MB39A119 Datasheet, PDF (24/53 Pages) Fujitsu Component Limited. – DC/DC Converter IC of Synchronous Rectification for charging Li-ion battery

MB39A119
■ AC ADAPTER DETECTION FUNCTION
When ACIN terminal (pin 4) voltage is lower than 2.0 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 22) . When
CTL terminal (pin 21) is set to “L” level, ACOK terminal (pin 5) and XACOK terminal (pin 22) are fixed to
“Hi-Z” level.
(1) AC adapter presence
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 CTL terminal (pin 21) is set in “L” level, IC become the standby state (ICC = 0 µA Typ) .
• Connection example of detecting AC adapter presence
AC adapter
Micon
ACIN
4
<AC Comp.>
+
−
ACOK
5
XACOK
22
24