Automotive USB Charging Port Supply Reference Design with Charging Controller and Cable Compensation (PMP9765)
This reference design includes a power management circuit which is capable of controlling a remote USB charging port in an automotive application environment. The circuit can be supplied directly from the car battery rail. It uses a small and highly efficient step down converter, the TPS62130A-Q1, to regulate the required USB bus voltage for charging with charge currents up to 2.5A. The USB charging port is controlled and protected by using a USB charging controller, the TPS2549-Q1, this charging controller is also used to monitor the charge current for adjusting the output voltage of the TPS62130A-Q1. This way the voltage drop across the cable connection to the USB port is compensated. In addition, the TPS2549-Q1 generates all required signals to indicate a USB charging port to the equipment connected to the port.
Complete power solution for a remote USB charging port Input overvoltage protection for surge voltages up to 40V Supports charge currents up to 2.5A Integrated cable voltage drop compensation for 1% accurate load regulation Up to 92% efficiency at full output power Less than 450-mm² PCB area required for the complete solution
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