Motor driver boosts new functions for EVs premiumisation

Melexis has released the MLX81334, a motor driver designed to optimise EV thermal valves (accurate battery temperature control) and expansion valves (heat pump refrigeration loop). This allows a longer range for EVs. The device complements its embedded motor drivers portfolio with extended memories and OTA support for premium software features.

The LIN-based device is a 1A-rated motor driver intended for deployment in mechatronic thermal management systems. This single-chip device efficiently drives small DC, BLDC or stepper motors. Each IC includes an embedded microcontroller (with a 16-bit application processor and a separate communications processor), four FET half-bridge drivers, data conversion circuitry, and LIN or serial interfaces. The 64KB on-chip memory of the device (versus 32KB for the MLX81332) supplies ample capacity for sophisticated software – so more safety diagnostics and essential calibration data can be included. Additionally, the device supports OTA updates.

The driver benefits from the company’s engineering expertise in high-voltage SOI technology. As a result, it integrates industry-leading operational robustness with elevated levels of functional integration. Achieving high-power operation in a streamlined form factor, the device takes up only minimal board area. This permits implementation into even the most space-constrained of mechatronic deployments.

The drivers are provided in 5mm x 5mm 32-pin QFN packages. They are ideal for use in 12V and 24V automotive systems. Over-temperature, over-current, over-voltage and under-voltage protection functions are all included.

“The latest generation of vehicle mechatronics requires high-power driving hardware with very little PCB footprint. Through our new single-chip driver, we enable more compact thermal valve electronics for electric vehicles,” Marc Lambrechts, product line manager Embedded Motor Drivers at Melexis, explains. “By keeping the bill-of-material down and the price/performance attractive, our automotive customers can develop competitive thermal management systems. Furthermore, technical support by our experienced engineers helps in achieving first-time right designs.”