LM2576SX-3.3

@@ -0,0 +1,46 @@+# LM2576SX-3.3++**TECH PUBLIC LM2576SX 3 3** · DC-DC Converters · TO-263-5++LM2576SX-3.3 from TECH PUBLIC LM2576SX 3 3, 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 | Unregulated DC input supply. Recommended operating range 4.75V to 40V (absolute max 45V). Bypass locally with a low-ESR bulk capacitor (typ. 100µF) to ground. |+| 2 | Output | output | Switching output (SW) from the internal 3A NPN power switch. Connects to the catch diode cathode and the output inductor of the buck converter. Absolute max -1V to +25V relative to ground. |+| 3 | GND | power_in | Device ground reference for control circuitry and return for the internal power switch. Tie directly to the ground plane. |+| 4 | Feedback | input | Output voltage sense input for the internal error amplifier. On the fixed 3.3V version, connect directly to the regulated output node; the internal divider sets Vout = 3.3V (±4%). Feedback bias current is typically 50nA. |+| 5 | Enable | input | ON/OFF shutdown control input. Logic LOW (<1.0V) or tied to GND enables the regulator; logic HIGH (>2.2V, up to 25V absolute max) forces the regulator into low-power standby (typ. 70µA). Input current typ. 12µA at 5V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | TECH PUBLIC LM2576SX 3 3 |+| Package | TO-263-5 |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `LM2576SX-3.3SX-3.3`+- `LM2576SX-3.3SX-5.0`+- `LM2576SX-3.3SX-ADJ`++## CAD (KiCad official)++- Symbol: `LM2576SX-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:** [TECH PUBLIC LM2576SX 3 3 datasheet](docs/lm2576sx-3-3-datasheet.pdf) (6 pp, sha256 `0072318ac087ed5c`, 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/lm2576sx-3-3-datasheet.pdf)

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