MB3874 Datasheet, PDF (5/28 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Parallel Charging

MB3874/MB3876
s BLOCK DIAGRAM
−INE1
8
FB1
7
−INE2
3
+INC1
24
−INC1
1
+INE2
4
FB2
2
−INE3
10
+INC2
13
−INC2
12
+INE3
9
<Error Amp.1> VREF
−
208 kΩ
VCC
+
42 kΩ
<Current Amp.1>
+ 100 kΩ
× 25
−
<Error
Amp.2>
VREF
−
+
<Current Amp.2>
+ 100 kΩ
× 25
−
<Error
Amp.3>
VREF
−
+
FB3
11
−INE4
16
R1
∗
R2
50 kΩ
−INE5
14
R1
∗
R2
50 kΩ
<Error
Amp.4>
VREF
−
+
+
<Error
Amp.5>
VREF
−
+
+
FB4
15
<SOFT>
VREF
1 µA
VREF
(4.2 V)
<MASK Comp.>
−
+
2.5 V
OUTM
18
VCC
<PWM
Comp.>
++++−
<OUT>
Drive
VCC
21
OUT
20
VCC
Bias voltage
VH
19
block
<VH> ^{(VCC − 5 V)}
<UVLO>
VCC
(VCC UVLO) 215 kΩ
35 kΩ
0.91 V
(0.77 V)
VREF
ULVO
CS
22
2.5 V
1.5 V
<OSC>
(45 pF)
bias
<Ref>
<CTL>
CTL
6
17
5
23
RT VREF
GND
∗ : MB3874 100 kΩ
MB3876 150 kΩ
5