A Gate Driver is a dedicated interface circuit that amplifies and conditions control signals (from an MCU, DSP, FPGA, or controller IC) to rapidly and reliably switch power transistors—primarily MOSFETs and IGBTs—between ON and OFF states.
Core function:
Translate low-power logic signals into high-current, precisely timed gate-drive waveforms
Ensure fast switching, low losses, and safe operation of power devices
Without a gate driver, most controllers cannot source or sink sufficient current to charge and discharge a power transistor’s gate capacitance effectively.
By Topology
Type | Description | Typical Use |
Low-side driver | Drives MOSFET referenced to GND | DC-DC, load switch |
High-side driver | Drives MOSFET above supply | High-side switch |
Half-bridge driver | One high-side + one low-side | Inverters, motor drives |
Full-bridge driver | Four switches | H-bridge, SMPS |
Isolated driver | Galvanic isolation | High-voltage systems |