ROHM (headquartered in Kyoto City, Japan), the world's leading semiconductor manufacturer, recently announced the latest launch of high-precision current detection amplifiers "BD1423xFVJ-C" and "BD1422xG-C" in accordance with the automotive standard AEC-Q100*1. The "BD1423xFVJ-C" in the TSOP-B8J package supports an input voltage of +80V, and is suitable for high voltage environments such as 48V power-driven DC-DC converters, redundant power supplies, auxiliary batteries, and electric compressors. According to its gain setting, it can be divided into three models: "BD14230FVJ-C", "BD14231FVJ-C" and "BD14232FVJ-C". The "BD1422xG-C" in a small SSOP6 package supports an input voltage of +40V, making it ideal for space-saving on-board equipment such as current monitoring and protection (overcurrent detection) in 5V/12V driven power networks in the body and drive control unit. According to its gain Settings, it can be divided into three models: "BD14220G-C", "BD14221G-C" and "BD14222G-C".

Current detection amplifier is an amplifier used to measure circuit current indirectly. Its role is to amplify the tiny voltage drop generated by the shunt resistor *2 and convert it into a measurable voltage signal for applications such as system control and monitoring.

The new product integrates the previous op-amp + discrete device op-amp circuit mode to save space, and can detect current only by connecting the shunt resistor. In addition, the new product uses a two-stage amplifier structure, the input stage uses a chopper amplifier *3, and the post-stage uses a self-stabilized zero amplifier *4. By matching a resistor inside the IC to determine the gain accuracy, it can not only suppress the influence of temperature changes, but also achieve a high precision and stable current detection of ±1%.

In addition, even with an external RC filter circuit for noise suppression, the new product can maintain current detection accuracy, helping to reduce design time. Not only that, it also has negative voltage tolerance of up to -14V, and supports reverse voltage, reverse voltage and negative voltage inputs. The +80V input voltage is also added to the product lineup to support 48V power supplies for applications such as electric vehicles (XEVs) to meet the diverse needs of in-vehicle applications.

The new product has been temporarily put into mass production in February 2025 at the scale of 100,000 units per month (sample price 450 yen/piece, excluding tax). The production base of the previous process is ROHM Hamamatsu Co., Ltd. (Hamamatsu City, Japan), The production facilities for the latter process are ROHM Integrated Systems (Thailand) Co., Ltd. (Thailand) and ROHM Electronics Philippines, Inc. (Philippines). The corresponding products can also be purchased from Ameya360, Oneyac, Sekorm and other e-commerce platforms. In addition, ROHM offers evaluation boards for customers to quickly evaluate application product designs. In the future, ROHM will continue to provide outstanding solutions that help improve the accuracy and reliability of on-board equipment.

< Development background >

In recent years, with the popularity of electric vehicles, the automotive market has been increasing systems driven by 48V power supplies in addition to traditional 5V/12V power supplies. With the increasing function of various on-board applications, the demand for monitoring and control is strong, making high-precision current detection crucial. ROHM's on-board current detection amplifiers incorporate the advantages of analog technology accumulated over the years to meet the needs of the on-board market. The products not only have excellent resistance to negative and high voltages, but also achieve high-precision current detection, helping to improve the safety and reliability of on-board applications such as electric vehicles.

< Product lineup >

ROHM also offers the current detection amplifier "BD1421x-LA" for industrial equipment applications.

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< Application Example >

· "BD1423xFVJ-C" for 48V power system: redundant power supply, auxiliary battery, DC-DC converter, electric compressor, etc

· "BD1422xG-C" for 5V/12V power system: Domain Control Unit (DCU), Electronic Control Unit (ECU), etc