component
LM25576MHX
Public Made by Adomby adom
Texas Instruments DC-DC Converters, TSSOP-20-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+58@@ -0,0 +1,58 @@+# LM25576MHX++**Texas Instruments** · DC-DC Converters · TSSOP-20-EP++LM25576MHX from Texas Instruments, in a TSSOP-20-EP. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VCC | power_in | Bias regulator output providing regulated 7V nominal (or VIN direct when below 9V) with 25mA current limit; requires 0.1µF to 1µF ceramic bypass capacitor and accepts external 7.5V-14V supply to reduce IC power dissipation. |+| 2 | SD | input | Shutdown or UVLO input controlling device state: below 0.7V activates low-power shutdown (48-85µA), 0.7V to 1.225V enables standby with VCC regulator active, above 1.225V enables normal switching with internal 5µA pull-up current source. |+| 3 | VIN | power_in | 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. |+| 4 | VIN | power_in | 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. |+| 5 | SYNC | input | 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. |+| 6 | COMP | output | 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. |+| 7 | FB | input | Feedback signal input from regulated output connected to error amplifier inverting input; internal 1.225V precision reference voltage with ±1.5% accuracy and 10nA bias current sets regulation threshold. |+| 8 | RT | input | 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) - 580×10⁻⁹)/(135×10⁻¹²). |+| 9 | RAMP | output | 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%. |+| 10 | AGND | power_in | 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. |+| 11 | SS | output | Soft start output with external capacitor and 10µA internal current source setting error amplifier reference ramp rise time constant; held low during standby mode, VCC UVLO, and thermal shutdown events (165°C threshold). |+| 12 | OUT | power_out | Output voltage connection point directly tied to regulated converter output through low-impedance path for external feedback network and output voltage monitoring. |+| 13 | PGND | power_in | 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. |+| 14 | PGND | power_in | 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. |+| 15 | IS | input | Current sensing input measuring recirculation diode anode current through internal 42mΩ 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. |+| 16 | IS | input | Current sensing input measuring recirculation diode anode current through internal 42mΩ 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. |+| 17 | SW | output | 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. |+| 18 | SW | output | 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. |+| 19 | PRE | input | 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. |+| 20 | BST | power_in | Bootstrap capacitor input requiring 0.022µF 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. |+| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | TSSOP-20-EP |+| Category | Power Management (PMIC) |+| Pins | 21 |++## CAD (KiCad official)++- Symbol: `LM25576MHX`+- Footprint: `Package_SO:TSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP2.15x3.35mm`+- 3D model: TSSOP-20-EP, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 1.2 mm nominal TSSOP height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)+- 3D model files: `lm25576mhx-etched.step` / `lm25576mhx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm25576mhx.step` / `lm25576mhx.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm25576) (37 pp, sha256 `ed0031dc76d29d88`, retrieved 2026-10-01, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/lm25576mhx-datasheet.pdf)
page.jsonadded+237@@ -0,0 +1,237 @@+{+ "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 0.1µF to 1µF 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 (48-85µA), 0.7V to 1.225V enables standby with VCC regulator active, above 1.225V enables normal switching with internal 5µA 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 ±1.5% 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) - 580×10⁻⁹)/(135×10⁻¹²)."+ },+ {+ "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 10µA internal current source setting error amplifier reference ramp rise time constant; held low during standby mode, VCC UVLO, and thermal shutdown events (165°C 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 42mΩ 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 42mΩ 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 0.022µF 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"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}