MB39A132QN-G-ERE1 Datasheet, PDF (18/56 Pages) Fujitsu Component Limited. – ASSP For Power Management Applications (Rechargeable Battery) Synchronous Rectification DC/DC Converter IC for Charging Li-ion Battery

MB39A132
(10) Power supply control block (CTL1)
The power supply control block controls the DC/DC converter operation. When the CTL1 pin (pin 23) is set
to "L" level, the DC/DC converter enters standby mode. In the standby mode, only the AC adapter detection
function is operable. (The typical supply current value is 6 μA in the standby mode.)
CTL1 function table
CTL1
DC/DC converter
control
AC adapter detection
L
OFF (Standby)
ON (Active)
H
ON (Active)
ON (Active)
(11) Current Amp1 control block (CTL2)
The Current Amp1 controller controls the Current Amp1 operation. When the CTL2 pin is set to "H" level,
the Current Amp1 becomes operable.
When the CTL1 pin (pin 23) is set to the "L" level and the CTL2 pin (pin32) is set to the "H" level after full-
charge, only Current Amp1 and the AC adapter detection function becomes operable.
CTL2 function table
CTL2
Current Amp1
L
OFF (Standby)
H
ON (Active)
AC adapter detection
ON (Active)
ON (Active)
(12) Bias voltage block (VB)
The bias voltage block outputs 5 V (Typ) for the power supply of the output circuit and for setting the bootstrap
voltage.
(13) Off time control block (Off Time Control)
When this IC operates by high on-duty, voltage of both ends of bootstrap capacitor CB is decreasing
gradually. In such the case, off time control block charges with CB by compulsorily generating off time
(0.3 μs Typ).
18
DS04–27265–3E