Melexis Launches Digital-Output Hall-Effect Current Sensor MLX91229 to Enhance Signal Integrity in High-Power EVs

On June 26, global microelectronics engineering company Melexis introduced the MLX91229, a Hall-effect current sensor featuring a sigma-delta (Σ-Δ) digital output. The device supports a current measurement range from 200 A to 2000 A and is specifically optimized for traction inverters and other high-power automotive systems, addressing signal integrity challenges in harsh electromagnetic interference (EMI) environments. As electric vehicle (EV) powertrains evolve toward higher voltages and adopt high-speed switching technologies such as silicon carbide (SiC) and gallium nitride (GaN), the electromagnetic environment within vehicles has become increasingly complex. Traditional analog current sensors are susceptible to interference over long PCB traces or complex wiring, leading to measurement inaccuracies. The MLX91229 overcomes this by converting the signal from the analog domain to the digital domain, transmitting data as a Σ-Δ bitstream. By encoding information in pulse density rather than absolute voltage levels, the sensor inherently resists noise, significantly reducing the impact of interference on measurement accuracy during signal transmission. The sensor’s package dimensions are compatible with existing analog Hall-effect solutions, enabling engineers to evaluate digital sensing technology without major redesigns of their system layout. Additionally, its Σ-Δ output supports flexible demodulation strategies, allowing designers to balance bandwidth, noise, and response time according to application requirements. Developed based on proven technology already validated in demanding environments, the MLX91229 targets automotive and mobility applications, aiming to meet the evolving need for reliable current sensing in next-generation high-power electronic systems.