The Texas Instruments BQ24392RSER is a USB multi-function controller that handles the physical-layer interface and control logic for a USB port. It integrates the termination resistors, current-limit switch, and detection logic needed for USB BC1.2 charging and data handshake — a single-chip solution that replaces a discrete resistor-divider and FET array. The 10-UQFN package measures 2.0x1.5 mm, which fits into space-constrained portable designs — phone chargers, battery packs, IoT endpoints, and handheld instruments where board area is the binding constraint.
Industrial temperature range — what it buys you
That covers outdoor telecom cabinets, factory-floor USB programming ports, and automotive cabin-zone chargers (non-AEC, so not for under-hood or safety-rated paths). The 85°C ceiling is the derating anchor for the current-limit switch — at 85°C the internal FET's Rds(on) rises, reducing the available output current before the thermal-shutdown threshold.