Motor Drivers


Richtek has developed integrated control models for brushless DC motor drivers in three phase fan systems. Richtek’s two-in-one model consists of a 3 phase motor controller with an integrated gate driver, which specifically designed for PMSM/BLDC motor applications with robust protection features. The brushless DC motor controller IC also integrates a PWM current controller to drive a BLDC motor through motion commands from a built-in micro controller.

Product Line


The RT7075 is the two-in-one integrated control module IC which consists of a 3 phase motor controller and a gate driver delicately designed for BLDC motor applications. The RT7075 integrates the ARM 32-bit Cortex-M0 core and peripheral circuits to perform a Field-Orientated-Control (FOC) and sensorless motor control. The IC has integrated various system level peripheral functions, such as ADC, DAC, communication interface, SVPWM, watchdog timer, current sensing, under voltage-lockout (UVLO), over current protection (OCP) and motor lock protection, so as to reduce component count, board space and system cost.

Furthermore,the RT7075 drives the external devices N-MOSFETs or IGBTs in a half-bridge configuration with an external bootstrap network up to 600V.


  • Fan applications: pedestal fan, ceiling fan, air conditioner indoor/outdoor fan, air cleaner, range hood, ventilation system and so on.
  • Water pump applications: washlet, jacuzzi, reverse osmosis water purifier and so on.