Rohm has developed new smart switches optimised for zonal controllers
Rohm has developed six new high-side Smart Switches (Intelligent Power Devices, short: IPDs) BV1HBxxxEFJ series (BV1HB008EFJ-C, BV1HB012EFJ-C, BV1HB020EFJ-C, BV1HB040EFJ-C, BV1HB090EFJ-C, BV1HB180EFJ-C) with accurate current sensing capability and ON resistances from 9 mΩ to 180 mΩ. They are ideal for protecting loads and subsystems from abnormalities such as overcurrent, overvoltage, and overtemperature, ensuring reliable operation and safeguarding sensitive components in automotive lighting, body control such as, door locks and power windows. Extensive diagnostic capabilities, e.g., open load and reverse battery detection, further enhances safety and reliability.
Vehicle electronic control systems are becoming increasingly sophisticated with the advancement of autonomous driving and electric vehicles (EVs). This evolution has heightened the importance of electronic protection from a functional safety standpoint, driving the shift toward Zonal Controllers architecture that manages vehicle functions in designated zones. As a result, the use of smart switches for electronic load protection and control is rapidly growing.
Zonal controllers must each manage a large number of loads, but conventional smart switches often lack the drive capability required for high-capacitance loads. Rohm’s new smart switches address this challenge, delivering key performance attributes such as low ON resistance and high inductive energy clamp while significantly improving capacitive load drive capability. By commercialising high-performance smart switches tailored to zonal controllers’ requirements, Rohm is contributing to automotive electrification and the elimination of mechanical fuses.
The new products feature high-capacitance load driving capability, maximising performance at the critical interface between Zonal Controllers and output loads (including various ECUs). Leveraging proprietary process technology makes it possible to achieve both low ON resistance and high inductive energy clamp – two characteristics typically involve a trade-off. The result is a well-balanced integration of three key performance metrics: drive capability, ON resistance, and energy tolerance. This enhances system design safety, efficiency, and reliability. The devices also incorporate high-precision current sensing function (±5%) that provides effective protection for harnesses connected to output loads. At the same time, the compact, high heat dissipation HTSOP-J8 package ensures design versatility.
