MB3878 Datasheet, PDF (4/24 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging

MB3878
s BLOCK DIAGRAM
−INE1 8
OUTC1 10 _{<Current Amp.1>}
+INC1 13
+
× 25
−INC1 12
−
+INE1 9
FB1 7
−INE2 4
OUTC2 2 _{<Current Amp.2>}
+INC2 24
+
× 25
−INC2 1
−
+INE2 3
<Error
Amp.1>
VREF
−
+
<Error
Amp.2> ^VREF
−
+
<PWM Comp.>
<OUT>
++
+−
Drive
21 VCC (O)
20 OUT
VCC
Bias
19 VH
Voltage _{(VCC − 5 V)}
<VH>
FB2 5
−INE3 ¹⁶
OUTD 11
FB3 15
<SOFT>
VREF
1 µA
CS 22
<Error
Amp.3>
VREF
−
+
+
4.2 V
<OSC>
(45 pF)
17
RT
2.5 V
1.5 V
<UVLO> _VCC
(VCC UVLO)215 kΩ
35 kΩ
0.91 V
(0.77 V)
VREF
UVLO
VCC
bias
<REF> <CTL>
VREF
6 ^{5.0 V} 23
VREF GND
18 VCC
14 CTL
4