component

LM5109

Public Made by Adom

by adom

TI 100 V half-bridge MOSFET gate driver, SOIC-8. High + low side, 1 A peak, bootstrap. Datasheet-verified.

componentdrivergate-driverhalf-bridgehigh-sidesoic-8texas-instruments
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Made with kicad-footprint-generator 10.0 · KiCad file format 20260206
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docs lm5109: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
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LM5109

Texas Instruments · Half-bridge gate driver · SOIC-8

Drives the two MOSFETs of a half-bridge from separate high-side and low-side inputs, with the high-side gate referenced to a floating node that swings up to 100 V. A bootstrap diode-and-capacitor at HB/HS supplies the high-side driver, and the outputs source and sink about 1 A to switch the FETs quickly. Independent HI and LI inputs let a controller set the timing and dead-time. A compact half-bridge driver for buck stages, motor phases, and class-D outputs up to 100 V.

Pinout

Pin Name Type Function
1 VDD power_in Positive gate drive supply (8V to 14V recommended). Locally decouple to VSS using a low-ESR/ESL capacitor located as close to the IC as possible.
2 HI input High-side control input. TTL-compatible input thresholds (VIL=0.8V, VIH=2.2V max). Internal ~200kΩ pulldown. Unused HI input should be tied to ground and not left open.
3 LI input Low-side control input. TTL-compatible input thresholds (VIL=0.8V, VIH=2.2V max). Internal ~200kΩ pulldown. Unused LI input should be tied to ground and not left open.
4 VSS power_in Ground reference. All signals are referenced to this ground.
5 LO output Low-side gate driver output. Connect to the gate of the low-side N-MOS device. 1.0A peak source/sink capability.
6 HS passive High-side source connection. Connect to the negative terminal of the bootstrap capacitor and to the source of the high-side N-MOS device. Recommended operating range -1V to 90V.
7 HO output High-side gate driver output. Connect to the gate of the high-side N-MOS device. Referenced to HS with 1.0A peak source/sink capability.
8 HB power_in High-side gate driver positive supply rail (bootstrap). Connect the positive terminal of the bootstrap capacitor to HB and the negative terminal to HS. The bootstrap capacitor should be placed as close to the IC as possible. HB to VSS max 108V.

Key specifications

Parameter Value
Type Half-bridge gate driver (high + low side)
Bus voltage Up to 100 V
Peak current 1 A source / sink
Inputs Independent HI, LI
Bootstrap HB/HS high-side supply
Supply (VDD) 9-14 V
Package SOIC-8

Ordering variants

Same part, different packaging or reel option.

  • LM5109AMA (SOIC-8)
  • LM5109AMAX (SOIC-8, tape & reel)
  • LM5109BMA (matched delay)

CAD (KiCad official)

  • Symbol: Driver_FET:LM5109AMA (KiCad official)
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: lm5109-etched.step / lm5109-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm5109.step / lm5109.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (29 pp, sha256 808ea6839f052259, retrieved 2026-08-17, tier: manufacturer)
  • 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).

Datasheet PDF