MB39A132QN-G-ERE1 Datasheet, PDF (25/56 Pages) Fujitsu Component Limited. – ASSP For Power Management Applications (Rechargeable Battery) Synchronous Rectification DC/DC Converter IC for Charging Li-ion Battery

MB39A132
■ SETTING DYNAMICALLY-CONTROLLED CHARGING
With the connection shown below, when the voltage of the AC adapter (VIN) drops and reaches Vth, the result
of the equation shown below, the converter becomes dynamically-controlled charging mode and then controls
charge current to maintain a constant power level of the AC adapter.
AC adapter voltage in dynamically-controlled-charging mode: Vth
Vth = [(1 −
1
Av
×
R4
R3 + R4
)VREF + 3 mV] ×
R1 + R2
R2
VREF = Reference voltage(5.0 V Typ), AV = Current detection amplifier block voltage gain (25.0 Typ)
VIN
R1
R2
VREF(5 V)
R3
R4
-INE1
9
OUTC1
10
+INC1
3
-INC1
2
ADJ1
7
<Current Amp1>
<Error Amp1>
DS04–27265–3E
25