The MLX91235 is a smart high-speed, coreless current sensor IC with stray field immunity. Its coreless design eliminates the need for external ferromagnetic elements (like C-cores or U-shields), reducing the system’s BOM. This monolithic Hall-effect sensor accurately measures (differential measurement) the magnetic flux density applied perpendicularly to its surface, providing a proportional analog output voltage.

• Coreless technology
  • No need for a ferromagnetic concentrator (C-core, U-shield)
  • Work closely with Melexis to ensure the best mechanical integration
• DSP compensation for high-accuracy
  • <0.5% thermal sensitivity drift from -40°C to 150°C-
  • <1% total sensitivity drift (thermal & lifetime) from -40°C to 150°C
  • Limited noise degradation over temperature
• Open calibration via SPI
  • End-of-line programmable
  • For easy in-situ adjustment
• High-speed sensing
  • DC to 500 kHz bandwidth
  • 1.5 μs response time
• Protection & diagnostics (via SPI)
  • Overcurrent detection (programmable, 1% accuracy) with fast detection (1.5µs)
  • Temperature monitoring
  • Self-test functionality
  • Broken wire detection
• Operating range
  • Supply 3.3V and 5V
  • Temperature from -40°C to 165°C
  • Ratiometric output
• ISO 26262 ASIL B compliant SEooC (Safety Element out of Context)
• AEC-Q100 – Grade 0 Automotive Qualified
• RoHS-compliant package SOIC-8 (die up)

Automotive, e-mobility and beyond

• Inverter
• Battery Management System (BMS)
• Low voltage DC-DC converter
• Smart battery junction box
• Smart fuse
• Power distribution

The transfer characteristic of the MLX91235 is factory-trimmed over temperature. Additionally, the MLX91235 is programmable (fine gain, offset, overcurrent threshold) via a digital full-duplex SPI interface during end-of-line customer calibration. Finally, the integrated stress sensor compensates for lifetime effects, ensuring long-term accuracy.

The MLX91235’s intelligent digital architecture elevates the sensor's offering, ensuring high measurement accuracy and allowing for the incorporation of several key functions that help to enhance development, calibration, and system integration. When dealing with intrinsic non-linearities, analog architectures often rely on piecewise linear compensations. However, the MLX91235's digital architecture offers the ability to implement more precise and sophisticated compensation, resulting in a more accurate and smoother output. The fully digital-based thermal compensation further ensures that the MLX91235 provides the highest accuracy measurement across its entire working conditions.