Rohm launches compact smart switches
Devices replace mechanical relays and MOSFETs in automotive and industrial equipment applications
Rohm has released a new generation of 1 channel and 2 channel 40 V Intelligent (Smart) Low Side Switches: the BV1LExxxEFJ-C and BM2LExxxFJ-C series.
The two product families are designed for automotive and industrial applications. They are AEC-Q100 qualified and are suitable for systems such as car body control, engine and transmission control units, LED lighting modules or industrial PLC (programmable logic controllers).
The BV1LExxxEFJ-C and BM2LExxxFJ-C family of products are Intelligent Low Side Devices with integrated over-temperature, over-current and over-voltage protections, built-in diagnostic features and micro-controller feedback. They can switch currents for any type of resistive, capacitive or inductive loads.
When switching off an inductive load, the power MOSFET inside the smart switch needs to dissipate all the magnetic energy stored previously in the inductor’s magnetic field. During this time the device protects itself by actively clamping the voltage to a safe level. The power dissipated, generates heat that is distributed on the integrated power MOSFET’s surface.
Rohm’s new products are said to be the industry’s first to combine heat suppression with low ON resistance (difficult to achieve in a compact size), by optimally controlling the number of current-carrying channels using proprietary TDACC circuit and device technology. TDACC offers increased integration capability, allowing Rohm to report the industry’s first 2 channel 40mΩ (ON resistance) product in the compact SOP-J8 package.
A wide range of ON-resistance values (40/80/160/250mΩ) in both 1 channel and 2 channel configurations are offered to meet diverse customer needs. Furthermore, the contact discharge tolerance of all the products in the family is higher than that of other standard products. This adds to a safer operation inside various electronic equipment types.
