The LT8698S is a compact, high efficiency, synchronous monolithic step-down switching regulator designed to power the 5V USB VBUSrail with up to 3A from an input voltage as high as 42V. Programmable cable drop compensation maintains accurate 5V VBUSregulation even for USB sockets separated from the LT8698S by a long cable such as an automobile wiring harness. Silent Switcher Technology and selectable spread-spectrum modulation provide ultralow EMI/EMC.The LT8698S supports a wide variety of portable device charger profiles including USB BC 1.2 CDP, DCP, and SDP as well as common proprietary profiles. Integrated VBUSreset and VBUSregulator disable functions support USB OTG functionality.The LT8698S’s robust high speed USB 2.0 data line switches protect the upstream USB host μController from short-circuit conditions up to 20V and ESD events up to IEC61000-4-2 8kV contact discharge and 15kV air discharge levels. Further VBUSmonitor and fault protection features eliminate the need for a USB power switch. The LT8698S includes two parallel 10nF capacitors from VINto PGND for improved EMI/EMC performance. The LT8698S-1 does not include these capacitors.APPLICATIONSAutomotive USBIndustrial USB