MB3874 Fujitsu Media Devices, MB3874 Datasheet - Page 5

• Manufacturer Part Number: MB3874
• Description: DC/DC Converter IC for Parallel Charging
• Manufacturer: Fujitsu Media Devices

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