MB39A125 Datasheet, PDF (36/64 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion Battery

MB39A125/126
(3) Battery selector function
When control signal from microcomputer etc. is input to ACIN terminal (pin 7) as shown in the following diagram,
ACOK terminal (pin 5) output voltage and XACOK terminal (pin 18) output voltage are controlled to select one
of the two batteries for charge. Connect CTL terminal (pin 14) to VCC terminal (pin 21) for this function. OFF
duty cycle becomes 100% when CS terminal (pin 22) voltage is made to be 0 V, if it is needed after full charge.
• Connection example of battery selector function
System
AC adapter
micon
ACIN
7
ACOK XACOK
5
18
<AC Comp.>
+
VCC
21
CTL
14
−
< SOFT>
VREF
CS
22
10 µA
AB
ICHG
RS1
Battery1
Battery2
36