Detection Amplifier Simplifies Monitoring Of High-Voltage Buses And Batteries
by Mitch Van Ochten, ROHM Semiconductor, Novi, Mich. and David Doan, ROHM Semiconductor, San Jose, Calif., How2Power Today, Feb 15 2026
Focus:
Many high-power electronics designs require continuous monitoring of either batteries or a
high-voltage bus. Traditionally this has been done by using a divider consisting of a
series string of resistors along with a differential amplifier. When using discrete
resistors, designers must consider factors affecting long-term accuracy as well as the
breakdown voltage rating of the resistors, and PCB creepage and clearance needs. A new IC,
the BM67301FV-C, simplifies such designs by integrating a high-voltage resistor divider
string with a differential amplifier and other features useful in monitoring a high-
voltage bus. In this article, the authors discuss how the resistor string is designed in
the conventional case. They then explain how the BM67301FV-C addresses these requirements
and provide guidelines for designing voltage monitoring circuits with this IC.
What you’ll learn:
- How to simplify voltage monitoring of high-voltage batteries in EVs and industrial applications
- How to design a high-voltage resistor divider
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