LM3404HVMAX from Texas Instruments, in a SOIC-8. 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 pin - drain of the internal high-side N-channel MOSFET. Connect to the output inductor and to the anode of the Schottky recirculating diode. Absolute maximum SW-to-GND is -1.5 V to 76 V on the HV part.
2	BOOT	passive	MOSFET drive bootstrap pin. Connect a 10-nF ceramic capacitor from BOOT to SW to develop the gate-drive supply for the internal high-side switch. BST undervoltage lockout is ~3 V (BST-SW).
3	DIM	input	PWM dimming / enable input. Drive with a logic-level PWM signal (VIH ≥ 2.2 V, VIL ≤ 0.8 V) to gate the power MOSFET on/off and reduce average LED current. Includes an ~80 µA internal pull-up so the part runs at full duty if left open.
4	GND	power_in	Device ground. Connect to system ground and to the ground return of the input, VCC bypass, and current-sense resistor.
5	CS	input	Current-sense feedback pin. Set the LED current by connecting a sense resistor from CS to GND; the regulator turns the switch on when V(CS) falls below the 200 mV (typ) reference and turns off when V(CS) exceeds the 300 mV overvoltage threshold.
6	RON	input	On-time control pin. A resistor from RON to VIN programs the regulator's controlled on-time (hysteretic constant-off-time control). Also acts as a shutdown input - pulling RON below ~0.7 V places the device in low-power shutdown.
7	VCC	power_out	Output of the internal 7 V (typ, 6.4-7.4 V) linear regulator that supplies the gate driver and control circuits. Bypass to GND with a minimum 0.1 µF X5R/X7R ceramic capacitor. Do not load externally.
8	VIN	power_in	Input supply pin. Nominal operating range is 6 V to 75 V on the LM3404HV (6 V to 42 V on the LM3404). Bypass locally with a low-ESR ceramic input capacitor.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	LED Drivers
Pins	8

Ordering variants

Same part, different packaging or reel option.

LM3404HVMAX
LM3404HVMAXMR
LM3404HVMAXMRX

CAD (KiCad official)

Symbol: LM3404HVMAX
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (47 pp, sha256 c30b6b258c57c07a, 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).

Datasheet PDF