MB39A125 Datasheet, PDF (34/64 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion Battery

MB39A125/126
■ AC ADAPTER DETECTION FUNCTION
When ACIN terminal (pin 7) voltage is lower than 1.3 V (Typ) , AC adapter voltage detection block (AC Comp.)
outputs “Hi-Z” level to the ACOK terminal (pin 5) and outputs “L” level to the XACOK terminal (pin 18) . When
CTL terminal (pin 14) is set to “L” level, ACOK terminal (pin 5) and XACOK terminal (pin 18) are fixed to “Hi-Z” level.
(1) AC adapter presence
If you connect as shown in the figure below the presence of AC adapter can be easily detected because the
signal is output from the ACOK terminal (pin 5) to microcomputer etc. In this case, if the CTL terminal is set to
“L” level, IC becomes the standby state (ICC = 0 µA Typ).
• Connection example of detecting AC adapter presence
AC adapter
ACIN
7
<AC Comp.>
+
−
micon
ACOK
5
XACOK
18
34