Pre-drivers MLX81340 and MLX81344 enable 500W LIN-based mechatronic module miniaturisation

Melexis has launched the LIN BLDC-motor pre-drivers for automotive mechatronic applications. The MLX81340 (32KB Flash) and MLX81344 (64KB Flash) integrate three channels of high-side and low-side drivers. They control external NFETs with up to 60nC capacitance to handle applications up to 500W.
The single-chip gen-3 LIN motor drivers are available in pin-compatible 4mm x 4mm QFN24 and 5mm x 5mm QFN32 packages that enable small-size PCBs.
“Our family of LIN drivers lets customers achieve a tailored solution for applications from below 10W up to 1000W. They leverage single-chip integration that saves space, simplifies design, and enhances reliability,” said Marc Lambrechts, product line manager, embedded motor dDrivers at Melexis. “By delivering the best combination of price and performance across a broad application spectrum, our innovative drivers enable customers to create richly featured and competitive mechatronics solutions.”
Both ICs leverage Melexis’ high-voltage SOI technology. They integrate analogue and digital circuitry with a driver stage that contains high-side and low-side drivers, a charge pump, voltage monitoring to protect the external FETs, and current sensing. Including the LIN controller and physical layer, PWM generator, diagnostics, and watchdog, the ICs permit smooth and silent field-oriented control (FOC) for BLDC motors. 

The MLX81340 and MLX81344 have been developed as ASIL-B SEooC (safety element out of context) in accordance with ISO26262 which enables the right safety diagnostics and safe operation for demanding applications. Support for developers working with the MLX81340 and MLX81344 includes a complete LIN software communication stack as well as application code examples enabling users to start evaluating their mechatronic prototypes. Melexis says the examples benefit from the company’s experience in sensorless motor driving (Trusense) or FOC to realise efficient and low acoustic noise operation.
Both ICs are qualified to AEC-Q100 and are specified over the operating temperature range -40 degrees C to 150 degrees C. 

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