LM317

@@ -0,0 +1,47 @@+# LM317++**Texas Instruments** · Adjustable linear regulator · TO-220++Classic 3-terminal adjustable positive-voltage linear regulator in a TO-220 package. It holds a 1.25 V reference between OUT and ADJ, so two resistors set any output from 1.25 V to 37 V, delivering up to 1.5 A. Only two external resistors are needed (plus optional caps), and it has internal current limiting and thermal shutdown. The default adjustable bench-and-board regulator; set VOUT = 1.25 V x (1 + R2/R1).++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | ADJ | input | Adjustment pin. Ties to the midpoint of the external R1/R2 divider between OUTPUT and GND to program VOUT = 1.25V x (1 + R2/R1) + I_ADJ x R2. Internal reference holds this pin at 1.25V below OUTPUT. Typical adjustment-pin current is 50 μA (100 μA max). |+| 2 | OUT | power_out | Regulated output. Delivers up to 1.5A over VOUT = 1.25V to 37V (VIN-VOUT differential 3V to 40V). Also electrically bonded to the package TAB for heatsinking. Optional 1 μF output capacitor improves transient response. |+| 3 | IN | power_in | Unregulated input supply. Recommended 3V to 40V above VOUT (absolute max input-to-output differential 40V). Add a 0.1 μF input bypass if the device sits more than 6 inches from the input filter capacitors. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Adjustable positive linear regulator |+| Output voltage | 1.25-37 V (VREF 1.25 V) |+| Output current | 1.5 A |+| Input voltage | up to 40 V (VIN-VOUT <= 40 V) |+| Dropout | ~2 V typ |+| Protection | Current limit + thermal shutdown |+| Package | TO-220 |+| Body (L×W×H) | 10.3 × 4.6 × 15.9 mm (TO-220) |++## Ordering variants++- `LM317T (TO-220)`+- `LM317KTTR (TO-263)`++## CAD (KiCad official)++- Symbol: `Regulator_Linear:LM317_TO-220`+- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`+- 3D model: TO-220-3 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm317.pdf) (44 pp, sha256 `323ec64a58515090`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude) — every pin and dimension is cited to a datasheet page; refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/lm317-datasheet.pdf)

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