MB3874 Datasheet, PDF (20/28 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Parallel Charging

MB3874/MB3876
s APPLICATION EXAMPLE
R10
∗2
R11
30 kΩ
−INE1
6800 pF ⁸
C8
R8
47 kΩ
FB1
7
3900 pF
−INE2
3
C9 ^+INC1
R16
A 24
22 kΩ
B1
R14
R9 −INC1
5.6 kΩ
150 kΩ ₄
R19
0.1 µF +INE2
200 kΩ
C13
FB2
Q2
SW1
2
3900 pF
33 kΩ
R12
C7
R17
−INE3
10
+INC2
C 13
22 kΩ
D 12
R18
200 kΩ
R15
5.6 kΩ
Q3
R7 −INC2
150 kΩ ₉
0.1 µF +INE3
C12
FB3
11
VIN ^SW2
∗3
33 kΩ
R13
−INE4
16
C6
3900 pF
R4
200 kΩ
−INE5
14
C5
3900 pF
R3
200 kΩ
FB4
15
<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
−
+
∗1
50 kΩ
∗1
50 kΩ
<SOFT>
VREF
1 µA
<Error
Amp.4>
VREF
−
+
+
<Error
Amp.5>
VREF
−
+
+
VREF
(4.2 V)
<MASK Comp.>
−
+
2.5 V
(2.8 V)
R6
330 kΩ
18
OUTM
VCC
<PWM
Comp.>
++++−
<OUT>
Drive
VCC
21
C14
0.1 µF
OUT
20
C1 C2
22 µF 22 µF
++
−−
C10
0.1 µF
Pin 24 Pin 1
Q1
AB
VCC
L1
Bias voltage
VH
19
block
(VCC − 5 V)
27 µH
C3
100 µF
+
<VH>
D1
−
I1
BATT1
RS1 ^∗4
C4 ^{D2 0.075Ω}
100 µF
+
− ^{Battery 1}
<UVLO>
VCC
(VCC UVLO) 215 kΩ
35 kΩ
0.91 V
(0.77 V)
VREF
ULVO
Pin 13 Pin 12
CD
I2
BATT2
RS2 ^∗4
0.075Ω
D3
Battery 2
CS
2200 pF
CS
22
2.5 V
1.5 V
<OSC>
(45 pF)
bias
<Ref>
<CTL>
17
5
RT VREF
RT 47 kΩ
23
GND
CTL
6
∗1 : MB3874 100 kΩ
MB3876 150 kΩ
∗2 : MB3874 22 kΩ
MB3876 15 kΩ
∗3 : MB3874 16 V
MB3876 19 V
∗4 : MB3874 12.6 V
MB3876 16.8 V
20