Quad high-side switch with diagnostic feedback
The Infineon BTS5440GNT is a four-channel N-channel high-side power switch from the IntelliSense™ family. Each output delivers up to 5.7 A continuous, with a typical on-resistance of 21 mOhm.
At 5.7 A per channel, the conduction loss is I²R = 0.68 W per channel, or 2.7 W if all four channels are on simultaneously. The PG-DSO-28-19 package (a 28-pin SOIC wide-body, 7.50 mm width) dissipates that through the copper pad on the PCB — a 2 oz copper pour under the package is the practical heatsink. The 150°C junction rating gives headroom for high ambient temperatures common in engine bay or industrial cabinet environments.
Fault protection that reduces external BOM
Integrated fault protection covers current limiting (fixed threshold, not adjustable), open-load detection, over-temperature shutdown, and over-voltage clamping. The over-voltage clamp handles transients up to the 28 V load supply maximum.
Obsolete — sourcing through independent distribution
Infineon lists the BTS5440GNT as obsolete.