# LM2575S-ADJ-MS

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

LM2575S-ADJ-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; needs a low-ESR bypass capacitor close to the pin, operating supply up to 40V (LM2575) or 57V (LM2575HV). |
| 2 | Output | output | Internal switch output that swings between (+VIN − VSAT) and approximately −0.5V with a duty cycle of about VOUT/VIN; keep connected copper area minimal and steady-state voltage to ground no lower than −1V. |
| 3 | Gnd | power_in | Circuit ground. |
| 4 | Feedback | input | Senses the regulated output voltage to complete the feedback loop (1.23V reference on the adjustable version), with a voltage range of −0.3V to +25V. |
| 5 | ON/OFF | input | Shutdown logic input: below about 1.3V (or floating/grounded) the regulator is on, above 1.3V up to a maximum of 25V it shuts down to about 80 µA standby current. |
| 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 Supply Chip |
| 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 |
|---|---|---|---|---|---|---|---|
| Feedback Voltage | VFB | 1.193 | 1.23 | 1.267 | V | 4.5V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 2A, VOUT programmed for 3V; 25°C limits (full range 1.180/1.280) | 5 |
| Feedback Voltage (full temperature range) | VFB | 1.18 |  | 1.28 | V | 4.5V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 2A, VOUT programmed for 3V; over full operating temperature range | 5 |
| Feedback Bias Current | Ib |  | 10 | 50 | nA | Adjustable version only, VFB = 1.3V; 25°C (full range 100 nA max) | 5 |
| Feedback Bias Current (full temperature range) | Ib |  |  | 100 | nA | Adjustable version only, VFB = 1.3V; full range | 5 |
| Oscillator Frequency | fO | 127 | 150 | 173 | kHz | Note 6; 25°C limits (full range 110/173) | 5 |
| Oscillator Frequency (full temperature range) | fO | 110 |  | 173 | kHz | Note 6; full range | 5 |
| Saturation Voltage | VSAT |  | 1.16 | 1.4 | V | IOUT = 2A (Notes 7, 8); 25°C (full range 1.5 V max) | 5 |
| Saturation Voltage (full temperature range) | VSAT |  |  | 1.5 | V | IOUT = 2A (Notes 7, 8); full range | 5 |
| Current Limit Peak Current | ICL | 3.6 | 4.5 | 6.9 | A | Notes 7, 8; 25°C (full range 3.4/7.5) | 5 |
| Current Limit Peak Current (full temperature range) | ICL | 3.4 |  | 7.5 | A | Notes 7, 8; full 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 | ISTBY |  | 80 | 200 | µA | ON/OFF pin = 5V (OFF) (Note 10); 25°C (full range 250 µA max) | 5 |
| Standby Quiescent Current (full temperature range) | ISTBY |  |  | 250 | µA | ON/OFF pin = 5V (OFF) (Note 10); full range | 5 |
| ON/OFF Pin Logic Input Threshold Voltage Low (Regulator ON) | VIL |  | 1.3 | 0.6 | V | Low (Regulator ON) | 5 |
| ON/OFF Pin Logic Input Threshold Voltage High (Regulator OFF) | VIH | 2 | 1.3 |  | V | High (Regulator OFF) | 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 |
| Efficiency |  |  | 73 |  | % | VIN = 12V, VOUT = 3V, ILOAD = 2A | 5 |
| Max Duty Cycle (ON) | DC |  | 100 |  | % | Note 8 | 5 |
| Min Duty Cycle (OFF) |  |  | 0 |  | % | Note 9 | 5 |
| Thermal Resistance Junction to Case | θJC |  | 2 |  | ˚C/W | TO-220 or TO-263 Package | 5 |
| Thermal Resistance Junction to Ambient | θJA |  | 50 |  | ˚C/W | TO-263 Package (Note 12) | 5 |
| Thermal Resistance Junction to Ambient | θJA |  | 30 |  | ˚C/W | TO-263 Package (Note 13) | 5 |
| Thermal Resistance Junction to Ambient | θJA |  | 20 |  | ˚C/W | TO-263 Package (Note 14) | 5 |
| Maximum Supply Voltage |  |  |  | 45 | V | LM2575 | 3 |
| ON/OFF Pin Input Voltage |  | -0.3 |  | 25 | V | −0.3 ≤ V ≤ +25V | 3 |
| Feedback Pin Voltage |  | -0.3 |  | 25 | V | −0.3 ≤ V ≤ +25V | 3 |
| Output Voltage to Ground (Steady State) |  | -1 |  |  | V | Steady state | 3 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 3 |
| Maximum Junction Temperature | TJ |  |  | 150 | °C |  | 3 |
| ESD Susceptibility |  |  |  | 2 | kV | Human Body Model | 3 |
| Lead Temperature, Vapor Phase |  |  |  | 215 | °C | S Package, 60 sec | 3 |
| Lead Temperature, Infrared |  |  |  | 245 | °C | S Package, 10 sec | 3 |
| Operating Junction Temperature Range | TJ | -40 |  | 125 | °C |  | 3 |
| Supply Voltage |  |  |  | 40 | V | LM2575 | 3 |

## CAD (KiCad official)

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

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](docs/lm2575s-adj-ms-datasheet.pdf) (19 pp, sha256 `ba1ba56f85adba0d`, retrieved 2026-10-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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-adj-ms-datasheet.pdf)