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LM3423MHX
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Texas Instruments LED Drivers, HTSSOP-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 @@+# LM3423MHX++**Texas Instruments** · LED Drivers · HTSSOP-20-EP++LM3423MHX from Texas Instruments, in a HTSSOP-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 | VIN | power_in | Input voltage, recommended 4.5 V to 75 V, to be bypassed with a 100-nF capacitor to AGND as close to the device as possible. |+| 2 | EN | input | Enable: connect to AGND for zero-current shutdown, or apply more than 2.4 V to enable the device. |+| 3 | COMP | input | Compensation pin: connect a capacitor to AGND to set the control loop compensation. |+| 4 | CSH | input | Current sense high: connect a resistor to AGND to set the signal current, or a controlled current source or potentiometer to AGND for analog dimming. |+| 5 | RCT | input | Resistor-capacitor timing: the external RC network sets the predictive off-time and therefore the switching frequency. |+| 6 | AGND | power_in | Analog ground, connected to PGND through the DAP copper pad to provide the ground return for CSH, COMP, RCT and TIMR. |+| 7 | OVP | input | Overvoltage protection: connect to a resistor divider from VO to program OVLO, with a precision 1.24 V turnoff threshold and 23 µA (typical) hysteresis current. |+| 8 | nDIM | input | Dimming input and undervoltage protection: accepts a PWM signal and/or a VIN UVLO divider, with a 1.24 V turn-on threshold and 23 µA hysteresis current source. |+| 9 | FLT | output | Fault flag: N-channel open-drain output that goes high when a fault condition is latched by the timer, to be pulled up from VIN through a resistor. |+| 10 | TIMR | input | Fault timer: connect a capacitor to AGND to set the time delay before a sensed fault condition is latched. |+| 11 | LRDY | output | LED ready flag: N-channel open-drain output that pulls down when the LED current is not in regulation, to be pulled up from VIN through a resistor. |+| 12 | DPOL | input | Dim polarity: connect to AGND when dimming with a series P-channel MOSFET, or leave open when dimming with a series N-channel MOSFET. |+| 13 | DDRV | output | Dim gate drive output: connect to the gate of the dimming MOSFET. |+| 14 | PGND | power_in | Power ground, connected to AGND through the DAP copper pad to provide the ground return for GATE and DDRV. |+| 15 | GATE | output | Main gate drive output: connect to the gate of the main switching MOSFET, which is driven by a 2 Ω, 1 A peak gate driver. |+| 16 | VCC | power_out | Internal regulator output: bypass with a 2.2 µF to 3.3 µF ceramic capacitor to PGND. |+| 17 | IS | input | Main switch current sense: connect to the drain of the main N-channel MOSFET for RDS(on) sensing, or to a sense resistor in its source. |+| 18 | RPD | input | Resistor pulldown: connect the low side of all external resistor dividers (VIN UVLO, OVP) to implement zero-current shutdown. |+| 19 | HSP | input | LED current sense positive: connect through a series resistor to the positive side of the LED current sense resistor. |+| 20 | HSN | input | LED current sense negative: connect through a series resistor to the negative side of the LED current sense resistor. |+| 21 | DAP | power_in | Thermal pad on the bottom of the IC, acting as a star ground that connects AGND and PGND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | HTSSOP-20-EP |+| Category | LED Drivers |+| Pins | 21 |++## CAD (KiCad official)++- Symbol: `LM3423MHX`+- Footprint: `Package_SO:TSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP2.15x3.35mm`+- 3D model: HTSSOP-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: `lm3423mhx-etched.step` / `lm3423mhx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm3423mhx.step` / `lm3423mhx.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/lm3423) (79 pp, sha256 `5b165c52968afc7c`, retrieved 2026-10-08, 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 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (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/lm3423mhx-datasheet.pdf)
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Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "led drivers",+ "lm3423mhx",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "lm3423mhx.kicad_sym",+ "lm3423mhx.kicad_mod",+ "lm3423mhx.glb",+ "lm3423mhx.step",+ "lm3423mhx.lbr",+ "docs/hero.png",+ "docs/lm3423mhx-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html",+ "lm3423mhx-hero.glb",+ "lm3423mhx-hero.overlay.json"+ ],+ "component": {+ "mpn": "LM3423MHX",+ "manufacturer": "Texas Instruments",+ "package": "HTSSOP-20-EP",+ "pin_count": 21,+ "category": "LED Drivers",+ "subcategory": "LED Drivers",+ "datasheet": "https://www.ti.com/cn/lit/gpn/lm3423",+ "parts": {+ "symbol": "lm3423mhx.kicad_sym",+ "footprint": "lm3423mhx.kicad_mod",+ "model_3d": "lm3423mhx-hero.glb",+ "model_3d_plain": "lm3423mhx.glb",+ "model_3d_step": "lm3423mhx-etched.step",+ "model_3d_step_plain": "lm3423mhx.step",+ "lbr": "lm3423mhx.lbr"+ },+ "distributor_links": {+ "lcsc": "C2679102"+ },+ "distributor_check": {+ "checked_at": "2026-10-08T01:39:37Z",+ "source": "Component Ocean /api/assign-pns",+ "digikey": {+ "pn": null,+ "status": "no match"+ },+ "mouser": {+ "pn": null,+ "status": "no match"+ }+ },+ "pins": [+ {+ "number": "1",+ "name": "VIN",+ "type": "power_in",+ "description": "Input voltage, recommended 4.5 V to 75 V, to be bypassed with a 100-nF capacitor to AGND as close to the device as possible."+ },+ {+ "number": "2",+ "name": "EN",+ "type": "input",+ "description": "Enable: connect to AGND for zero-current shutdown, or apply more than 2.4 V to enable the device."+ },+ {+ "number": "3",+ "name": "COMP",+ "type": "input",+ "description": "Compensation pin: connect a capacitor to AGND to set the control loop compensation."+ },+ {+ "number": "4",+ "name": "CSH",+ "type": "input",+ "description": "Current sense high: connect a resistor to AGND to set the signal current, or a controlled current source or potentiometer to AGND for analog dimming."+ },+ {+ "number": "5",+ "name": "RCT",+ "type": "input",+ "description": "Resistor-capacitor timing: the external RC network sets the predictive off-time and therefore the switching frequency."+ },+ {+ "number": "6",+ "name": "AGND",+ "type": "power_in",+ "description": "Analog ground, connected to PGND through the DAP copper pad to provide the ground return for CSH, COMP, RCT and TIMR."+ },+ {+ "number": "7",+ "name": "OVP",+ "type": "input",+ "description": "Overvoltage protection: connect to a resistor divider from VO to program OVLO, with a precision 1.24 V turnoff threshold and 23 µA (typical) hysteresis current."+ },+ {+ "number": "8",+ "name": "nDIM",+ "type": "input",+ "description": "Dimming input and undervoltage protection: accepts a PWM signal and/or a VIN UVLO divider, with a 1.24 V turn-on threshold and 23 µA hysteresis current source."+ },+ {+ "number": "9",+ "name": "FLT",+ "type": "output",+ "description": "Fault flag: N-channel open-drain output that goes high when a fault condition is latched by the timer, to be pulled up from VIN through a resistor."+ },+ {+ "number": "10",+ "name": "TIMR",+ "type": "input",+ "description": "Fault timer: connect a capacitor to AGND to set the time delay before a sensed fault condition is latched."+ },+ {+ "number": "11",+ "name": "LRDY",+ "type": "output",+ "description": "LED ready flag: N-channel open-drain output that pulls down when the LED current is not in regulation, to be pulled up from VIN through a resistor."+ },+ {+ "number": "12",+ "name": "DPOL",+ "type": "input",+ "description": "Dim polarity: connect to AGND when dimming with a series P-channel MOSFET, or leave open when dimming with a series N-channel MOSFET."+ },+ {+ "number": "13",+ "name": "DDRV",+ "type": "output",+ "description": "Dim gate drive output: connect to the gate of the dimming MOSFET."+ },+ {+ "number": "14",+ "name": "PGND",+ "type": "power_in",+ "description": "Power ground, connected to AGND through the DAP copper pad to provide the ground return for GATE and DDRV."+ },+ {+ "number": "15",+ "name": "GATE",+ "type": "output",+ "description": "Main gate drive output: connect to the gate of the main switching MOSFET, which is driven by a 2 Ω, 1 A peak gate driver."+ },+ {+ "number": "16",+ "name": "VCC",+ "type": "power_out",+ "description": "Internal regulator output: bypass with a 2.2 µF to 3.3 µF ceramic capacitor to PGND."+ },+ {+ "number": "17",+ "name": "IS",+ "type": "input",+ "description": "Main switch current sense: connect to the drain of the main N-channel MOSFET for RDS(on) sensing, or to a sense resistor in its source."+ },+ {+ "number": "18",+ "name": "RPD",+ "type": "input",+ "description": "Resistor pulldown: connect the low side of all external resistor dividers (VIN UVLO, OVP) to implement zero-current shutdown."+ },+ {+ "number": "19",+ "name": "HSP",+ "type": "input",+ "description": "LED current sense positive: connect through a series resistor to the positive side of the LED current sense resistor."+ },+ {+ "number": "20",+ "name": "HSN",+ "type": "input",+ "description": "LED current sense negative: connect through a series resistor to the negative side of the LED current sense resistor."+ },+ {+ "number": "21",+ "name": "DAP",+ "type": "power_in",+ "description": "Thermal pad on the bottom of the IC, acting as a star ground that connects AGND and PGND."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-haiku-5-5",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "extractor flagged: Package is taken from the ordering addendum: LM3423MHX/NOPB is a 20-pin HTSSOP (PWP) on 2500-piece l; Datasheet pin table lists VCC as type I, but its description says it is the internal regulator outpu; Datasheet pin table lists FLT as type I, but its description says it is an N-channel open-drain outp"+ ],+ "pages_sent": 13,+ "cost_usd": 0.0877,+ "at": "2026-10-08T01:39:11"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/lm3423",+ "pages": 79,+ "sha256": "5b165c52968afc7c",+ "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"+ },+ "models_3d": [+ {+ "file": "lm3423mhx.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6.41,+ 6.5,+ 1.2+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "20a7827db3a9644292f3b84d57d9b532ba4045ac9b0a76014c6c55294dcb7d0c",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "lm3423mhx-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6.41,+ 6.5,+ 1.2+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "a1d04832b3681c78a00a1b8034422324353ef3dfa416ccf882a1a4e0dffa0092",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}