MB39A123 Datasheet, PDF (6/44 Pages) Fujitsu Component Limited. – 6 ch DC/DC Converter IC with Synchronous Rectification

MB39A123
■ BLOCK DIAGRAM
VIN
(5 V-11 V)
Step-down
(Synchronous
Rectification)
A
−INE1 ₃₈
L priority
VREF
Error
CS1 ₃₉
1.1 µA
− ^Amp1
+
+
FB1 ₃₇
(1.0 V)
PWM
Comp.1
+
−
<<ch.1>>
Io = 300 mA
at VCCO = 7 V
Drive1-1
P-ch
VCCO
36
OUT1-1
35
A
Vo1
(1.2 V)
Reference voltage
1.0 V ± 1 %
Drive1-2
N-ch
OUT1-2
34
Dead Time
(td = 50 ns)
Io = 300 mA
at VCCO = 7 V
Step-down
B
B
−INE2 ₄₁
L priority
VREF
Error
Max Duty ^{VREF L priority}
<<ch.2>>
CS2
40
1.1 µA
Amp2
−
+
+
92 % ± 5 %
PWM
Comp.2
+
+
−
Drive2
P-ch
OUT2
33
Vo2
(2.5 V)
FB2 ₄₂
DTC2 ₄₃
1.23 V
Reference voltage
1.23 V ± 1 %
Io = 300 mA
at VCCO = 7 V
Step-down
C
C
−INE3 ₄₆
L priority
VREF
Error
Max Duty ^{VREF L priority}
<<ch.3>>
CS3 ₄₇
1.1 µA
Amp3
−
+
+
92 % ± 5 %
PWM
Comp.3
+
+
−
Drive3
P-ch
OUT3
32
FB3 ₄₅
DTC3 ₄₄
1.23 V
Reference voltage
1.23 V ± 1 %
Io = 300 mA
at VCCO = 7 V
Vo3
(3.3 V)
D
−INA ₁₉
−
<<ch.4>>
+
OUTA
18
INVAmp
Inverting
D
−INE4
16
CS4 ₁₇
L priority
VREF
1.1 µA
Error
Amp4
−
+
+
Max Duty ^{VREF L priority}
92 % ± 5 %
PWM
Comp.4
+
+
−
Drive4
P-ch
OUT4
31
Vo4
(−7.5 V)
1.23 V
FB4 ₁₅
DTC4
14
Reference voltage
1.23 V ± 1 %
Io = 300 mA
at VCCO = 7 V
Step-up
E
21
−INE5
L priority
VREF
Error
Max Duty VREF ^{L priority}
<<ch.5>>
CS5 ₂₀
1.1 µA
Amp5
−
+
+
92 % ± 5 %
PWM
Comp.5
+
+
−
Drive5
N-ch
OUT5
30
E
Vo5
(15 V)
1.23 V
FB5 ₂₂
DTC5 ₂₃
Reference voltage
1.23 V ± 1 %
Io = 300 mA
at VCCO = 7 V
F
Transformer
F
−INE6 ₂₆
L priority
VREF
Error
Max Duty VREF ^{L priority}
<<ch.6>>
CS6 ₂₇
1.1 µA
− ^Amp6
+
+
92 % ± 5 %
PWM
Comp.6
+
+
−
Drive6
N-ch
OUT6
29
Vo6-1
(15 V)
Vo6-2
(5.0 V)
FB6 ₂₅
DTC6 ₂₄
1.23 V
Reference voltage
1.23 V ± 1 %
Io = 300 mA
at VCCO = 7 V
GNDO
28
Short-circuit
detection signal
(L: at short-circuit)
Charge current
1 µA
−INS
8
CSCP
13
H:ON
L:OFF
VTH = 1.0 V
CTL1 ²
CTL2 ³
CTL3 ⁴
CTL4 ⁵
CTL5 ⁶
CTL6 ⁷
CHCTL
VREF
SCP
− ^Comp.
1V
+
SCP
H:at SCP
0.9 V
0.4 V
OSC
H:UVLO release
UVLO1
UVLO2
bias
Error Amp power supply
SCP Comp. power supply
Error Amp
reference
1.0 V/1.23 V
VCC
48
VREF
VR
Power
ON/OFF
1 ^CTL
CTL
11 12
RT
CT
Precision ± 0.5 %
(2.0 MHz)
2.0 V
Precision
± 0.8 %
9
VREF
10
GND
Precision
±1%
H:ON (Power ON)
L:OFF(Standby mode)
VTH = 1.0 V
<< 48 Pin >>
PKG:BCC-48++
:LQFP-48P
6