IP5389

V1.23

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Charge while discharging

When the charging power supply and the electrical device are plugged in at the same time, the chip

will automatically enter the charging and discharging mode. In this mode, it will automatically close the

internal fast charging input request. When the VIO voltage is only 5V, the discharging path is opened to

supply power to the electrical device; if the VIO voltage is greater than 5.6V, for safety reasons, the

discharging path will not be opened. In order to charge the electrical device normally, IP5389 will increase

the charging undervoltage loop to above 4.925V to ensure that the electrical device is given priority to

supply power.

During the charging and discharging process, if the charging power is unplugged, IP5389 will turn off

the charging and restart discharging to supply power to the electrical device. For safety reasons, and to

reactivate the mobile phone to request fast charging, the voltage will drop to 0V for a period of time during

the conversion process.

During the charging and discharging process, if the electrical device is unplugged, or the electrical

device is fully charged and stops drawing power, the corresponding discharging path will be automatically

closed after about 16s. When the discharging paths are closed and the state returns to the charging only

mode, the charging undervoltage loop will be lowered and the fast charging will be automatically

reactivated, then the charging of the mobile power supply will be accelerated.

12.8

Automatic Detection for Mobile Phone

12.8.1

Automatic detection for mobile phone insertion

If an inserted phone has been automactically detected by IP5389, IP5389 will wake up from standby

state immediately and turn on the boost to charge the phone by 5V. This design can save the step of

turning on the key and support the mold scheme without key.

12.8.2

Automatic detection for fully charged mobile phone

IP5389 samples the output current of each port through the on-chip ADC. When the output current of

a single port is less than about 80mA (MOS Rds_ON@10mohm) and lasts for about 16s, the output port

will be closed. When the total output power is less than about 350mW and lasts for about 32s, it is

considered that the mobile phones of all output ports are fully charged or unplugged, and the buck-boost

output will be automatically turned off.