Power Supply Monitoring IC for automated driving

June 21, 2019 //By Wisse Hettinga
Power Supply Monitoring IC for automated driving
ROHM announced the availability of a power supply monitoring IC, the BD39040MUF-C, with BIST (Built-In Self Test) that supports functional safety.

The BD39040MUF-C is ideal for automotive application power supply systems requiring fail-safe measures such as electric power steering as well as sensors and cameras for autonomous driving and ADAS.

In addition to voltage monitoring functions (Power Good, reset) and a watchdog timer for monitoring the ECU essential for functional safety, ROHM’s power supply monitoring IC is the first in the industry to introduce a self-diagnostic function. By utilizing original technology, this IC makes it possible to detect potential failure of the power supply IC itself without affecting existing systems. The integration of these functions into a compact 3mm square package makes it ideal for ADAS applications demanding high miniaturization.

Application Examples

  • Radars, cameras, and sensors for ADAS/automated driving
  • ECUs
  • Electric power steering
  • Dashboard cluster, LCD panels
  • Infotainment
  • Lamps
  • And other power systems requiring functional safety measures beyond ASIL-B

Product Overview

  • Input Voltage Range: 2.7V to 5.5V
  • Self-diagnostic function
  • Reset function (overvoltage/undervoltage monitoring)
  • 4ch voltage monitoring function (overvoltage/undervoltage)
  • Reference voltage self-monitoring function
  • Oscillation frequency self-monitoring function
  • Window-type watchdog timer (WDT)
  • (Monitoring time can be set via external resistor; effective WDT timing can be turned ON/OFF)
  • Enables air/ground fault detection of the WDT input signal using the WDOUT pin
  • AEC-Q100 (Grade 1) qualified


More information at www.rohm.com


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