MB39A125 Datasheet, PDF (47/64 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion Battery

MB39A125/126
■ APPLICATION EXAMPLE 2
• MB39A126
VIN
(8 V to
25 V)
Q2
R14
15 kΩ
IIN
R17
51
RS1
kΩ 0.015
R18 ^Ω
24
kΩ
R15
68 kΩ
R16
10 kΩ
ACIN
7
ACOK
5
XACOK
18
R12
30 kΩ
R13
20
kΩ
R9
36 kΩ
R11
1.1
kΩ
SW2
R10
20 kΩ
C13
22 pF
C8
6800 pF
R6
10 kΩ
A
B
−INE1
R5
8
100 kΩ
10
OUTC1
+INC1 13
12
−INC1
<Current Amp 1>
VREF
+
<Error Amp 1>
−ײ⁰
−
+
+INE1
9
C10
6800
pF
R7
10 kΩ
R3
33
kΩ
C6
2200 pF
−INE2
4
R8
100 kΩ
2
OUTC2
24
+INC2
1
−INC2
3
+INE2
15
FB123
C14
47 pF
16
−INE3
<Current Amp 2>
<Error Amp 2>
−
+
−ײ⁰
+
R1
<Error Amp 3>
−
R2
+
4.2 V/3.15 V
<AC Comp.>
+
−
0.2 V <UV Comp.>
+
−
−INC1
(Vo)
<PWM Comp.>
+
−
<OUT>
Drive
VCC
21
C12 C7
0.1
µF _0.1
µF
20
OUT
−2.5 V
−1.5 V
VH
VH
(VCC − ¹⁹
6 V)
Bias
Voltage
<UVLO>
VREF
UVLO
SEL 11
Hi : 4 Cells
Lo : 3 Cells
VREF ^<SOFT>
10 µF
C11
0.22 µF
CS
22
Slope
Control
<OSC>
500 kHz Max
4.2 V
Bias
VCC
<REF> <CTL>
RT ¹⁷
R4
47 kΩ
CT
(45 pF)
VREF
5.0 V
6
VREF
GND ²³
C9
0.22
µF
CTL
14
to System
C15
0.22 µF
R20
56 kΩ _R19 100 kΩ
Q3
C1
10 µF
Q1
L1
15 µH
D1
C3
10 µF
AB
ICHG
RS2
0.033
Ω
C4
10 µF
Battery
47