MB3874 Datasheet, PDF (19/28 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Parallel Charging

MB3874/MB3876
s NOTE ON AN EXTERNAL REVERSE-CURRENT PREVENTIVE DIODE
If there is an imbalance in charge current (I1, I2) under constant-voltage control, voltage is controled at the side
with a lower battery voltage and thus the battery voltage at one side is higher than that at the other by the voltage
difference between the reverse-current preventive diodes (D1, D2) and between the sense resistors (Rs1, Rs2)
Pay attention to the voltage/current characteristics of the reverse-current preventive diode (D1, D2) not to let it
exceed the overcharge stop voltage.
VCC
21
OUT
20
VH
19
VIN
(16 V/19 V)
to 24 pin to 1 pin
AB
I1
BATT1
RS1 ^{12.6 V/16.8 V}
D1
Battery 1
to 13 pin to 12 pin
CD
I2
BATT2
RS2 ^{12.6 V/16.8 V}
D2
Battery 2
19