18A RMS driver for three-phase brushless DC (BLDC) motors in power tools powered by 5 lithium-ion batteries (maximum voltage 21V). This design is a compact 45 x 50 mm driver that enables sensor-based trapezoidal control. The design uses a discrete compact MOSFET-based three-phase inverter that provides 18A RMS continuous (60A peak for 1 second) winding current without the need for any external cooling devices or heat sinks. The slew rate control of the gate driver and charge pump ensure maximum inverter efficiency (>98%, 18V DC) and best EMI performance. The cycle-by-cycle overcurrent protection function prevents large stall currents in the power stage, and the board can operate at ambient temperatures up to 55°C. The small form factor supports flexible board placement, high efficiency makes the battery last longer, and the 60A peak current capacity can provide high instantaneous peak torque in power tools.