ROHM announced the development of two new series of current sense amplifiers, the BD1423xFVJ-C and BD1422xG-C, both compliant with the AEC-Q100 automotive reliability standard. The BD1423xFVJ-C series, available in the TSSOP-B8J package, supports input voltages up to +80V and includes three models (BD14230FVJ-C, BD14231FVJ-C, and BD14232FVJ-C) with different gain settings. It is designed for high-voltage applications such as 48V DC-DC converters, redundant power supplies, auxiliary batteries, and electric compressors.
The BD1422xG-C series, offered in the SSOP6 package, supports input voltages up to +40V and includes three models (BD14220G-C, BD14221G-C, and BD14222G-C) with varying gain options. It targets space-constrained automotive applications like current monitoring and overcurrent protection in 5V/12V power supply networks for body and drivetrain systems.
Both series integrate current sensing circuitry, requiring only a shunt resistor for operation, and use a two-stage amplifier design with a chopper amplifier at the input and an auto-zero amplifier at the output. This configuration achieves ±1% current sensing accuracy, minimizes temperature variation effects, and maintains performance with external RC filter circuits for noise suppression. The amplifiers feature -14V negative voltage tolerance to handle back electromotive force, reverse connections, and negative voltage inputs.
The devices will be available for OEM quantities in May 2025, with sample pricing at $3.0 per unit (excluding tax) through distributors DigiKey and Mouser, and additional distributors starting in February 2025. Evaluation boards will also be offered.
