ADM1281-1ACPZ

{
  "slug": "adm1281-1acpz",
  "version": "0.1.0",
  "type": "component",
  "description": "Analog Devices , LFCSP-32(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "ic",
    "adm1281-1acpz",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "adm1281-1acpz.kicad_sym",
    "adm1281-1acpz.kicad_mod",
    "adm1281-1acpz.glb",
    "adm1281-1acpz.step",
    "adm1281-1acpz.lbr",
    "docs/hero.png",
    "docs/adm1281-1acpz-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "adm1281-1acpz-hero.glb",
    "adm1281-1acpz-hero.overlay.json",
    "adm1281-1acpz-etched.glb"
  ],
  "component": {
    "mpn": "ADM1281-1ACPZ",
    "manufacturer": "Analog Devices",
    "package": "LFCSP-32(5x5)",
    "pin_count": 33,
    "category": "IC",
    "subcategory": "IC",
    "datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/adm1281.pdf",
    "parts": {
      "symbol": "adm1281-1acpz.kicad_sym",
      "footprint": "adm1281-1acpz.kicad_mod",
      "model_3d": "adm1281-1acpz-hero.glb",
      "model_3d_plain": "adm1281-1acpz-etched.glb",
      "model_3d_step": "adm1281-1acpz-etched.step",
      "model_3d_step_plain": "adm1281-1acpz.step",
      "lbr": "adm1281-1acpz.lbr"
    },
    "distributor_links": {
      "lcsc": "C33737397",
      "digikey": "505-ADM1281-1ACPZ-ND",
      "mouser": "584-ADM1281-1ACPZ"
    },
    "distributor_check": {
      "checked_at": "2026-11-04T12:51:54Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "505-ADM1281-1ACPZ-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-ADM1281-1ACPZ",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PSET",
        "type": "input",
        "description": "Programs the constant power limit, with FET power limited to (VPSET × 8)/(50 × RSENSE), and it can be set by a resistor divider from VCAP or an external reference."
      },
      {
        "number": "2",
        "name": "VCAP",
        "type": "power_out",
        "description": "Internal regulated supply that requires a capacitor of 1 µF or greater for accuracy and can be used as the reference for the ISET pin, regulated at 2.68 V to 2.72 V."
      },
      {
        "number": "3",
        "name": "ISET",
        "type": "input",
        "description": "Programs the current-limit threshold, with the default limit set by connecting it directly to VCAP and a recommended operating range of 0.25 V to 1.25 V for 5 mV to 25 mV VSENSE current limits."
      },
      {
        "number": "4",
        "name": "ISTART",
        "type": "input",
        "description": "Sets the start-up current limit for dv/dt power-up, active only while PWRGD is low, with an active range of 0.1 V to 1.25 V and tied to VCAP to disable the start-up limit."
      },
      {
        "number": "5",
        "name": "TIMER",
        "type": "passive",
        "description": "An external capacitor sets the initial power-on delay and overcurrent fault delay, and GATE is pulled low when TIMER exceeds its 1.0 V high threshold."
      },
      {
        "number": "6",
        "name": "FAULT",
        "type": "output",
        "description": "Open-drain output that asserts low and latches after an overcurrent fault, overtemperature fault, or FET health fault, with a low output of 0.4 V at 1 mA."
      },
      {
        "number": "7",
        "name": "ADR1",
        "type": "input",
        "description": "PMBus address select pin that can be connected to GND, connected to VCAP, left floating, or connected low through a 150 kΩ resistor, which together with ADR2 selects one of 16 addresses."
      },
      {
        "number": "8",
        "name": "ADR2",
        "type": "input",
        "description": "PMBus address select pin that can be connected to GND, connected to VCAP, left floating, or connected low through a 150 kΩ resistor, which together with ADR1 selects one of 16 addresses."
      },
      {
        "number": "9",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do not connect."
      },
      {
        "number": "10",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do not connect."
      },
      {
        "number": "11",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do not connect."
      },
      {
        "number": "12",
        "name": "ENABLE",
        "type": "input",
        "description": "On the ADM1281-1 this active-high input must be high to allow a power-up sequence, with VIH of 1.1 V minimum, VIL of 0.8 V maximum, and a 1 µs glitch filter."
      },
      {
        "number": "13",
        "name": "GPO1/ALERT1/CONV",
        "type": "bidirectional",
        "description": "Configurable as a general-purpose digital output, an open-drain alert output that is the default at power-up, or a CONV input that controls when a power monitor ADC sampling cycle begins."
      },
      {
        "number": "14",
        "name": "GPO2/ALERT2",
        "type": "output",
        "description": "Configurable as a general-purpose digital output or an open-drain alert output that is the default at power-up, with a low output of 0.4 V at 1 mA."
      },
      {
        "number": "15",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Open-drain serial data input/output that requires an external pull-up resistor, with VIH of 1.1 V minimum and VIL of 0.8 V maximum, and should be tied to GND or a pull-up if unused."
      },
      {
        "number": "16",
        "name": "SCL",
        "type": "input",
        "description": "Open-drain serial clock input that requires an external pull-up resistor, and should be tied to GND or a pull-up to VCAP or another supply if unused."
      },
      {
        "number": "17",
        "name": "RETRY",
        "type": "input",
        "description": "Has an internal 8 µA pull-up that enables the default latch-off mode after an overcurrent fault, and pulling it low enables a 10 second automatic retry."
      },
      {
        "number": "18",
        "name": "PWRGD",
        "type": "output",
        "description": "Open-drain power-good output that indicates the supply is within tolerance, no faults are detected, and the gate is fully enhanced, with a valid output guaranteed at VCC of 1 V."
      },
      {
        "number": "19",
        "name": "CSOUT",
        "type": "output",
        "description": "Outputs the VSENSE_HS voltage amplified by a gain of 350 V/V to represent load current, with total output error of ±1.6% at VSENSE_HS = 20 mV."
      },
      {
        "number": "20",
        "name": "VOUT",
        "type": "input",
        "description": "Input used to read back the output voltage through the internal ADC via a 1 kΩ series resistor from the FET source, and also used with HS− to calculate FET drain-to-source voltage for constant power foldback."
      },
      {
        "number": "21",
        "name": "PWGIN",
        "type": "input",
        "description": "Sets the power-good threshold with a 1.0 V falling threshold and 60 mV typical hysteresis, using a resistor divider from the FET source (VOUT), and PWRGD is not asserted until the output is above this threshold."
      },
      {
        "number": "22",
        "name": "GND",
        "type": "power_in",
        "description": "Ground connection for all sensitive analog nodes that should be isolated in a ground island and connected to the main ground plane at a single point as close to the pin as possible."
      },
      {
        "number": "23",
        "name": "PGND",
        "type": "power_in",
        "description": "Return path for the strong gate pull-down current and for the external transistor used for temperature measurement."
      },
      {
        "number": "24",
        "name": "GATE",
        "type": "output",
        "description": "High-side gate drive for an external N-channel FET, driven by a charge pump to regulate maximum load current, clamped to ≤31 V, and held low when VCC is below UVLO."
      },
      {
        "number": "25",
        "name": "TEMP",
        "type": "passive",
        "description": "Connects to an external NPN transistor placed near the MOSFETs for remote temperature sensing, with the voltage measured by the internal ADC and an operating range of −55 °C to +150 °C limited by the external diode."
      },
      {
        "number": "26",
        "name": "MO−",
        "type": "input",
        "description": "Negative power monitor input where a sense resistor between MO+ and MO− sets the sense voltage for load current measurement, with the power monitor amplifier input range of ±25 mV."
      },
      {
        "number": "27",
        "name": "HS−",
        "type": "input",
        "description": "Negative current sense input where a sense resistor between HS+ and HS− sets the analog current limit, and the hot-swap loop maintains VHS+ − VHS− at that sense voltage."
      },
      {
        "number": "28",
        "name": "HS+",
        "type": "input",
        "description": "Positive current sense input connected to the main supply, which together with HS− sets the analog current limit and is also used by the ADC to measure input voltage, with specifications given for VHS+ from 4 V to 20 V."
      },
      {
        "number": "29",
        "name": "MO+",
        "type": "input",
        "description": "Positive power monitor input where a sense resistor between MO+ and MO− sets the sense voltage used by the ADC to measure load current, with the power monitor amplifier input range of ±25 mV."
      },
      {
        "number": "30",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input with an operating voltage range of 4.5 V to 20 V and UVLO of 2.4 V to 2.7 V, recommended to be greater than or equal to HS+ and MO+ during normal operation."
      },
      {
        "number": "31",
        "name": "UV",
        "type": "input",
        "description": "Undervoltage input set by an external resistor divider, with a 1.0 V falling threshold, 60 mV typical hysteresis, and an absolute maximum rating of −0.3 V to +4 V."
      },
      {
        "number": "32",
        "name": "OV",
        "type": "input",
        "description": "Overvoltage input set by an external resistor divider, with a 1.0 V rising threshold, 60 mV typical hysteresis, and an absolute maximum rating of −0.3 V to +4 V."
      },
      {
        "number": "33",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "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: Pin assignments are taken from Table 8 (ADM1281-1 and ADM1281-3 combined); the Figure 4 pin diagram ; Pin types are not stated in the datasheet and were chosen per KiCad ERC classes: VCAP as power_out, ; Pins 9, 10 and 11 are marked DNC (Do Not Connect) in the datasheet, so they are listed as unconnecte",
          "exposed pad 33 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint"
        ],
        "pages_sent": 22,
        "cost_usd": 0.1508,
        "at": "2026-11-04T12:51:39"
      },
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/adm1281.pdf",
        "pages": 63,
        "sha256": "c234b2963102a5db",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "adm1281-1acpz.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.875
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
        "checked": "2026-11-04",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "adm1281-1acpz-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.875
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "c831d798945e4f1fd04d21c32469b8cbe0b0879506edc365baba2d839c42657f",
        "checked": "2026-11-04",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}