LMR54406FDBVR
Public Unreviewedby Ray
Texas Instruments AC-DC Controllers and Regulators, SOT-23-6. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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README
markdownLMR54406FDBVR
Texas Instruments · AC-DC Controllers and Regulators · SOT-23-6
LMR54406FDBVR from Texas Instruments, in a SOT-23-6. 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 | CB | passive | Bootstrap capacitor connection for the high-side FET driver. Connect a high-quality 100-nF capacitor from this pin to the SW pin. |
| 2 | GND | power_in | Power ground. Connected internally to the source of the low-side FET. Connect to system ground and the ground side of CIN and COUT; the path to CIN must be as short as possible. |
| 3 | FB | input | Feedback input to the converter. Connect a resistor divider from VOUT to set the output voltage (VFB = 0.8 V typical). Never short this terminal to ground during operation. |
| 4 | EN | input | Precision enable input. Do not float. High = on, low = off; may be tied to VIN. Allows an adjustable UVLO via an external resistor divider (VEN rising ~1.23 V typical). |
| 5 | VIN | power_in | Supply input to the internal bias LDO and high-side FET. Operating range 4V to 36V (45V absolute maximum). Connect input bypass capacitors CIN directly to this pin and GND. |
| 6 | SW | power_out | Switching output of the converter. Internally connected to the source of the high-side FET and drain of the low-side FET. Connect to the power inductor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-6 |
| Category | PMIC |
| Pins | 6 |
Ordering variants
Same part, different packaging or reel option.
LMR54406FDBVR
CAD (KiCad official)
- Symbol:
LMR54406FDBVR - Footprint:
Package_TO_SOT_SMD:SOT-23-6 - 3D model: SOT-23-6 (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
lmr54406fdbvr.step |
97 KB | You want the bare part, or you mark your own boards. |
lmr54406fdbvr-etched.step |
2.3 MB | You want the part with LMR54406FDBVR already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 577 faces against 117 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (36 pp, sha256
ee6cb684e59b9ea8, retrieved 2026-08-17, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).