LM2575S-3.3

@@ -0,0 +1,47 @@+# LM2575S-3.3++**UMW** · DC-DC Converters · TO-263-5++LM2575S-3.3 from UMW, in a TO-263-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VIN | power_in | Input supply voltage. Operating range 4.75V to 40V for the LM2575 (up to 60V for the HV variant); absolute max 45V (LM2575) / 63V (LM2575HV). Requires a bulk input capacitor (e.g. 680 uF) close to this pin. |+| 2 | Output | output | Switching output from the internal 2A power transistor. Connects to the catch diode (e.g. 1N5824 Schottky) cathode and the output filter inductor. Saturation voltage ~1.16V at 2A; internal current limit typ. 2.2A. |+| 3 | GND | power_in | Device ground return. Also the thermal path for the TO-263 tab; the exposed tab is electrically connected to GND and should be soldered to a copper pour for heatsinking (theta_JA ~20-50 C/W depending on copper area). |+| 4 | Feedback | input | Output voltage feedback sense. On the fixed 3.3V version this pin is tied directly to the regulated output node; the internal reference regulates it to 3.3V (Vout tolerance +/-4% over line/load). Feedback bias current 10 nA typ (adjustable variant). |+| 5 | ON/OFF | input | Active-low shutdown input. Regulator is ON when the pin is low or left floating (VIL max 1.2V) and enters low-power standby when driven high (VIH min 1.4V, IQ_standby ~50 uA). Input range -0.3V to +VIN; TTL-compatible. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | UMW |+| Package | TO-263-5 |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `LM2575S-3.3`+- `LM2575S-3.3LM2575HVS-3.3`+- `LM2575S-3.3LM2575T-3.3`+- `LM2575S-3.3LM2575HVT-3.3`++## CAD (KiCad official)++- Symbol: `LM2575S-3.3`+- Footprint: `Package_TO_SOT_SMD:TO-263-2`+- 3D model: TO-263-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [UMW datasheet](docs/lm2575s-3-3-datasheet.pdf) (30 pp, sha256 `b0c31af439f0b6b9`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/lm2575s-3-3-datasheet.pdf)

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