{
  "metadata": {
    "id": "mcp16251t-i-ch",
    "name": "MCP16251T-I/CH",
    "type": "ic",
    "description": "Low-IQ PFM/PWM synchronous boost regulator with true output disconnect; adjustable 1.8–5.5 V output; starts from low-voltage single-cell sources.",
    "manufacturer": "Microchip Technology",
    "part_number": "MCP16251T-I/CH",
    "datasheet_url": "https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MCP16251-MCP16252-Data-Sheet-DS20005173.pdf",
    "tags": [
      "boost",
      "PFM",
      "PWM",
      "synchronous",
      "true-output-disconnect",
      "SOT-23-6"
    ],
    "schema_version": "1.4.0",
    "version": "1.1.0",
    "taxonomy": [
      "power.regulator"
    ]
  },
  "domains": [
    {
      "domain": "electrical",
      "power_domains": [
        {
          "id": "vin_domain",
          "name": "VIN",
          "nominal_voltage_V": 1.5,
          "voltage_range_V": [
            0.35,
            5.5
          ],
          "isolation_type": "non_isolated",
          "ground_reference": "common",
          "description": "Input supply for boost converter; device can start typically at ~0.82 V depending on load."
        }
      ],
      "resources": [
        {
          "id": "pin1_sw",
          "name": "SW (pin 1)",
          "description": "Switch node to inductor.",
          "functions": [
            {
              "name": "SW_NODE",
              "direction": "bidirectional",
              "signal_class": "power_switch_node"
            }
          ],
          "power_domain_id": "vin_domain",
          "connector_type": "smd_pad"
        },
        {
          "id": "pin2_gnd",
          "name": "GND (pin 2)",
          "description": "Ground return.",
          "functions": [
            {
              "name": "GND",
              "direction": "sink",
              "signal_class": "ground"
            }
          ],
          "power_domain_id": "vin_domain",
          "connector_type": "smd_pad"
        },
        {
          "id": "pin3_en",
          "name": "EN (pin 3)",
          "description": "Enable input.",
          "functions": [
            {
              "name": "EN",
              "direction": "input",
              "signal_class": "control"
            }
          ],
          "power_domain_id": "vin_domain",
          "connector_type": "smd_pad"
        },
        {
          "id": "pin4_vfb",
          "name": "VFB (pin 4)",
          "description": "Feedback sense input for adjustable output.",
          "functions": [
            {
              "name": "VFB_SENSE",
              "direction": "input",
              "signal_class": "analog"
            }
          ],
          "power_domain_id": "vin_domain",
          "connector_type": "smd_pad"
        },
        {
          "id": "pin5_vout",
          "name": "VOUT (pin 5)",
          "description": "Boosted output.",
          "functions": [
            {
              "name": "VOUT",
              "direction": "source",
              "signal_class": "power"
            }
          ],
          "power_domain_id": "vin_domain",
          "connector_type": "smd_pad"
        },
        {
          "id": "pin6_vin",
          "name": "VIN (pin 6)",
          "description": "Input supply.",
          "functions": [
            {
              "name": "VIN",
              "direction": "sink",
              "signal_class": "power"
            }
          ],
          "power_domain_id": "vin_domain",
          "connector_type": "smd_pad"
        }
      ],
      "interfaces": [
        {
          "id": "power_input_vin",
          "name": "Power Input",
          "protocol": {
            "type": "power",
            "role": "input"
          },
          "requires": [
            {
              "function": "VIN",
              "count": 1
            },
            {
              "function": "GND",
              "count": 1
            }
          ],
          "description": "VIN 0.35–5.5 V typical operating range."
        },
        {
          "id": "power_output_vout",
          "name": "Boost Power Output",
          "protocol": {
            "type": "power",
            "role": "output"
          },
          "requires": [
            {
              "function": "VOUT",
              "count": 1
            },
            {
              "function": "GND",
              "count": 1
            }
          ],
          "constraints": {
            "max_connections": 1
          },
          "description": "Adjustable 1.8–5.5 V. Delivers up to ~200 mA at 5 V from Li-ion input per datasheet curves."
        },
        {
          "id": "enable_ctrl",
          "name": "Enable Control",
          "protocol": {
            "type": "gpio",
            "role": "input"
          },
          "requires": [
            {
              "function": "EN",
              "count": 1
            }
          ],
          "description": "EN high ≥70% of VIN enables; low ≤20% of VIN disables."
        },
        {
          "id": "feedback_interface",
          "name": "Feedback Network",
          "protocol": {
            "type": "analog",
            "role": "input"
          },
          "requires": [
            {
              "function": "VFB_SENSE",
              "count": 1
            }
          ],
          "description": "Set VOUT with resistor divider to VFB=1.23 V."
        }
      ],
      "supply_voltage_V": [
        0.35,
        5.5
      ],
      "pin_count": 6,
      "metadata": {
        "switching_frequency_khz_typ": 500,
        "switching_frequency_khz_range": [
          425,
          575
        ],
        "iq_no_load_uA_typ": 14,
        "vfb_ref_V_typ": 1.23,
        "peak_switch_current_mA_typ": 650,
        "soft_start_ms_typ": 1.5,
        "true_output_disconnect": true
      }
    },
    {
      "domain": "mechanical",
      "resources": [],
      "interfaces": [],
      "package_type": "SOT-23-6 (CH)",
      "dimensions_mm": {
        "length": 2.9,
        "width": 1.6,
        "height": 1.45
      },
      "metadata": {
        "mounting_method": "smd",
        "pin_pitch_mm": 0.95
      }
    },
    {
      "domain": "thermal",
      "resources": [],
      "interfaces": [],
      "operating_temperature_C": [
        -40,
        85
      ],
      "metadata": {
        "theta_ja_C_per_W": 190.5,
        "thermal_shutdown_C_typ": 160,
        "requires_thermal_management": false
      }
    }
  ],
  "design_rules": [
    "Use 4.7 µH inductor (2.2–6.8 µH acceptable) rated above 650 mA peak.",
    "Place ≥4.7 µF at VIN and ~10 µF at VOUT close to pins; minimize high-current loop area.",
    "VOUT adjustable 1.8–5.5 V; ensure VOUT > VIN during regulation.",
    "EN thresholds scale with VIN: enable ≥0.7·VIN, disable ≤0.2·VIN.",
    "MCP16251 variant provides true output disconnect in shutdown.",
    "Keep feedback divider values ≤1 MΩ for full temp range to limit leakage effects."
  ],
  "usage_notes": "Starts typically at ~0.82 V into light load; after start, operation to ~0.35 V input possible depending on load and source impedance. In light load PFM mode the device draws ~14 µA from input; quiescent from output <4 µA (without divider).",
  "application_examples": [
    "Boost a single alkaline/NiMH cell to 3.3 V for MCU sensors.",
    "5 V/200 mA from single Li-ion to power logic or radios."
  ],
  "compatibility_notes": "3.3 V logic-compatible EN if driven from VIN; use level-shift if EN is driven from other rails. Ensure inductor DCR and saturation meet peak current limit.",
  "warnings": [
    "Absolute max on all pins vs GND is +6.5 V.",
    "Observe thermal limits; sustained high VIN-to-VOUT conversion at high load can raise junction temperature."
  ]
}