MC34063A

{
  "schema_version": 1,
  "type": "component",
  "slug": "mc34063",
  "title": "MC34063A",
  "brief": "TI monolithic DC-DC converter control, SOIC-8. Buck, boost, or inverting; on-chip 1.5 A switch, 3-40 V. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power",
    "dc-dc",
    "switching-regulator",
    "boost",
    "buck",
    "soic-8",
    "texas-instruments"
  ],
  "component": {
    "mpn": "MC34063A",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Power Management",
    "subcategory": "DC-DC converter controller",
    "datasheet": "https://www.ti.com/lit/ds/symlink/mc34063a.pdf",
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    "pins": [
      {
        "number": "1",
        "name": "Switch Collector",
        "type": "output",
        "description": "High-current internal switch (Q1) collector. Rated 40 V max, up to 1.5 A peak switch current. Connects to the inductor/diode node of the boost/buck/inverting converter."
      },
      {
        "number": "2",
        "name": "Switch Emitter",
        "type": "output",
        "description": "High-current internal switch (Q1) emitter output. Rated 40 V max. Combined with pin 1 forms the internal Darlington output switch used to drive the converter's power inductor."
      },
      {
        "number": "3",
        "name": "Timing Capacitor",
        "type": "passive",
        "description": "Oscillator timing capacitor (C_T) pin. An external capacitor to GND sets the oscillator frequency (up to 100 kHz). Charge current typ. 35 uA, discharge typ. 220 uA, giving discharge/charge ratio ~6.5."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference. On the DRJ (QFN) package the exposed thermal pad is bonded internally to this pin."
      },
      {
        "number": "5",
        "name": "Comparator Inverting Input",
        "type": "input",
        "description": "Inverting input to the internal error comparator. Non-inverting input is internally tied to the 1.25-V (typ.) reference. Connect a resistor divider from Vout to set the regulated output voltage. Input bias current typ. -20 nA (max -400 nA). Absolute range -0.3 V to 40 V."
      },
      {
        "number": "6",
        "name": "VCC",
        "type": "power_in",
        "description": "Logic supply voltage. Tie to VIN. Operating range 3 V to 40 V (absolute max 40 V). Standby supply current typ. ~2.5 mA (max 4 mA at 5 V, C_T = 1 nF)."
      },
      {
        "number": "7",
        "name": "Ipk Sense",
        "type": "input",
        "description": "Current-limit sense input. An external resistor (Rsc) between VCC (pin 6) and this pin sets the peak switch current; the internal circuit terminates the switch on-time when the voltage across Rsc reaches ~300 mV (typ., 250-350 mV)."
      },
      {
        "number": "8",
        "name": "Driver Collector",
        "type": "output",
        "description": "Darlington driver transistor (Q2) collector input. Provides access to the driver stage for external switch configurations or Darlington operation (tie to pin 1 for internal Darlington). Rated 40 V max, driver collector current 100 mA max."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/mc34063a.pdf",
        "pages": 32,
        "sha256": "bad86a3b68c35766",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
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        "refuses_to_fabricate": true
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  },
  "metadata": {
    "specs": {
      "Type": "DC-DC converter controller",
      "Topologies": "buck, boost, inverting",
      "Switch current": "1.5 A (on-chip)",
      "Input voltage": "3-40 V",
      "Oscillator": "set by one capacitor (up to 100 kHz)",
      "Reference": "1.25 V",
      "Current limit": "Ipk sense pin",
      "Package": "SOIC-8"
    }
  },
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  "discovery_triggers": [
    "mc34063",
    "dc-dc converter",
    "boost converter chip",
    "buck boost controller",
    "switching regulator ic"
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  "discovery_pitch": "MC34063A monolithic DC-DC converter controller (SOIC-8) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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}