Automotive low-side switches control 40V

Author: EIS Release Date: Feb 15, 2023

Rohm has released one and two channel 40V low-side switches with AEC-Q100 qualification for automotive and industrial use.

 

Rohm BM2LE040FJ-C low-side automotive switch

BV1LExxxEFJ-C (single-channel, 4.9 x 6 x 1mm HTSOP-J8) and BM2LExxxFJ-C (dual-channel, 4.9 x 6 x 1.65mm SOP-J8) “are suitable for systems such as car body control, engine and transmission control units, LED lighting modules or industrial programmable logic controllers”, according to the company.

 

They operate over 3 to 5.5V and -40 to +150°C (Tj), with up to 40V feeding the load, and integrate over-temperature, over-current and over-voltage protections, and built-in diagnostic feedback to a host micro-controller. Feedback is through an open-drain output – one for each channel in the two channel devices.

 

Resistive, capacitive or inductive loads can be switched, and there is internal active clamping to control voltage spikes when inductors are switched off.

 

Different versions of the devices have a channel on-resistance of 40, 80, 160 or 250mΩ.

 

Taking the dual channel 40mΩ BM2LE040FJ-CE2 as an example, it can carry 17.5A per channel and clamp 250mJ (25°C 2.5A initial, 85mJ at 150°C) . Typical consumption is 100µA.