component
LM3424MHX
Public Made by Adomby adom
Texas Instruments LED Drivers, HTSSOP-20-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLM3424MHX
Texas Instruments · LED Drivers · HTSSOP-20-EP
LM3424MHX 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 pin (4.5 V to 75 V recommended range); bypass with a 100 nF capacitor to GND placed as close to the device as possible. |
| 2 | EN | input | Enable input: connect to more than 2.4 V to enable the device, or to less than 0.8 V for low-power shutdown. |
| 3 | COMP | input | Compensation pin: connect a capacitor to GND to compensate the control loop. |
| 4 | CSH | input | Current sense high: connect a resistor to GND to set the signal current; can also be used for analog dimming. |
| 5 | RT | input | Resistor timing: connect a resistor to GND to set the switching frequency; can also be used to synchronize to an external clock. |
| 6 | nDIM | input | Dimming input and under-voltage protection: connect a PWM signal for dimming and/or a resistor divider from VIN to program input UVLO (1.24 V threshold). |
| 7 | SS | input | Soft-start: connect a capacitor to GND to extend start-up time. |
| 8 | TGAIN | input | Temperature foldback gain: connect a resistor to GND to set the foldback slope. |
| 9 | TSENSE | input | Temperature sense input: connect a resistor/thermistor divider from VS to sense temperature. |
| 10 | TREF | input | Temperature foldback reference: connect a resistor divider from VS to set the foldback reference voltage. |
| 11 | VS | power_out | Voltage reference output: provides a 2.45 V reference for the temperature foldback circuit and other external circuitry. |
| 12 | OVP | input | Over-voltage protection: connect a resistor divider from VO to program output over-voltage lockout (1.24 V threshold). |
| 13 | DDRV | output | Dimming gate drive output: connect to the gate of the dimming MOSFET. |
| 14 | GND | power_in | Ground: connect to DAP to provide proper system GND. |
| 15 | GATE | output | Main gate drive output: connect to the gate of the main switching MOSFET; 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 GND. |
| 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 the source of the same device. |
| 18 | SLOPE | input | Slope compensation: connect a resistor to GND to set the slope of the additional ramp. |
| 19 | HSN | input | LED current sense negative: connect through a series resistor to the LED current sense resistor (negative side). |
| 20 | HSP | input | LED current sense positive: connect through a series resistor to the LED current sense resistor (positive side). |
| 21 | DAP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | HTSSOP-20-EP |
| Category | Nixie Tube Driver/LED Driver |
| Pins | 21 |
CAD (KiCad official)
- Symbol:
LM3424MHX - 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:
lm3424mhx-etched.step/lm3424mhx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm3424mhx.step/lm3424mhx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (72 pp, sha256
487cc060dc61c0aa, retrieved 2026-10-08, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).