MB39A112 Datasheet, PDF (19/35 Pages) Fujitsu Component Limited. – 3-ch DC/DC Converter IC

MB39A112
s APPLICATION EXAMPLE
R6 R7
2.2 kΩ 18 kΩ
A
CH1
R8
100 kΩ
ON/OFF signal
(L : ON, H : OFF)
C7
CTL1
0.1
µF
C8
0.022 µF
−INE1
2
CS1
1
R9
820 Ω
FB1
3
VREF
10 µA
L
priority
Threshold voltage
1.0 V ± 1 %
Error
− ^Amp1
+
+
1.0 V
PWM
Comp.1
+
−
CH1
Drive1
Pch
IO = 150 mA
VCCO
20
C17
0.1 µF
OUT1
19
Q1
C1
2.2 µF
R11 R12
4.7 kΩ 56 kΩ
B
CH2
R13
36 kΩ
ON/OFF signal
(L : ON, H : OFF)
C12
CTL2
0.1
µF
−INE2
9
VREF
10 µA
CS2
10
R14
820 Ω
L
priority
C11
0.01 µF
FB2
8
Threshold voltage
1.23 V ± 1 %
Error
− ^Amp2
+
+
1.23 V
PWM
Comp.2
+
−
CH2
Drive2
Pch
IO = 150 mA
OUT2
18
Q2
C3
2.2 µF
VIN
(12 V)
R15 R16
680 Ω 30 kΩ
C
CH3
R17
10 kΩ
ON/OFF signal
(L : ON, H : OFF)
−INE3
12
VREF
10 µA
CS3
11
C13
R18
CTL3
0.1
1 kΩ
µF
L
priority
C14
0.01 µF
FB3
13
Threshold voltage
1.23 V ± 1 %
Error
− ^Amp3
+
+
1.23 V
H
priority
PWM
Comp.3
+
−
CH3
Drive3
Pch
IO = 150 mA
OUT3
17
C16
0.1 µF
Charge
current
1 µA
CSCP
14
C15
1000 pF
SCP
Comp. +++
−
2.7 V
SCP
H: at SCP
2.5 V
2.0 V
H: UVLO release
OSC
UVLO
bias
3.5 V
VCCO − 5 V
VH
16
Bias
Voltage
VH
Error Amp Power Supply
SCP Comp. Power Supply
ErrorAmp Reference
1.0 V/1.23 V
GNDO
15
VCC
4
VREF
Power
VR ON/OFF
CTL
C9
0.1 µF
GND
5
RT
R10
5.1 kΩ
6
CT
C10
100 pF
7
GND
Q3
C5
2.2 µF
A
L1
2 µH
D1
Step-
down
VO1
(1.2 V)
IO1 = 0.8 ∼ 1.5 A
C2
4.7 µF
B
L2
3.3 µH
D2
Step-
down
VO2
(3.3 V)
IO2 = 0.15 ∼ 1 A
C4
4.7 µF
C
L3
10 µH
D3
Step-
down
VO3
(5.0 V)
IO3 = 0.15 ∼ 0.3 A
C6
4.7 µF
19