Deer Team,
Need your help.
Here is a question from my customer. They have a Type-C charging and discharging product that uses the BQ25703A. When charging, the 5V charger charges the 12V battery pack, and when discharging, the 12V battery pack is stepped down to 5V to supply power to the load.
Question: When discharging, the 12V battery pack is stepped down to 5V to supply power to the load. At this time, the power supply VBUS of IC BQ25703A should have no power. Is it necessary to pull a separate power supply to supply power to Vbus, or the IC can also supply power with other pins?
My answer: There is no need to pull another power supply to supply power to VBUS. When the adapter is not connected, the chip takes power from the battery through the SYS pin. When the adapter terminal is connected to the load, it enters the OTG working mode, the converter starts to work, and outputs 5V voltage to the load. At this time, there is also a 5V power supply on the VBUS.
Is there something wrong with my answer. Is there a better way to answer this question?
Thanks,
Scott
