CN3705

{
  "schema_version": 1,
  "type": "component",
  "slug": "cn3705",
  "title": "CN3705",
  "brief": "ShangHai Consonance Elec Battery Management, TSSOP-16. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "cn3705"
  ],
  "component": {
    "mpn": "CN3705",
    "manufacturer": "ShangHai Consonance Elec",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "PMIC",
    "subcategory": "Battery Management",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/02b404b208964be2a8b4fa5ee7f42f1a.pdf",
    "parts": {
      "symbol": "cn3705.kicad_sym",
      "footprint": "cn3705.kicad_mod",
      "model_3d": "cn3705-etched.glb",
      "model_3d_plain": "cn3705.glb",
      "model_3d_step": "cn3705-etched.step",
      "model_3d_step_plain": "cn3705.step",
      "lbr": "cn3705.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "VG",
        "type": "power_out",
        "description": "Internal LDO regulator output. Provides power to the internal driver circuitry. Connect a 100nF capacitor between VG and VCC."
      },
      {
        "number": "2",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Analog ground."
      },
      {
        "number": "4",
        "name": "CHRG",
        "type": "output",
        "description": "Open-drain output. Pulled low by an internal transistor while charging; high-impedance otherwise. Typical pull-down current 12mA at VCHRG=1V; leakage <1uA at 25V."
      },
      {
        "number": "5",
        "name": "DONE",
        "type": "output",
        "description": "Open-drain output. Pulled low by an internal transistor when charging is complete; high-impedance otherwise. Typical pull-down current 12mA at VDONE=1V; leakage <1uA at 25V."
      },
      {
        "number": "6",
        "name": "TEMP",
        "type": "input",
        "description": "Battery temperature monitoring input. Connect an NTC thermistor (typ. 10kΩ) between this pin and GND. Internal 50uA pull-up; comparator thresholds Vthh=1.61V (rising) and Vthl=0.175V (falling)."
      },
      {
        "number": "7",
        "name": "EOC",
        "type": "input",
        "description": "End-of-charge current setting pin. Connect directly to GND or through a resistor to GND to set the termination current per IEOC = 1.278×(14350+Rext)/(RCS×10^6). Rext ≤ 100kΩ."
      },
      {
        "number": "8",
        "name": "COM1",
        "type": "passive",
        "description": "Loop compensation input 1. Connect a 470pF capacitor between this pin and GND."
      },
      {
        "number": "9",
        "name": "COM2",
        "type": "passive",
        "description": "Loop compensation input 2. Connect a 120Ω resistor in series with a 220nF capacitor between this pin and GND."
      },
      {
        "number": "10",
        "name": "FB",
        "type": "input",
        "description": "Battery voltage feedback input. External resistor divider from the battery sets the CV regulation voltage: VBAT = 2.416×(1+R7/R6)+IB×R7. Typical VFB=2.416V, IFB≈50nA."
      },
      {
        "number": "11",
        "name": "COM3",
        "type": "passive",
        "description": "Loop compensation input 3. Connect a 100nF capacitor between this pin and GND. Absolute max voltage on this pin is 6.5V."
      },
      {
        "number": "12",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection."
      },
      {
        "number": "13",
        "name": "CSP",
        "type": "input",
        "description": "Positive input of the charge-current sense amplifier. CSP and BAT sense the voltage across the external sense resistor RCS (200mV/RCS sets constant charge current ICH)."
      },
      {
        "number": "14",
        "name": "BAT",
        "type": "input",
        "description": "Negative input of the charge-current sense amplifier and battery terminal sense. CSP and BAT measure the voltage across RCS to regulate charge current."
      },
      {
        "number": "15",
        "name": "VCC",
        "type": "power_in",
        "description": "External supply input and internal circuit power. Operating range 7.5V to 28V; UVLO typ. 6V. Requires a bypass capacitor to GND."
      },
      {
        "number": "16",
        "name": "DRV",
        "type": "output",
        "description": "Gate driver output for external P-channel MOSFET. VH (VCC−VDRV) typ. 60mV at IDRV=−10mA; VL typ. 6.5V at IDRV=0mA. Rise/fall time ~40ns into 2nF."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/02b404b208964be2a8b4fa5ee7f42f1a.pdf",
        "pages": 12,
        "sha256": "31298125f291dc5e",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "cn3705.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "6ad5e98224d02a427d9a6b929a28dbc158b9925fba5adec12db05079f1016948",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "cn3705-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "5b3fd9c0110786f15e2125205b2ec73cf315f3e434d3d9768161b30b8d547b8a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "ShangHai Consonance Elec",
      "Package": "TSSOP-16",
      "Category": "PMIC",
      "Pins": "16"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "cn3705"
  ],
  "discovery_pitch": "CN3705 (ShangHai Consonance Elec) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "cn3705.kicad_sym",
    "cn3705.kicad_mod",
    "cn3705.glb",
    "cn3705.step",
    "cn3705.lbr",
    "docs/hero.png",
    "docs/cn3705-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T19:22:06.604Z"
}