The TPS254900A-Q1 device is a USB charging controller and power switch which integrates D+ and D– short-to-battery protection, cable compensation, current monitor (IMON), and IEC ESD protection suitable for automotive USB charging and USB port protection applications.

The integrated power distribution switch uses N-channel MOSFETs suitable for applications where short circuits or heavy capacitive loads will be encountered. The device allows the user to adjust the current-limit thresholds using external resistors. The device enters constant-current mode when the load exceeds the current-limit threshold.

The TPS254900A-Q1 device provides V_BUS, D+, and D– short-to-battery protection. This protects the upstream voltage regulator, automotive processor, and hub when these pins are exposed to fault conditions.

The device also integrates CDP mode, defined in the BC1.2 specification, to enable up to 1.5-A fast charging of most portable devices during data communication.

The TPS254900A-Q1 device integrates a cable compensation (CS) feature to compensate for long-cable voltage drop. This keeps the remote USB port output voltage constant to enhance the user experience under high-current charging conditions.

The TPS254900A-Q1 device provides a current-monitor function (IMON) by connecting a resistor from the IMON pin to GND to provide a positive voltage linearly with load current. This can be used for system power or dynamic power management.

Additionally, the device provides ESD protection up to ±8 kV (contact discharge) and ±15 kV (air discharge) per IEC 61000-4-2 on DP_IN and DM_IN.