The RT7081A is a two-in-one application specific IC (ASIC) designed for the motor control, specially used in Permanent Magnet Synchronous Motors (PMSM) and Brushless DC (BLDC) motors. This ASIC is highly integrated with a three-phase motor controller, a gate driver, three bootstrap diodes and LDOs.

This ASIC integrates the ARM 32-bit Cortex-M0 core to perform Filed-Oriented Control (FOC) and sensorless control with peripheral circuits which provide great benefits to users with cost-effectiveness, easy design, board space saving and high reliability.

The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 105°C.


  • PMSM/BLDC Motor
  • Pedestal Fan
  • Ceiling Fan
  • Air Conditioner Indoor/Outdoor Fan
  • Pump
Key Spec.
Status Active
Number of Phases 3
System Frequency (MHz) 60
ADC resolution (bits) 10
MCU supply voltage, Min (V) 4.85
MCU supply voltage, Max (V) 5.15
Driver Supply Voltage, Min (V) 10.8
Driver Supply Voltage, Max (V) 20
Driver Break Down Voltage (V) 600
Driving Capability, IO+ (mA) 325
Driving Capability, IO- (mA) 500
Features Adjustable Current Limit;Built-in Bootstrap Switch;I2C;OCP;OVP;SCP;UVLO;UVP
Package Type WQFN7x7-37
  • Integrated 3-Phase PMSM/BLDC Controller, LDOs, Gate Driver and Bootstrap Diodes
  • Sensorless Field Oriented Control (FOC) with Optional Hall Sense Startup Strategy
  • Built-In Short Circuit, Under-Voltage Lockout (UVLO) and Locked-Rotor Protection
  • Motor Controller
    ► ARM 32-bit Cortex-M0 CPU
    ► Memories Size 16KB MTP, Internal ROM with Embedded Motor Control Library and 4KB SRAM
    ► Normal or Deep Sleep for Power Saving
    ► I2C and UART Communication Interface
    ► 7-Channel 10-bit ADC
        ♦ AD0 to AD5 for Differential Mode Current Sense
        ♦ AD6 to AD9 for System Application
    ► 1-Channel Voltage Type 8-bit DAC
  • Gate Driver
    ► Built-In UVLO Function
    ► Matched Propagation Delays for All Channels
    ► Shoot Through Prevention
  • RT7081AGQW with Firmware Code UXYY1 Certified by UL for IEC 60730-1 Class B Compliance with Recognized Marking :
  • UL Certified No. E478780 (UL 60730-1)
  • WQFN-37L 7x7 Package
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18