 | 3.3 | 3.432 | V | TJ = 25 C; 4.75V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 2A | 4 |
| Output voltage (full operating temperature range) | VOUT | 3.135 |  | 3.465 | V | Full operating temperature range; 4.75V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 2A | 4 |
| Oscillator frequency (25 C) | fO | 127 | 150 | 173 | kHz | TJ = 25 C; Note 6 | 5 |
| Oscillator frequency (full operating temperature range) | fO | 110 |  | 173 | kHz | Full operating temperature range; Note 6 | 5 |
| Saturation voltage (25 C) | VSAT |  | 1.16 | 1.4 | V | IOUT = 2A (Notes 7, 8); TJ = 25 C | 5 |
| Saturation voltage (full operating temperature range) | VSAT |  |  | 1.5 | V | IOUT = 2A (Notes 7, 8); full operating temperature range | 5 |
| Current limit peak current (25 C) | ICL | 3.6 | 4.5 | 6.9 | A | Peak current (Notes 7, 8); TJ = 25 C | 5 |
| Current limit peak current (full operating temperature range) | ICL | 3.4 |  | 7.5 | A | Peak current (Notes 7, 8); full operating temperature range | 5 |
| Output leakage current | IL |  |  | 50 | µA | Output = 0V (Notes 7, 9) | 5 |
| Output leakage current | IL |  | 2 | 30 | mA | Output = −1V (Note 10) | 5 |
| Quiescent current | IQ |  | 5 | 10 | mA | Note 9 | 5 |
| Standby quiescent current (25 C) | ISTBY |  | 80 | 200 | µA | ON/OFF pin = 5V (OFF) (Note 10); TJ = 25 C | 5 |
| Standby quiescent current (full operating temperature range) | ISTBY |  |  | 250 | µA | ON/OFF pin = 5V (OFF) (Note 10); full operating temperature range | 5 |
| ON/OFF pin threshold voltage, low (regulator ON) | VIH |  | 1.3 | 0.6 | V |  | 5 |
| ON/OFF pin threshold voltage, high (regulator OFF) | VIL | 2 | 1.3 |  | V |  | 5 |
| ON/OFF pin input current (regulator OFF) | IH |  | 5 | 15 | µA | VLOGIC = 2.5V (Regulator OFF) | 6 |
| ON/OFF pin input current (regulator ON) | IL |  | 0.02 | 5 | µA | VLOGIC = 0.5V (Regulator ON) | 6 |
| ON/OFF pin input voltage |  | -0.3 |  | 25 | V |  | 3 |
| Feedback pin voltage |  | -0.3 |  | 25 | V |  | 3 |
| Output voltage to ground (steady state) |  | -1 |  |  | V | Steady state | 3 |
| Maximum supply voltage (LM2575) |  |  |  | 45 | V | LM2575 (standard, not HV) | 3 |
| Storage temperature range |  | -65 |  | 150 | °C |  | 3 |
| Maximum junction temperature |  |  |  | 150 | °C |  | 3 |
| Lead temperature, vapor phase |  |  |  | 215 | °C | Vapor phase, 60 sec, S package | 3 |
| Lead temperature, infrared |  |  |  | 245 | °C | Infrared, 10 sec, S package | 3 |
| Operating temperature range (junction) | TJ | -40 |  | 125 | °C |  | 3 |
| Supply voltage (LM2575) |  |  |  | 40 | V | LM2575 (standard, not HV) | 3 |
| Thermal resistance, junction to case | JC |  | 2 |  | °C/W | TO-220 or TO-263 package, junction to case | 5 |

## CAD (KiCad official)

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

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603161884572987392) (19 pp, sha256 `ba1ba56f85adba0d`, retrieved 2026-10-19, 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/lm2575s-3-3-ms-datasheet.pdf)