AP1538SG-13

{
  "schema_version": 1,
  "type": "component",
  "slug": "ap1538sg-13",
  "title": "AP1538SG-13",
  "brief": "Diodes Incorporated DC-DC Converters, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "pmic",
    "ap1538sg-13"
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  "component": {
    "mpn": "AP1538SG-13",
    "manufacturer": "Diodes Incorporated",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.diodes.com/assets/Datasheets/AP1538SG-13.pdf",
    "parts": {
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      "lbr": "ap1538sg-13.lbr"
    },
    "distributor_links": {
      "lcsc": "C507870"
    },
    "pins": [
      {
        "number": "1",
        "name": "FB",
        "type": "input",
        "description": "Feedback pin. Connect to the resistor divider from VOUT to set the regulated output voltage using VOUT = VFB x (1 + RA/RB), with VFB typically 0.8V."
      },
      {
        "number": "2",
        "name": "EN",
        "type": "input",
        "description": "Enable (power-off) pin. Drive High (>=2.0V) for normal step-down operation; drive Low (<=0.8V) to stop step-down operation and deactivate all internal circuits."
      },
      {
        "number": "3",
        "name": "OCSET",
        "type": "input",
        "description": "Over-current set pin. Connect an external resistor (typically ~3kΩ) to set the maximum output current limit; internal bias current ~90µA."
      },
      {
        "number": "4",
        "name": "VCC",
        "type": "power_in",
        "description": "IC power supply input. Operating range 3.6V to 18V; bypass locally with a decoupling capacitor (0.1µF typ) plus bulk input cap (e.g. 470µF)."
      },
      {
        "number": "5",
        "name": "Output",
        "type": "output",
        "description": "Switch node output (drain of the internal P-channel power MOSFET). Connect the external inductor and freewheel Schottky diode here; minimize trace area to reduce EMI. Pin 5 is tied internally to pin 6."
      },
      {
        "number": "6",
        "name": "Output",
        "type": "output",
        "description": "Switch node output (drain of the internal P-channel power MOSFET). Connect the external inductor and freewheel Schottky diode here; minimize trace area to reduce EMI. Pin 6 is tied internally to pin 5."
      },
      {
        "number": "7",
        "name": "Vss",
        "type": "power_in",
        "description": "Ground return. Pin 7 is tied internally to pin 8 and should be connected to the system ground plane."
      },
      {
        "number": "8",
        "name": "Vss",
        "type": "power_in",
        "description": "Ground return. Pin 8 is tied internally to pin 7 and should be connected to the system ground plane."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.diodes.com/assets/Datasheets/AP1538SG-13.pdf",
        "pages": 12,
        "sha256": "638a3ccf88cbfdca",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
    },
    "models_3d": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ap1538sg-13-etched.step",
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        "sha256": "b821bf04807768a43abfe62954d12c2ac1d7f4fe88d60024a3a776f91750f69e",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Diodes Incorporated",
      "Package": "SOIC-8",
      "Category": "PMIC",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "638a3ccf88cbfdca",
      "rows": [
        {
          "name": "Feedback Voltage",
          "symbol": "VFB",
          "kind": "electrical",
          "unit": "V",
          "min": 0.784,
          "typ": 0.8,
          "max": 0.816,
          "conditions": "IOUT = 0.1A",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Feedback Bias Current",
          "symbol": "IFB",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.1,
          "max": 0.5,
          "conditions": "IOUT = 0.1A",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Line Regulation",
          "symbol": "ΔVOUT/ΔVIN",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 1,
          "max": 2,
          "conditions": "VIN = 5V~18V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Load Regulation",
          "symbol": "ΔVOUT/VOUT",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.2,
          "max": 0.5,
          "conditions": "IOUT = 0.1 to 3A",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Oscillation Frequency",
          "symbol": "fOSC",
          "kind": "electrical",
          "unit": "KHz",
          "min": 240,
          "typ": 300,
          "max": 400,
          "conditions": "Measure waveform at SW pin",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "EN Pin Input Voltage (high)",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "Evaluate oscillation at SW pin",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "EN Pin Input Voltage (low)",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.8,
          "conditions": "Evaluate oscillation stop at SW pin",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "OCSET Pin Bias Current",
          "symbol": "IOCSET",
          "kind": "electrical",
          "unit": "µA",
          "min": 75,
          "typ": 90,
          "max": 105,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Voltage",
          "symbol": "VIN",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 3.6,
          "typ": null,
          "max": 18,
          "conditions": "Note 5",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output Current",
          "symbol": "IOUT",
          "kind": "recommended_operating",
          "unit": "A",
          "min": 0,
          "typ": null,
          "max": 3,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating Ambient Temperature",
          "symbol": "TA",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -20,
          "typ": null,
          "max": 85,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Human Body Model ESD Protection",
          "symbol": "ESD HBM",
          "kind": "absolute_maximum",
          "unit": "KV",
          "min": null,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Machine Model ESD Protection",
          "symbol": "ESD MM",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VCC Pin Voltage",
          "symbol": "VCC",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 20,
          "conditions": "Relative to VSS (printed as VSS - 0.3 to VSS + 20)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Feedback Pin Voltage",
          "symbol": "VFB",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "Relative to VSS; upper limit printed as VCC",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "EN Pin Voltage",
          "symbol": "VEN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "Relative to VSS; upper limit printed as VCC",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Switch Pin Voltage",
          "symbol": "VOUT",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "Relative to VSS; upper limit printed as VCC",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating Junction Temperature Range",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "TST",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance Junction-to-Case, SOP-8L",
          "symbol": "θJC",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 24,
          "max": null,
          "conditions": "Note 6: 2oz copper, minimum recommended pad layout top & bottom, thermal vias, double-sided FR-4 PCB",
          "source_page": 4,
          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_pitch": "AP1538SG-13 (Diodes Incorporated) component page with datasheet-verified CAD.",
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    "name": "Ray"
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  "updated_at": "2026-09-24T16:27:44.496Z"
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