SW6208

Bidirectional Fast Charge Power Bank

Copyright © 2022, ZHUHAI ISMARTWARE TECHNOLOGY CO., LTD.

May, 2022 - DS046_v1.5

9

rises to target charge voltage, charger enters into constant voltage charge while charge current falls

so as battery voltage stays to target voltage. When charge current falls to termination charge current,

charge cycle completes and charger stops. When battery voltage is lower than recharge threshold,

charger automatically restarts.

VTC

VBAT_FULL

ITC

IEND

ICC

Trickle

charge

CC

charge

CV

charge

The battery target voltage can be set by FLED/BSET pin. When FLED/BSET is pulled up to VCC with

a 10KΩ resister, 4.2V is set; when selecting a 15KΩ resister, 4.35V is set; when selecting a 5.6KΩ

resister, 4.4V is set; when selecting a 3KΩ resister, 4.5V is set.

The charge current in input current varies with input voltage, while battery current is up to 5A. When

input voltage is 5V, input charge current is set to 2A for Micro-B and Lightning port, and 3A for Type-

C port. When input voltage is 9V, input charge current is set to 2A. When input voltage is 12V, input

charge current is set to 1.5A.

The switching charger has battery temperature protection and support JEITA. It monitors battery

temperature by measuring the voltage of NTC pin which connects to a negative temperature coefficient

(NTC) thermistor. When battery temperature is abnormal,charger will reduce charge current, reduce

target charge voltage or stop to protect battery.While using a typical NTC thermistor of 103AT, When

battery temperature is lower than 5℃, charger will reduce charge current by half; When battery

temperature continues to fall to lower than 0℃, charger will stop; When battery temperature rises to

5℃, charger will restart and reduce charge current by half; When battery temperature continues to rise

to higher than 10℃, charge current will return to normal; When battery temperature is higher than

45℃, charger will reduce target charge voltage by 0.1V; When battery temperature continues to rise

to higher than 50℃, charger will stop; When battery temperature falls to 45℃, charger will restart and

reduce target charge voltage by 0.1V; When battery temperature continues to fall to lower than 40℃,

target charge voltage will return to normal. Resisters can be in series or parallel with the NTC

thermistor to change the protection temperature range. JEITA function can be disabled if not needing.

The switching charger integrates thermal regulation. When die temperature rises to the charge thermal

regulation threshold, charge current will automatically fall down so the die temperature stops

increasing. If temperature continues rising to thermal shutdown temperature, charger will stop and the