3-Phase Gate Driver with Low-Speed Operation and Integrated FOC for Automotive Fans and Pumps

Allegro MicroSystems has introduced a new A89307 automotive-qualified gate driver integrated circuit that offers ultra-low noise and vibration by using a Field Oriented Control (FOC) algorithm to drive continuous sinusoidal current to the load. This new gate driver is designed for battery cooling fans and HVAC systems in electric (EV) and hybrid vehicles and helps automakers to reduce noise and improve battery life. Moreover, with only five external components, this device decreases material costs by reducing BOM components and facilitating very small system footprints for in-motor PCBs.

This 3-phase, sensorless, brushless DC motor driver can operate from 5.5V to 50V and features an I2C interface for speed control and status readback. Modes of operation of this device include open-loop PWM or fully programmable closed-loop speed control. This gate driver also includes Low-speed operation and windmilling start-up to Improve reliability and reduce audible noise.

Features

• Code-free sensorless field-oriented control (FOC) - No software programming

• Ultra-quiet low-speed operation - Reduces audible noise and vibration

• Proprietary non-reverse fast startup - Improves reliability and reduces audible noise

• Analog, PWM, Analog, or Clock mode speed control with programmable speed profile

• Configurable current limit and lock detection - Reduces motor heating

• Start-up under both forward and reverse windmilling conditions - improves reliability

• Short-circuit protection (OCP) - protects supply and PCB from burning during MOSFET failure

Applications

• Battery Cooling Fan

• HVAC Fan

• Inverter Cooling Pump

Availability

The A89307 gate driver is now available in a 28L wettable flank QFN package.