LM25576MHX

{
  "slug": "lm25576mhx",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments DC-DC Converters, TSSOP-20-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "lm25576mhx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm25576mhx.kicad_sym",
    "lm25576mhx.kicad_mod",
    "lm25576mhx.glb",
    "lm25576mhx.step",
    "lm25576mhx.lbr",
    "docs/hero.png",
    "docs/lm25576mhx-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "component": {
    "mpn": "LM25576MHX",
    "manufacturer": "Texas Instruments",
    "package": "TSSOP-20-EP",
    "pin_count": 21,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm25576",
    "parts": {
      "symbol": "lm25576mhx.kicad_sym",
      "footprint": "lm25576mhx.kicad_mod",
      "model_3d": "lm25576mhx-etched.glb",
      "model_3d_plain": "lm25576mhx.glb",
      "model_3d_step": "lm25576mhx-etched.step",
      "model_3d_step_plain": "lm25576mhx.step",
      "lbr": "lm25576mhx.lbr"
    },
    "distributor_links": {
      "lcsc": "C14654",
      "digikey": "LM25576MHXTR-ND",
      "mouser": "926-LM25576MHX"
    },
    "distributor_check": {
      "checked_at": "2026-10-01T17:56:18Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "LM25576MHXTR-ND",
        "status": "found",
        "lifecycle": "Obsolete"
      },
      "mouser": {
        "pn": "926-LM25576MHX",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VCC",
        "type": "power_in",
        "description": "Bias regulator output providing regulated 7V nominal (or VIN direct when below 9V) with 25mA current limit; requires 0.1\u00b5F to 1\u00b5F ceramic bypass capacitor and accepts external 7.5V-14V supply to reduce IC power dissipation."
      },
      {
        "number": "2",
        "name": "SD",
        "type": "input",
        "description": "Shutdown or UVLO input controlling device state: below 0.7V activates low-power shutdown (48-85\u00b5A), 0.7V to 1.225V enables standby with VCC regulator active, above 1.225V enables normal switching with internal 5\u00b5A pull-up current source."
      },
      {
        "number": "3",
        "name": "VIN",
        "type": "power_in",
        "description": "Input power supply voltage with nominal operating range 6V to 42V, absolute maximum 45V; high-quality bypass capacitors required near this pin to limit ripple voltage and prevent overshoot during load transients."
      },
      {
        "number": "4",
        "name": "VIN",
        "type": "power_in",
        "description": "Input power supply voltage with nominal operating range 6V to 42V, absolute maximum 45V; high-quality bypass capacitors required near this pin to limit ripple voltage and prevent overshoot during load transients."
      },
      {
        "number": "5",
        "name": "SYNC",
        "type": "input",
        "description": "Oscillator synchronization input/output allowing internal oscillator to synchronize with external clock (minimum 15ns pulse width) or enable multiple LM25576 devices to synchronize together with open-drain clock driver connection."
      },
      {
        "number": "6",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output for external loop compensation network; typically Type II RC filter configuration connecting COMP to FB pin establishes loop bandwidth and provides 90-degree phase margin for stability."
      },
      {
        "number": "7",
        "name": "FB",
        "type": "input",
        "description": "Feedback signal input from regulated output connected to error amplifier inverting input; internal 1.225V precision reference voltage with \u00b11.5% accuracy and 10nA bias current sets regulation threshold."
      },
      {
        "number": "8",
        "name": "RT",
        "type": "input",
        "description": "Oscillator frequency setting input using single external resistor connected between RT and AGND pins to establish switching frequency from 50kHz to 1MHz per formula RT = (1/(F) - 580\u00d710\u207b\u2079)/(135\u00d710\u207b\u00b9\u00b2)."
      },
      {
        "number": "9",
        "name": "RAMP",
        "type": "output",
        "description": "Ramp control signal output with external capacitor (50pF to 2000pF recommended) connected between RAMP and AGND pins setting ramp slope compensation for current-mode control to prevent subharmonic oscillation at duty cycles above 50%."
      },
      {
        "number": "10",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground reference for internal control circuits, error amplifier, and precision reference; low-power signal connections (CSS, RT, CRAMP) must connect directly to this pin and connect to PGND through large copper area."
      },
      {
        "number": "11",
        "name": "SS",
        "type": "output",
        "description": "Soft start output with external capacitor and 10\u00b5A internal current source setting error amplifier reference ramp rise time constant; held low during standby mode, VCC UVLO, and thermal shutdown events (165\u00b0C threshold)."
      },
      {
        "number": "12",
        "name": "OUT",
        "type": "power_out",
        "description": "Output voltage connection point directly tied to regulated converter output through low-impedance path for external feedback network and output voltage monitoring."
      },
      {
        "number": "13",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground return reference for pre-driver switch and current sense resistor low-side connection in main power switching loop; multiple connections minimize loop inductance."
      },
      {
        "number": "14",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground return reference for pre-driver switch and current sense resistor low-side connection in main power switching loop; multiple connections minimize loop inductance."
      },
      {
        "number": "15",
        "name": "IS",
        "type": "input",
        "description": "Current sensing input measuring recirculation diode anode current through internal 42m\u03a9 sense resistor with sample-and-hold circuit capturing DC level at end of off-time; provides 0.5V/A transfer function for simulated current ramp."
      },
      {
        "number": "16",
        "name": "IS",
        "type": "input",
        "description": "Current sensing input measuring recirculation diode anode current through internal 42m\u03a9 sense resistor with sample-and-hold circuit capturing DC level at end of off-time; provides 0.5V/A transfer function for simulated current ramp."
      },
      {
        "number": "17",
        "name": "SW",
        "type": "output",
        "description": "Buck switch source terminal output connected to external Schottky diode anode and output inductor; switches between approximately -0.5V and VIN with duty cycle limited by 500ns forced off-time to allow bootstrap capacitor recharge."
      },
      {
        "number": "18",
        "name": "SW",
        "type": "output",
        "description": "Buck switch source terminal output connected to external Schottky diode anode and output inductor; switches between approximately -0.5V and VIN with duty cycle limited by 500ns forced off-time to allow bootstrap capacitor recharge."
      },
      {
        "number": "19",
        "name": "PRE",
        "type": "input",
        "description": "Bootstrap capacitor pre-charge assist input; open-drain output may be connected to SW pin enabling bootstrap capacitor charging during light-load conditions or output voltage pre-charge applications via 265ns internal MOSFET per cycle."
      },
      {
        "number": "20",
        "name": "BST",
        "type": "power_in",
        "description": "Bootstrap capacitor input requiring 0.022\u00b5F external ceramic capacitor connected between BST and SW pins with minimum-length PCB traces; capacitor charged from VCC through internal bootstrap diode during buck switch off-time."
      },
      {
        "number": "21",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.2",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.2",
        "primary_model": "claude-haiku-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-4-6",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin 6 (COMP) type not explicitly stated in datasheet table; inferred as output based on function des"
        ],
        "pages_sent": 37,
        "cost_usd": 0.5107,
        "at": "2026-10-01T17:55:55"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm25576",
        "pages": 37,
        "sha256": "ed0031dc76d29d88",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    }
  }
}