component
LM3405AXMK
Public Made by Adomby adom
Texas Instruments LED Drivers, TSOT-23-6L. 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
markdownLM3405AXMK
Texas Instruments · LED Drivers · TSOT-23-6L
LM3405AXMK from Texas Instruments, in a TSOT-23-6L. 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 | BOOST | output | Boost voltage that drives the NMOS output switch, with a bootstrap capacitor connected between the BOOST and SW pins. |
| 2 | GND | power_in | Signal and power ground pin; the bottom resistor of the feedback network should be placed as close as possible to this pin. |
| 3 | FB | input | Feedback pin; connect FB to the LED string cathode and an external resistor to ground to set the LED current (0.205-V reference per the datasheet description). |
| 4 | EN/DIM | input | Enable control input where logic high enables operation and a periodic PWM square wave sets LED brightness; do not let this pin float or exceed VIN + 0.3 V. |
| 5 | VIN | power_in | Input supply voltage with a 3 V to 22 V operating range; connect a bypass capacitor locally from this pin to GND. |
| 6 | SW | output | Switch pin that connects to the inductor, catch diode, and bootstrap capacitor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSOT-23-6L |
| Category | LED Drivers |
| Pins | 6 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Feedback voltage | VFB | 0.188 | 0.205 | 0.22 | V | 5 | |
| Feedback input bias current | IFB | 10 | 250 | nA | Sink/source | 5 | |
| Undervoltage lockout | UVLO | 2.74 | 2.95 | V | VIN Rising | 5 | |
| Undervoltage lockout | UVLO | 1.9 | 2.3 | V | VIN Falling | 5 | |
| Switching frequency | fSW | 1.2 | 1.6 | 1.9 | MHz | 5 | |
| Maximum duty cycle | DMAX | 85 | 94 | % | VFB = 0 V | 5 | |
| Switch ON resistance (SOT package) | RDS(ON) | 300 | 600 | mΩ | SOT (VBOOST - VSW = 3 V) | 5 | |
| Switch current limit | ICL | 1.2 | 2 | 2.8 | A | VBOOST - VSW = 3 V, VIN = 3 V | 5 |
| Quiescent current (switching) | IQ | 1.8 | 2.8 | mA | Switching, VFB = 0.195 V | 5 | |
| Enable threshold voltage | VEN/DIM_TH | 1.8 | V | VEN/DIM Rising | 5 | ||
| Shutdown threshold voltage | VEN/DIM_TH | 0.4 | V | VEN/DIM Falling | 5 | ||
| Input supply voltage | VIN | -0.5 | 24 | V | 4 | ||
| SW voltage | -0.5 | 24 | V | 4 | |||
| Boost voltage | -0.5 | 30 | V | 4 | |||
| Boost to SW voltage | -0.5 | 6 | V | 4 | |||
| FB voltage | -0.5 | 3 | V | 4 | |||
| EN/DIM voltage | -0.5 | V | 4 | ||||
| Junction temperature | TJ | 150 | °C | 4 | |||
| Storage temperature | Tstg | -65 | 150 | °C | 4 | ||
| VIN input voltage | VIN | 3 | 22 | V | 4 | ||
| EN/DIM voltage | 0 | V | 4 | ||||
| Boost to SW voltage | 2.5 | 5.5 | V | 4 | |||
| Junction temperature | TJ | -40 | 125 | °C | 4 | ||
| LED current | ILED | 400 | mA | SOT package | 4 | ||
| Junction-to-ambient thermal resistance | RθJA | 182.9 | °C/W | SOT (DDC) package | 5 | ||
| Junction-to-case (top) thermal resistance | RθJC(top) | 53.4 | °C/W | SOT (DDC) package | 5 | ||
| Junction-to-board thermal resistance | RθJB | 28.1 | °C/W | SOT (DDC) package | 5 | ||
| Junction-to-top characterization parameter | ψJT | 1.2 | °C/W | SOT (DDC) package | 5 | ||
| Junction-to-board characterization parameter | ψJB | 27.7 | °C/W | SOT (DDC) package | 5 |
CAD (KiCad official)
- Symbol:
LM3405AXMK - Footprint:
Package_TO_SOT_SMD:TSOT-23-6 - 3D model: TSOT-23-6L (KiCad packages3D, STEP)
- 3D model files:
lm3405axmk-etched.step/lm3405axmk-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm3405axmk.step/lm3405axmk.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (37 pp, sha256
6ffca81b353b1a67, retrieved 2026-10-18, 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).