component
LM3402MMX
Public Made by Adomby adom
Texas Instruments LED Drivers, VSSOP-8-0.65mm. Datasheet-verified pinout, 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
markdownLM3402MMX
Texas Instruments · LED Drivers · VSSOP-8-0.65mm
LM3402MMX from Texas Instruments, in a VSSOP-8-0.65mm. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SW | output | Switch node. Drain of the internal high-side N-channel MOSFET; connect to the output inductor and the cathode of the recirculating Schottky diode. Swings between VIN and about -1 V during switching. |
| 2 | BOOT | passive | High-side MOSFET gate-drive bootstrap pin. Connect a 10-nF ceramic capacitor from BOOT to SW to develop the boosted gate-drive rail. BOOT-to-SW rating is 14 V max. |
| 3 | DIM | input | PWM dimming / enable input. Logic-level input (VIH >= 2.2 V, VIL <= 0.8 V) that gates the power MOSFET to modulate average LED current or place the part in low-power shutdown. Has an internal ~75 uA pull-up so the pin defaults high. |
| 4 | GND | power_in | Device ground. Connect directly to the system ground plane and to the return of CIN, CF, and RSNS. |
| 5 | CS | input | LED current-sense feedback input. Regulated to VREF-REG = 200 mV (typical) above GND; sets LED current via RSNS from CS to GND (ILED = 0.2 V / RSNS). CS above ~300 mV triggers the over-voltage / open-LED comparator that turns SW off. |
| 6 | RON | input | ON-time programming pin. A resistor from RON to VIN sets the controlled switch ON-time and thus the switching frequency of the hysteretic loop. Pulling RON below the shutdown threshold (~0.7 V) also forces the part into low-power shutdown. |
| 7 | VCC | power_out | Output of the internal 7-V linear regulator that supplies the gate-drive and control circuits. Bypass to GND with a >= 0.1 uF X5R/X7R ceramic capacitor. Not intended to source external loads (current limit ~16 mA). |
| 8 | VIN | power_in | Input supply pin. 6 V to 42 V operating range on the LM3402 (6 V to 75 V on the LM3402HV). Decouple locally to GND with CIN. Absolute-maximum 45 V (LM3402) / 76 V (HV). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8-0.65mm |
| Category | LED-drv |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
LM3402MMXLM3402MMXMRLM3402MMXMRX
CAD (KiCad official)
- Symbol:
LM3402MMX - Footprint:
Package_SO:VSSOP-8_2.3x2mm_P0.5mm - 3D model: VSSOP-8-0.65mm (KiCad packages3D, STEP)
- 3D model files:
lm3402mmx-etched.step/lm3402mmx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm3402mmx.step/lm3402mmx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (42 pp, sha256
a2d1eed98007c56f, retrieved 2026-08-17, tier: lcsc) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).