FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27222-1E
ASSP
For Power Supply Applications
6-ch DC/DC Converter IC
With Synchronous Rectification for voltage step-up and step-down
MB3827
s
DESCRIPTION
The MB3827 is a pulse width modulation (PWM) type 6-channel DC/DC converter IC with, synchronous rectifi-
cation for voltage step-up and step-down. The MB3827 is ideal for low voltage, high efficiency, compact applications
and for down conversion and up/down conversion (with two types of voltage step-up/step-down methods allowing
input/output relations to be set independently).
In addition the MB3827 features a built-in self-supply power channel (channel 7) providing a wide range of supply
voltages, and operates from two dry-cell batteries.
This product is ideal for high performance portable devices such as digital still cameras.
s
FEATURES
•
•
•
•
•
•
•
•
Compatible with step-up/step-down switching methods (channel 1)
Compatible with step-up/step-down Zeta methods (channels 2 to 6)
Synchronous rectification (channels 1 and 2)
Low start-up voltage : 1.8 V (channel 7 for self-power supply)
Power supply voltage range : 4 V to 13 V (channels 1 to 6)
Built-in high-precision reference voltage generator : 2.5 V±1%
Oscillator frequency range : 100 kHz to 800 kHz
Error amplifier output for soft start (channels 1 to 6)
s
PACKAGE
64-pin plastic LQFP
(FPT-64P-M03)
2
MB3827
GND(O)5,6,7
XENB1-6
OUT(A)6
-IN(C)6
-IN(A)6
-IN7-2
-IN7-1
OUT7
s
PIN ASSIGNMENT
DTC5
+IN7
RB7
-IN6
FB6
FB7
9
8
7
6
5
4
3
2
1
16
VCC(O)5,6,7
OUT6
OUT5
OUT4
OUT3
VSS(O)3,4,5,6
59
58
57
56
55
54
53
52
51
50
49
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
VCC(O)3,4
OUT2-2
GND(O)2,3,4
OUT2-1
VSS(O)1,2
VCC(O)1,2
OUT1-1
VG(O)1
OUT1-2
OUT1-3
15
14
13
12
11
10
DTC6
DTC7
-IN(C)5
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
60
61
62
63
64
-IN5
FB5
FB4
-IN4
DTC4
-IN(C)8
VREF
GND
VCC
CTL1-4,7
CTL5
CTL6
CS1-6
CSCP
VB
RT
CT
FB3
FB2
FB1
-IN3
-IN2
-IN1
RB1
DTC3
DTC2
DTC1-4
DTC1-3
DTC1-1
OUT1-4
GND(O)1
MB3827
s
PIN DESCRIPTION
Pin No.
45
44
43
42
CH 1
41
52
50
47
49
48
38
39
CH 2
40
55
57
37
CH 3
36
35
60
20
CH 4
21
22
61
19
18
CH 5
17
16
62
Symbol
FB1
–IN1
DTC1-1
DTC1-3
DTC1-4
OUT1-1
OUT1-2
RB1
OUT1-3
OUT1-4
FB2
–IN2
DTC2
OUT2-1
OUT2-2
FB3
–IN3
DTC3
OUT3
FB4
–IN4
DTC4
OUT4
FB5
–IN5
–IN(C)5
DTC5
OUT5
I/O
O
I
I
I
I
O
O
—
O
O
O
I
I
O
O
O
I
I
O
O
I
I
O
O
I
I
I
O
Descriptions
Channel 1 error amplifier output pin.
Channel 1 error amplifier inverted input pin.
Channel 1 step-down main side dead time control pin.
Channel 1 step-up main side dead time control pin.
Channel 1 step-up synchronous rectifier side dead time control pin.
Channel 1 step-down main side output pin.
Channel 1 step-down synchronous rectifier side output pin.
Channel 1 step-up main side output current setting pin.
Channel 1 step-up main side output pin.
Channel 1 step-up synchronous rectifier side output pin.
Channel 2 error amplifier output pin.
Channel 2 error amplifier inverted input pin.
Channel 2 dead time control pin.
Channel 2 main side output pin.
Channel 2 synchronous rectifier side output pin.
Channel 3 error amplifier output pin.
Channel 3 error amplifier inverted input pin.
Channel 3 dead time control pin.
Channel 3 output pin.
Channel 4 error amplifier output pin.
Channel 4 error amplifier inverted input pin.
Channel 4 dead time control pin.
Channel 4 output pin.
Channel 5 error amplifier output pin.
Channel 5 error amplifier inverted input pin.
Channel 5 short detection comparator input pin.
Channel 5 dead time control pin.
Channel 5 output pin.
(Continued)
3
MB3827
(Continued)
Pin No.
10
11
13
CH 6
12
14
15
63
CH 7
(for self power supply)
5
6
8
7
9
1
2
33
Symbol
–IN(A)6
OUT(A)6
FB6
–IN6
–IN4(C)6
DTC6
OUT6
FB7
–IN7-1
+IN7
–IN7-2
DTC7
OUT7
RB7
RT
I/O
I
O
O
I
I
I
O
O
I
I
I
I
O
—
—
Descriptions
Channel 6 inverted amplifier input pin.
Channel 6 inverted amplifier output pin.
Channel 6 error amplifier output pin.
Channel 6 error amplifier inverted input pin.
Channel 6 short detection comparator input pin.
Channel 6 dead time control pin.
Channel 6 output pin.
Channel 7 error amplifier output pin.
Channel 7 error amplifier 1 inverted input pin.
Channel 7 error amplifier non-inverted input pin.
Channel 7 error amplifier 2 inverted input pin.
Channel 7 dead time control pin.
Channel 7 output pin.
Channel 7 output current setting pin.
Triangular wave frequency setting resistor connection pin.
Triangular-Wave
Oscillator Circuit
34
CT
—
Triangular wave frequency setting capacitor connection pin.
Power supply control circuit pin.(channel 1 to 4 and 7)
“H” level: Power supply active mode
“L” level: Standby mode
Channel 5 control circuit pin.
When CTL1-4,7 pins
=
“H” level
“H” level: Channel 5 in active mode
“L” level: Channel 5 in standby mode
Channel 6 control circuit pin.
When CTL1-4,7 pins
=
“H” level
“H” level: Channel 6 in active mode
“L” level: Channel 6 in standby mode
Short detection comparator input pin.
Short protection circuit capacitor connection pin.
Soft start circuit capacitor connection pin (channel 1 to 6).
VREF control pin (channel 1 to 6 output control pin).
When CTL1-4, 7 pin = “H”
“H” level: VREF “L” level, channel 1 to 6 output “OFF”
“L” level: VREF “H” level, channel 1 to 6 output “active”
27
CTL1-4, 7
I
28
CTL5
I
Control
Circuit
29
CTL6
I
23
31
30
–IN(C)8
CSCP
CS1-6
I
—
—
4
XENB1-6
I
(Continued)
4
MB3827
(Continued)
Pin No.
26
53
58
64
54
Power Supply
Circuit
51
59
24
32
25
46
56
3
Symbol
VCC
VCC(O)1,2
VCC(O)3,4
VCC(O)5,6,7
VSS(O)1,2
VG(O)1
VSS(O)3,4,5,6
VREF
VB
GND
GND(O)1
GND(O)2,3,4
GND(O)5,6,7
I/O
—
—
—
—
—
—
—
O
O
—
—
—
—
Description
Reference voltage and control circuit power supply pin.
Output circuit power supply pin (Channel 1, 2).
Output circuit power supply pin (Channel 3, 4).
Output circuit power supply pin (Channel 5, 6, 7).
Main side output circuit power supply pin (Channel 1, 2).
Step-up synchronous rectifier side output circuit power supply pin
(Channel 1).
Output circuit power supply pin (Channel 3, 4, 5, 6).
Reference voltage output pin.
Triangular wave oscillator regulator output pin.
Ground pin.
Output circuit ground pin (Channel 1).
Output circuit ground pin (Channel 2, 3, 4).
Output circuit ground pin (Channel 5, 6, 7).
5
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