Description

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.