LM2576 3A Step-Down Regulator

@@ -0,0 +1,50 @@+# LM2576++**Texas Instruments** · Switching Regulator (Buck) · TO-263-5++The LM2576 is a 3 A step-down (buck) switching regulator from the Simple Switcher family. It integrates the switch, oscillator (52 kHz), and control loop, so a working supply needs only an external inductor, catch diode, and capacitors. This 5 V fixed-output version drives loads up to 3 A from inputs to 40 V.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VIN | power_in | Supply input pin to the collector of the internal high-side power transistor. Connect to the unregulated DC input (7 V to 40 V for LM2576; up to 60 V for LM2576HV). Path from VIN to the high-frequency bypass CIN and GND must be as short as possible. |+| 2 | OUTPUT | output | Emitter pin of the internal power transistor - the switching node of the buck converter. Attach this pin to the inductor and to the cathode of the external freewheeling (catch) diode. |+| 3 | GND | power_in | Device ground reference. Return path for CIN must be as short as possible for stable switching operation. |+| 4 | FEEDBACK | input | Feedback sense input. On the ADJ version, connect to the midpoint of the external resistor divider to set VOUT (VREF = 1.23 V). On fixed-output versions (3.3/5/12/15 V), connect this pin directly to the output capacitor. |+| 5 | ~{ON}/OFF | input | Active-low enable input for the regulator. HIGH = OFF (shutdown, ~50 uA typical standby); LOW = ON. Tie to GND to permanently enable the regulator. Do not leave floating. Input voltage range -0.3 V to +VIN. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Buck (step-down) switching regulator |+| Output current | 3 A |+| Output voltage | 5 V fixed (this version) |+| Input voltage | Up to 40 V |+| Switching frequency | 52 kHz typ |+| Efficiency | 77% typ |+| Line/load regulation | Internally compensated |+| Operating temperature | -40 C to 125 C (junction) |++## Ordering variants++- `LM2576KC`+- `LM2576KTT`+- `LM2576KTTR`++## CAD (KiCad official)++- Symbol: `lm2576.kicad_sym`+- Footprint: `lm2576.kicad_mod`+- 3D model: TO-263-5 (D2PAK) surface-mount tab body from KiCad `Package_TO_SOT_SMD/TO-263-5_TabPin3`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm2576.pdf) (45 pp, sha256 `ed17313084806fc0`, retrieved 2026-08-17, tier: manufacturer)+- **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/lm2576-datasheet.pdf)

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