MB3881 Datasheet, PDF (4/40 Pages) Fujitsu Component Limited. – 8-ch DC/DC Converter IC with Synchronous Rectifier for Voltage Step-up and Step-down

MB3881
(Continued)
Pin No.
4
5
6
7
CH8
8
3
2
64
33
OSC
34
35
28
29
Control ₃₀
31
26
32
27
58
59
49
63
Power 52
24
36
25
55
1
Symbol
FB8
−IN8
+IN8
−IN8 (C)
+IN8 (C)
DTC8
RB8
OUT8
RT
CT
SYNC
CTL-1
CTL-2
CTL-3
CTL-4
CSCP
CS
VCC
VCC (O) -1
VCC (O) -2
VSS (O) -1
VSS (O) -2
VDD (O)
VREF
VB
GND
GND (O) -1
GND (O) -2
I/O
Descriptions
O Error amplifier output pin.
I Error amplifier inverted input pin.
I Error amplifier non-inverted input pin.
I Short detection comparator inverted input pin.
I Short detection comparator non-inverted input pin.
I Dead time control pin.
 Output current setting pin.
O Output pin.
 Triangular wave frquency setting resistor connection pin.
 Triangular wave frquency setting capacitor connection pin
I External synchronous signal input pin.
Power supply, CH 1, 3, 4, 8 control circuit.
I “H” level : Power supply operating mode
“L”level : Standby mode
CH 2 control circuit.
I
•CTL-1pin = “H” level
“H” level : CH2 operating mode
“L” level : CH2 OFF mode
CH5, 6 control circuit.
I
•CTL-1pin = “H” level
“H” level : CH5, CH6 operating mode
“L” level : CH5, CH6 OFF mode
CH7 control circuit.
I
•CTL-1pin = “H” level
“H” level : CH7 operating mode
“L” level : CH7 OFF mode
 Short protection circuit capacitor connection pin.
 CH1, 2, 3, 4, 7 soft start circuit capacitor connection pin.
 Reference voltage and control circuit power supply pin.
 CH1, 2, 3, 4 output circuit power supply pin.
 CH5, 6, 7, 8 output circuit power supply pin.
 CH1, 2, 3, 4 output circuit power supply pin.
 CH5, 6, 7 output circuit power supply pin.
 CH1, 2 synchronous rectifier side output circuit power supply pin.
O Refernce voltage output pin.
O Triangular wave oscillator regulator output pin.
 Ground pin.
 CH1, 2, 3, 4 output circuit ground pin.
 CH5, 6, 7, 8 output circuit ground pin.
4