Four high-side channels with SPI diagnostic readback
The Infineon BTS54040LBFAUMA1 is a four-channel high-side power switch in the Automotive Series, built for driving resistive, inductive, and capacitive loads in 12 V and 24 V vehicle electrical systems. Each of the four N-channel outputs is rated for 2 A continuous with a typical on-resistance of 39 mOhm, keeping conduction losses low enough that the PG-TSON-24-3 package can dissipate the heat without a large copper pour.
Load voltage range and junction temperature envelope
The switch handles a load supply from 5.5 V up to 28 V, covering nominal 12 V and 24 V truck/off-highway architectures with margin for load-dump transients. Fault protection includes fixed current limiting, over-temperature shutdown, and over-voltage clamping — no external TVS needed on the output for inductive load turn-off.