ROHM Semiconductor announced a new lineup of high-accuracy current sense amps, the BD1423xFVJ-C and the BD1422xG-C. Both series are qualified under the AEC-Q100 automotive reliability standard. Both series are qualified under the AEC-Q100 automotive reliability standard, making them suitable for the demands of electric vehicles (EVs).
The BD1423xFVJ-C series, offered in the TSSOP-B8J package, supports input voltages up to +80 V, making it ideal for high-voltage environments increasingly common in EVs, such as 48-V dc-dc converters, redundant power supplies, auxiliary batteries, and electric compressors found in electrified drivetrains and thermal management systems.
For lower-voltage automotive applications, the BD1422xG-C, available in the compact SSOP6 package, supports input voltages up to +40 V. This series is particularly suited for space-constrained EV control units and BMS circuits, enabling current monitoring and overcurrent protection in 5V/12V supply networks used in body, power electronics, and drivetrain control systems.
Like its high-voltage counterpart, this series also includes three gain options: BD14220G-C, BD14221G-C, and BD14222G-C.
The increasing adoption of 48-V electrical architectures and the growing complexity of EVs has accelerated demand for compact, high-accuracy current sensing solutions. In EVs, precise current detection is essential for efficient power management, battery protection, and system diagnostics.
Current sense amps measure current by amplifying the small voltage drop across a shunt resistor. The resulting signal is used for real-time system control via an Adc or comparator. ROHM’s automotive-grade current sense amps are designed to meet these EV-specific demands, leveraging the company’s analog expertise to ensure accurate sensing in both high-voltage and negative-voltage environments.
The newly released products enhance space efficiency by integrating current sensing circuitry, typically built from discrete operational amplifiers, into a single compact package. This integration allows for direct shunt resistor connection, streamlining design. The two-stage amplifier structure, consisting of a chopper amplifier input and auto-zero output stage, provides ±1% current detection accuracy, even under varying temperature conditions.
These devices maintain accuracy even when paired with an external RC filter circuit for EMI suppression, simplifying system design in electrically noisy EV environments.
Additional features include -14V negative voltage tolerance, supporting protection against reverse connections, regenerative voltages, and load dumps common in electric powertrains. By offering compact, precise, and robust solutions, ROHM continues to support the electrification trend across automotive platforms, helping engineers develop reliable and efficient electric vehicles with reduced system complexity and enhanced performance.
ROHM remains committed to advancing analog and power technologies that contribute to greater precision and system reliability in electric mobility.
Filed Under: Technology News