IP5389

V1.23

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12

Description of Function

12.1

Lock State and Activation

When the IP5389 is connected to the battery for the first time, no matter what the battery voltage is,

the chip is in a lock state, and the lowest digit of the battery indicator will flash 4 times, or the nixie tube 0%

will flash 4 times to indicate. When not in the charging state, if the battery voltage is too low, the shutdown

will be triggered, and IP5389 will go into lock state at this time.

In the low battery state, in order to reduce static power consumption, IP5389 can’t detect the insertion

of the load and it can’t be activated by pressing the key. At this time, pressing the key can’t activate the

buck-boost output, but the lowest battery indicator will flash 4 times to prompt.

In the lock state, the chip can be activated only after entering the charging state.

12.2

Charging

IP5389 has a constant current and constant voltage lithium battery charging management system that

supports a synchronous switch structure. It can automatically match different charging voltage.

When the battery voltage is less than VTRKL, it will apply 200mA trickle charging; when the battery

voltage is greater than VTRKL, it will apply constant current charging, and the maximum charging current of

the battery terminal is 8.0A; when the battery voltage is close to the setting value, it will apply constant

voltage charging; when the battery terminal charging current is less than the stop charging current ISTOP

and the battery voltage is close to the constant voltage, the charging is stopped. After the charging is

completed, if the battery voltage is lower than (VTRGT-N*0.1)V, it will restart the battery charging.

IP5389 has switch charging technology with a switching frequency of 250kHz. When charging with

ordinary 5V input, the input power is 10W; when charging with fast charging input, the maximum input

power is 100W. The charging efficiency can reach 96%, which can shorten the charging time by 3/4.

IP5389 will automatically adjust the charging current to adapt to adapters with different load capacities.

IP5389 supports simultaneous charging and discharging. When charging and discharging

simultaneously, both input and output are 5V.

12.3

Discharging

IP5389 integrates a synchronous switching converter system that supports high-voltage output and

supports a wide voltage range of 3.0V~21V. The synchronous switching buck-boost system can provide a

maximum output capacity of 100W. The built-in soft-start function prevents malfunctions caused by

excessive inrush current during start-up.It also has output overcurrent, short circuit, overvoltage,

overtemperature and other protective functions to ensure the stable and reliable operation of the system.

The current of the discharging system can be automatically adjusted with the temperature to ensure

that the IC temperature is below the set temperature.

VBAT = 8V，VOUT = 5/9/12/15V，the boost efficiency curve is as follows：