# LM3404MAX

**Texas Instruments** · LED Drivers · SOIC-8

LM3404MAX from Texas Instruments, in a SOIC-8. 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 | SW | output | Switch pin that connects to the output inductor and Schottky diode; the absolute maximum SW to GND rating is -1.5 V to 45 V for the LM3404. |
| 2 | BOOT | output | MOSFET drive bootstrap pin that requires a 10-nF ceramic capacitor connected from this pin to SW, with BOOT to SW rated at -0.3 V to 14 V. |
| 3 | DIM | input | Input for PWM dimming that enables and disables the power MOSFET when driven by a logic-level PWM signal, with DIM to GND rated at -0.3 V to 7 V. |
| 4 | GND | power_in | Ground pin that connects to system ground. |
| 5 | CS | input | Current sense feedback pin where a resistor from this pin to ground sets the LED array current, with CS to GND rated at -0.3 V to 7 V. |
| 6 | RON | input | On-time control pin where a resistor from this pin to VIN sets the regulator controlled on-time, with RON to GND rated at -0.3 V to 7 V. |
| 7 | VCC | power_out | Output of the internal 7-V linear regulator that must be bypassed to ground with a minimum 0.1-µF X5R or X7R ceramic capacitor. |
| 8 | VIN | power_in | Input voltage pin with a nominal operating range of 6 V to 42 V for the LM3404 (6 V to 75 V for the LM3404HV). |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `LM3404MAX`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `lm3404max-etched.step` / `lm3404max-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm3404max.step` / `lm3404max.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/lm3404) (47 pp, sha256 `c30b6b258c57c07a`, retrieved 2026-10-08, tier: lcsc)
- **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/lm3404max-datasheet.pdf)