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LM2678S-5.0

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Texas Instruments DC-DC Converters, TO-263-7. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentpower management (pmic)lm2678s-5.0factory-2.0.0extractor-text

Verified LM2678S-5.0

by Ray · last 5 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

5 Nov 2026RayPublished by the parts factory: tier mfr, 8 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: LM2678S-5.0 · TO-263-7 · 8 pins
  • ✓copper: 8 copper pads, none touching another net
  • ✓datasheet: all 8 pin names found in the 39-page datasheet
  • ✓distributor: lcsc C89726, digikey LM2678S-5.0-ND, mouser 926-LM2678S-50
  • ✓family: TO-263-7_TabPin8
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-9k0sqwm5/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 8 pins = 8 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 8 pins agree
  • ✓symbol_text: no pin names collide
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ lm2678s-5-0.kicad_sym✓ lm2678s-5-0.kicad_mod✓ lm2678s-5-0.step
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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs Publish 0.1.0 · Ray 1d ago
viewers lm2678s-5-0: viewers · Ray 1d ago
lm2678s-5-0-etched.glb Publish 0.1.0 · Ray 1d ago
lm2678s-5-0-etched.step lm2678s-5-0: factory component page (tier=mfr) · Ray 1d ago
lm2678s-5-0-hero.glb lm2678s-5-0: hero GLB from the etched model (keeps the MPN mark) · Ray 1d ago
lm2678s-5-0-hero.overlay.json Publish 0.1.0 · Ray 1d ago
lm2678s-5-0.glb Publish 0.1.0 · Ray 1d ago
lm2678s-5-0.kicad_mod Publish 0.1.0 · Ray 1d ago
lm2678s-5-0.kicad_sym Publish 0.1.0 · Ray 1d ago
lm2678s-5-0.lbr Publish 0.1.0 · Ray 1d ago
lm2678s-5-0.step Publish 0.1.0 · Ray 1d ago
package.json Publish 0.1.0 · Ray 1d ago
page.json Set visibility: public · Ray 1d ago
README.md Publish 0.1.0 · Ray 1d ago
verification.json Verified: Published by the parts factory: tier mfr, 8 pins · Ray 1d ago

LM2678S-5.0

Texas Instruments · DC-DC Converters · TO-263-7

LM2678S-5.0 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 Source pin of the internal high-side FET and the switching node, which connects to the inductor and the cathode of the external diode.
2 Input power_in Supply input to the collector of the high-side FET, which connects to the power supply and input bypass capacitor CIN, with the VIN to CIN to GND path kept as short as possible; recommended supply range is 8 V to 40 V.
3 CB input Bootstrap capacitor connection for the high-side driver; connect a high-quality 100-nF capacitor from CB to the switch output pin.
4 GND power_in Power ground pin that connects to system ground and to the grounds of CIN and COUT, with the path to CIN kept as short as possible.
5 NC unconnected No connect pin.
6 FB input Feedback sense input; connect to the midpoint of the feedback divider to set VOUT for the ADJ version, or directly to the output capacitor for fixed-output versions.
7 ON/OFF input Enable input where high or floating turns the regulator ON and low turns it OFF, reducing it to the low standby current condition.
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

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output voltage VOUT 4.9 5 5.1 V TJ = 25°C, VIN = 8 V to 40 V, 100 mA ≤ IOUT ≤ 5 A 4
Output voltage over temperature VOUT 4.85 5.15 V TJ = -40°C to 125°C, VIN = 8 V to 40 V, 100 mA ≤ IOUT ≤ 5 A 5
Quiescent current IQ 4.2 6 mA VFEEDBACK = 8 V for 3.3-V, 5-V, and adjustable versions 6
Standby quiescent current ISTBY 50 100 µA ON/OFF pin = 0 V, TJ = 25°C 6
Standby quiescent current over temperature ISTBY 150 µA ON/OFF pin = 0 V, TJ = -40°C to 125°C 6
Current limit ICL 6.1 7 8.3 A TJ = 25°C 6
Current limit over temperature ICL 5.75 8.75 A TJ = -40°C to 125°C 6
Output leakage current IL 200 µA VIN = 40 V, ON/OFF pin = 0 V, VSWITCH = 0 V 6
Switch ON-resistance RDS(ON) 0.12 0.14 Ω ISWITCH = 5 A, TJ = 25°C 6
Switch ON-resistance over temperature RDS(ON) 0.225 Ω ISWITCH = 5 A, TJ = -40°C to 125°C 6
Oscillator frequency fO 260 kHz Measured at switch pin, TJ = 25°C 6
Oscillator frequency over temperature fO 225 280 kHz Measured at switch pin, TJ = -40°C to 125°C 6
Maximum duty cycle D 91 % Maximum duty cycle 6
Minimum duty cycle D 0 % Minimum duty cycle 6
ON/OFF threshold voltage VON/OFF 1.4 V TJ = 25°C 6
ON/OFF threshold voltage over temperature VON/OFF 0.8 2 V TJ = -40°C to 125°C 6
ON/OFF input current ION/OFF 20 µA ON/OFF input = 0 V, TJ = 25°C 6
ON/OFF input current over temperature ION/OFF 45 µA ON/OFF input = 0 V, TJ = -40°C to 125°C 6
Input supply voltage 45 V Absolute maximum rating 4
Soft-start pin voltage -0.1 6 V Absolute maximum rating 4
Switch voltage to ground -1 V DC voltage; extended negative limits of -10 V (20 ns), -6 V (60 ns), -3 V (100 ns) apply to pulses 4
Feedback pin voltage -0.3 14 V Absolute maximum rating 4
Soldering temperature, wave 260 °C Wave (4 s) 4
Soldering temperature, infrared 240 °C Infrared (10 s) 4
Soldering temperature, vapor phase 219 °C Vapor phase (75 s) 4
Storage temperature Tstg -65 150 °C Absolute maximum rating 4
Supply voltage 8 40 V Recommended operating condition 4
Junction temperature TJ -40 125 °C Recommended operating condition 4
Junction-to-ambient thermal resistance, 7-lead DDPAK (KTW), 0.136 in² copper RθJA 56 °C/W Mounted horizontally on PCB area of 0.136 in² (DDPAK size), 1 oz. copper, footnote (4) 4
Junction-to-ambient thermal resistance, 7-lead DDPAK (KTW), 0.4896 in² copper RθJA 35 °C/W Mounted horizontally on PCB area of 0.4896 in² (3.6 times DDPAK), 1 oz. copper, footnote (5) 4
Junction-to-case (top) thermal resistance, 7-lead DDPAK (KTW) RθJC(top) 2 °C/W KTW (TO-263) 7-pin package 5

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts copper (2) Junction to ambient thermal resistance (no external heat sink) for the 7-lead TO-220 package mounted vertically, with ½ inch leads in a socket, or on a PCB with minimum copper area. 5

CAD (KiCad official)

  • Symbol: LM2678S-5.0
  • Footprint: Package_TO_SOT_SMD:TO-263-7_TabPin8
  • 3D model: TO-263-7 (KiCad packages3D, STEP)
  • 3D model files: lm2678s-5-0-etched.step / lm2678s-5-0-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm2678s-5-0.step / lm2678s-5-0.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (39 pp, sha256 d0c40bf3d1fe1b44, retrieved 2026-11-05, tier: manufacturer)
  • 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