UCC2891PWR

{
  "schema_version": 1,
  "type": "component",
  "slug": "ucc2891pwr",
  "title": "UCC2891PWR",
  "brief": "Texas Instruments AC-DC Controllers And Regulators, TSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power management (pmic)",
    "ucc2891pwr",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "UCC2891PWR",
    "manufacturer": "Texas Instruments",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://www.ti.com/lit/ds/symlink/ucc2891.pdf",
    "parts": {
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      "lbr": "ucc2891pwr.lbr"
    },
    "distributor_links": {
      "lcsc": "C2871729",
      "digikey": "296-UCC2891PWRTR-ND",
      "mouser": "595-UCC2891PWR"
    },
    "distributor_check": {
      "checked_at": "2026-10-11T12:55:57Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-UCC2891PWRTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-UCC2891PWR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "RTDEL",
        "type": "input",
        "description": "A resistor from this pin to GND programs the turn-on delay between the OUT and AUX gate drive outputs for active clamp resonant transitions."
      },
      {
        "number": "2",
        "name": "RTON",
        "type": "input",
        "description": "A resistor to GND programs the internal current source that charges the internal timing capacitor, setting frequency and maximum duty cycle with RTOFF (pin is held at about 2.5 V)."
      },
      {
        "number": "3",
        "name": "RTOFF",
        "type": "input",
        "description": "A resistor to GND programs the internal current source that discharges the internal timing capacitor, setting frequency and maximum duty cycle with RTON (pin is held at about 2.5 V)."
      },
      {
        "number": "4",
        "name": "VREF",
        "type": "power_out",
        "description": "5-V reference output that can supply up to about 5 mA to an external load and needs a ceramic bypass capacitor to GND (recommended 0.22 µF, min 0.022 µF, max about 22 µF)."
      },
      {
        "number": "5",
        "name": "SYNC",
        "type": "input",
        "description": "Unidirectional synchronization input for the internal oscillator, with minimum pulse width of about 50 ns and sync frequency higher than the free-running frequency."
      },
      {
        "number": "6",
        "name": "GND",
        "type": "power_in",
        "description": "Fundamental analog ground for the PWM control and programming circuitry, to be connected externally and directly to PGND."
      },
      {
        "number": "7",
        "name": "CS",
        "type": "input",
        "description": "Current-sense input for peak current-mode control and pulse-by-pulse current limiting, with a threshold of about 0.75 V for the UCC2891, fed through an RC filter from the sense resistor."
      },
      {
        "number": "8",
        "name": "RSLOPE",
        "type": "input",
        "description": "A resistor to GND programs the internal current source that sets the slope compensation ramp amplitude for current mode control."
      },
      {
        "number": "9",
        "name": "FB",
        "type": "input",
        "description": "Feedback input for the error signal from an optocoupler or error amplifier, with a useful range of about 1.25 V to 4.5 V and a pull-up resistor to VREF."
      },
      {
        "number": "10",
        "name": "SS/SD",
        "type": "input",
        "description": "A capacitor to GND is charged and discharged by a current equal to IRTON to set the soft-start interval and soft-stop shutdown, with a discharge/shutdown threshold of 0.4 to 0.6 V."
      },
      {
        "number": "11",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground and current return for the high-current OUT and AUX drivers, to be connected externally and directly to GND since the two are not connected internally."
      },
      {
        "number": "12",
        "name": "AUX",
        "type": "output",
        "description": "Output driving the P-channel auxiliary clamp MOSFET (active low on the UCC2891), on when the main switch is off, with 2-A source and 2-A sink capability."
      },
      {
        "number": "13",
        "name": "OUT",
        "type": "output",
        "description": "High-current output driving the main N-channel PWM switching MOSFET with 2-A source and 2-A sink, with a 10-kΩ resistor to PGND recommended."
      },
      {
        "number": "14",
        "name": "VDD",
        "type": "power_in",
        "description": "Supply for the device and gate drivers, recommended 8.5 to 16 V (absolute max 16.5 V), with a 1-µF capacitor to PGND at least 10 times the VREF capacitor."
      },
      {
        "number": "15",
        "name": "LINEUV",
        "type": "input",
        "description": "Line undervoltage monitor input with a 1.27-V threshold and hysteresis set by an internal current source programmed by RDEL."
      },
      {
        "number": "16",
        "name": "VIN",
        "type": "power_in",
        "description": "Connects to the input power rail to supply the internal high-voltage startup JFET, rated for a 110-V maximum input (absolute max 120 V)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet's terminal table lists VDD as an input (I); it is typed power_in here because it is th; Pin numbers and names are taken from the UCC2891/UCC2893 pin assignment for the D and PW packages (p"
        ],
        "pages_sent": 16,
        "cost_usd": 0.0964,
        "at": "2026-10-11T12:55:42"
      },
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/ucc2891.pdf",
        "pages": 41,
        "sha256": "0b123b68deef52c5",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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        "seat": "z = 0",
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "6ad5e98224d02a427d9a6b929a28dbc158b9925fba5adec12db05079f1016948",
        "checked": "2026-10-11",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ucc2891pwr-etched.step",
        "role": "eda",
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        "origin": "footprint origin = pad-pattern centre",
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        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "87f93fc6ba911d351b4e44ee3b80b64e760bb0876744c396af277aa5eec151fc",
        "checked": "2026-10-11",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "TSSOP-16",
      "Category": "Power Management (PMIC)",
      "Pins": "16"
    }
  },
  "variants": [],
  "sections": [
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  "discovery_triggers": [
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  "discovery_pitch": "UCC2891PWR (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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