MB3874 Fujitsu Media Devices, MB3874 Datasheet - Page 20

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

20
MB3874/MB3876
APPLICATION EXAMPLE
R19
200 k
R18
200 k
Q2
Q3
VIN SW2
3
SW1
R14
5.6 k
R15
5.6 k
R11
30 k
R17
22 k
R16
22 k
33 k
R12
33 k
R13
C6
3900 pF
R10
R4
200 k
2
0.1 F
C13
0.1 F
C12
3900 pF
3900 pF
C
2200 pF
S
C9
R9
150 k
C7
R7
150 k
R8
47 k
6800 pF
C8
3900 pF
200 k
A
B
C
D
R3
INE3
INE3
INE4
INE5
C5
INE2
INC1
INE2
INC2
INE1
INC2
INC1
FB2
FB3
FB4
FB1
CS
24
10
13
12
11
16
14
15
22
8
7
3
1
4
2
9
<SOFT>
VREF
V
<Current Amp.1>
50 k
<Current Amp.2> <Error
CC
1
50 k
1 A
1
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
R
T
17
47 k
<PWM
VREF
Comp.>
bias
(V
<Ref>
<MASK Comp.>
Bias voltage
block
(2.8 V)
CC
V
2.5 V
5
CC
<UVLO>
UVLO)
<VH>
ULVO
VREF
V
(0.77 V)
<OUT>
0.91 V
CC
GND
<CTL>
215 k
23
35 k
Drive
(V
CC
V
CC
5 V)
18
20
19
21
6
C14
0.1 F
V
OUT
OUTM
CTL
VH
CC
1 :
2 :
3 :
4 :
R6
330 k
D1
MB3874 100 k
MB3876 150 k
MB3874 22 k
MB3876 15 k
MB3874 16 V
MB3876 19 V
MB3874 12.6 V
MB3876 16.8 V
27 H
C1
22 F
Q1
L1
C3
100 F
C2
22 F
C4
100 F
C10
0.1 F
Pin 13 Pin 12
Battery 2
Battery 1
I2
D3
I1
D2
Pin 24 Pin 1
A
C
0.075
0.075
R
R
S2
S1
D
B
BATT2
BATT1
4
4