MB39A132QN-G-ERE1 Datasheet, PDF (21/56 Pages) Fujitsu Component Limited. – ASSP For Power Management Applications (Rechargeable Battery) Synchronous Rectification DC/DC Converter IC for Charging Li-ion Battery

MB39A132
3. Detection Function
AC adapter voltage detection block (AC Comp.)
When the AC adapter voltage detection block (AC Comp.) detects that ACIN pin (pin 4) voltage is below
1.25 V (Typ), it and sets ACOK pin (pin 5) in the AC adapter voltage detection block to Hi-Z. In addition,
power is supplied from the VCC pin (pin 1) or the VIN pin (pin 24), whichever has higher voltage.
This function operates regardless of the input level of the CTL1 pin (pin 23) and CTL2 pin (pin 32).
ACIN
H
L
ACOK
L
Hi-Z
AC adapter
R1
Microcontroller
ACIN
R2
4
ACOK
5
<AC Comp.>
AC adapter detection voltage setting
VIN = Low to High
Vth = (R1 + R2) / R2 × 1.25 V
VIN = High to Low
Vth = (R1 + R2) / R2 × 1.24 V
DS04–27265–3E
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