TPS61221

@@ -0,0 +1,50 @@+# TPS61221++**Texas Instruments** · Switching regulator (boost) · SC70-6++Boosts a low input up to a regulated rail, starting from 0.7 V once running so it works from a single alkaline or NiMH cell or a nearly-flat battery. A resistor divider at FB sets the output, EN gates it, and the whole thing fits a six-pin SC70 with just an inductor and two capacitors. A low quiescent current keeps standby efficiency high. Common where a 1.5 V cell must make 3.3 V for a sensor or radio.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VIN | power_in | Boost converter input voltage supply pin. Operating range 0.7 V to 5.5 V (startup guaranteed from 0.7 V with R_LOAD >= 150 ohm). Bypass locally with a 10 µF ceramic capacitor to GND. |+| 2 | FB | input | Feedback input for the adjustable version. On this fixed-3.3 V TPS61221 variant this pin must be tied directly to VOUT (V_FB typical 500 mV on adjustable variant, I_FB <= 10 nA). |+| 3 | GND | power_in | Control-logic and power ground. Common return for input capacitor, output capacitor, and inductor current. |+| 4 | VOUT | power_out | Boost converter regulated output. Fixed 3.3 V nominal (3.20 V min / 3.41 V max). Also senses output for the internal feedback divider and provides the pass-through path when the converter is shut down. Requires a 10 µF ceramic output capacitor. |+| 5 | L | passive | Switching node / inductor connection. Ties to the free end of the boost inductor (typ. 4.7 µH); the other inductor terminal returns to VIN. Internal main (low-side) and rectifying (high-side) MOSFETs switch this node between GND and VOUT. |+| 6 | EN | input | Enable input. Drive high to enable the converter, low to disable (pass-through mode from VIN to VOUT via the rectifying switch's body diode). Must be actively driven, do not leave floating. Thresholds: for V_IN <= 1.5 V, V_IL <= 0.2*V_IN, V_IH >= 0.8*V_IN; for V_IN > 1.5 V, V_IL <= 0.4 V, V_IH >= 1.2 V. I_EN <= 0.1 µA. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Boost (step-up) converter |+| Input | 0.7-5.5 V (start-up from 0.7 V) |+| Output | Up to 5.5 V (adjustable) |+| Quiescent current | 5.5 uA (typ) |+| Light load | Power-save mode |+| Enable | EN pin |+| Package | SC70-6 |++## Ordering variants++- `TPS61221DCKR (adjustable, SC70-6)`+- `TPS61222DCKR (fixed 3.3 V)`+- `TPS61220DCKR (fixed 1.8 V)`++## CAD (KiCad official)++- Symbol: `Regulator_Switching:TPS61221DCK (KiCad official)`+- Footprint: `Package_TO_SOT_SMD:Texas_R-PDSO-G6`+- 3D model: SC70-6 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/tps61221.pdf) (28 pp, sha256 `ca17c38d6ed40a7a`, 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/tps61221-datasheet.pdf)

@@ -0,0 +1,38 @@+{+  "slug": "tps61221",+  "version": "0.1.0",+  "type": "component",+  "description": "TI low-input-voltage boost converter, SC70-6. Starts from 0.7 V, adjustable output, tiny. Datasheet-verified.",+  "tags": [+    "component",+    "power",+    "boost-converter",+    "switching-regulator",+    "dc-dc",+    "sc70-6",+    "texas-instruments"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "tps61221.kicad_sym",+    "tps61221.kicad_mod",+    "tps61221.glb",+    "tps61221.step",+    "tps61221.lbr",+    "docs/hero.png",+    "docs/tps61221-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file