Three-phase gate driver for BLDC and PMSM motor drives
The Texas Instruments DRV8300NIPWR is a 100-V rated 3-phase gate driver designed to drive N-channel MOSFETs in high-side and low-side configurations. It integrates three independent driver channels, each capable of sourcing 750 mA and sinking 1.5 A peak current, with 12 ns typical rise and fall times for fast switching. The supply voltage ranges from 5 V to 20 V, and the bootstrap high-side voltage supports up to 105 V, making it suitable for brushless DC (BLDC) and permanent-magnet synchronous motor (PMSM) drives in industrial and automotive applications.
The 750 mA source / 1.5 A sink peak current rating determines how quickly the gate capacitance of the external MOSFETs charges and discharges. With 12 ns rise and fall times, the DRV8300NIPWR can drive medium-power MOSFETs (e.g., 10 nC to 50 nC gate charge) at PWM frequencies up to 100 kHz without excessive switching losses. For larger MOSFETs (higher Qg), external gate resistors may be needed to limit di/dt and ringing, but the driver's symmetric sink/source capability helps maintain balanced turn-on and turn-off delays. The 105 V bootstrap voltage ceiling sets the motor bus voltage limit — for a 48 V or 72 V DC bus, there is adequate headroom; for 100 V+ bus systems, you need a different driver.
Supply and logic interface
The 5 V to 20 V supply range allows the DRV8300NIPWR to be powered from a common 12 V or 15 V auxiliary rail in industrial drives, or from a 5 V rail in low-voltage designs. The logic input thresholds (VIL 0.8 V, VIH 2 V) are directly compatible with 3.3 V MCUs without level shifters, simplifying the control interface. Both inverting and non-inverting input options give flexibility to match the PWM polarity convention of the controller.
The 0.65 mm pin pitch requires standard SMT assembly. The thermal pad (if present) should be stitched with vias to a ground plane for heat dissipation, especially when driving high gate charge loads at elevated ambient temperatures.