June 11, 2025 /SemiMedia/ — ROHM has introduced two new series of high-accuracy current sense amplifiers qualified under AEC-Q100: the BD1423xFVJ-C and BD1422xG-C. These devices are designed to meet the evolving needs of automotive applications, especially in the context of electric vehicle power architectures.

The BD1423xFVJ-C series, offered in a TSSOP-B8J package, supports input voltages up to +80V. This makes it well-suited for high-voltage systems including 48V DC-DC converters, redundant power supplies, auxiliary battery modules, and electric compressors. The series comes in three gain variants: BD14230FVJ-C, BD14231FVJ-C, and BD14232FVJ-C.

For compact, lower-voltage applications, the BD1422xG-C series, housed in a small SSOP6 package, supports up to +40V input. This lineup is ideal for current monitoring and overcurrent protection in 5V/12V power supply networks used in automotive body and drivetrain systems. It also features three gain options: BD14220G-C, BD14221G-C, and BD14222G-C.

With the increasing adoption of 48V power systems and electric vehicles, precise current sensing has become essential for ensuring safety and performance. ROHM addresses this demand by integrating key analog sensing components—traditionally implemented using discrete op-amps—into a single chip that requires only a shunt resistor for operation.

The amplifiers use a two-stage architecture consisting of a chopper amplifier at the input and an auto-zero amplifier at the output. Built-in resistor matching for gain setting ensures stable accuracy (±1%) across temperature changes. Additionally, detection accuracy remains high even when using external RC filters for noise suppression, simplifying circuit design and reducing development effort.

A key feature of both series is their tolerance for negative voltages down to -14V, enabling them to withstand reverse connections and back-EMF conditions in automotive environments.

Availability: May 2025 (OEM quantities)
Pricing: $3.00 per unit (samples, excluding tax)