component
LM2678SX-ADJ
Public Made by Adomby adom
Texas Instruments DC-DC Converters, TO-263-7. 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
markdownLM2678SX-ADJ
Texas Instruments · DC-DC Converters · TO-263-7
LM2678SX-ADJ from Texas Instruments, in a TO-263-7. 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 | Switch_output | output | Switch output; internal high-side FET source pin connected to inductor and external Schottky diode cathode. |
| 2 | Input | power_in | Power supply input (VIN 8V to 40V) connected to high-side FET drain; requires low-impedance input bypass capacitor with short trace to ground. |
| 3 | CB | input | Bootstrap capacitor connection pin; connect 100nF capacitor between this pin and switch output (pin 1) to drive gate above VIN. |
| 4 | GND | power_in | Power ground reference; system ground connection and return path for all input/output filter capacitor currents. |
| 5 | NC | unconnected | No connection pin; must be left unconnected in all applications. |
| 6 | FB | input | Feedback input; connect to feedback divider midpoint (ADJ version) to set VOUT, or directly to output capacitor (fixed versions); VFB = 1.21V nominal. |
| 7 | ON/OFF | input | Regulator enable input with 1.4V threshold; high ≥1.4V enables switching, low <0.8V disables to 50µA standby current. |
| 8 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-263-7 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
LM2678SX-ADJ - Footprint:
Package_TO_SOT_SMD:TO-263-7_TabPin8 - 3D model: TO-263-7 (KiCad packages3D, STEP)
- 3D model files:
lm2678sx-adj-etched.step/lm2678sx-adj-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm2678sx-adj.step/lm2678sx-adj.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (40 pp, sha256
a29752502faa09c0, retrieved 2026-09-25, 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: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).