DS04-27222-1E
FUJITSU SEMICONDUCTOR
DATA SHEET
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.
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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)
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PACKAGE
64-pin plastic LQFP
(FPT-64P-M03)
MB3827
2
s
PIN ASSIGNMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
OUT7
RB7
GND(O)5,6,7
XENB1-6
FB7
-IN7-1
-IN7-2
+IN7
DTC7
-IN(A)6
OUT(A)6
-IN6
FB6
-IN(C)6
DTC6
DTC5
-IN(C)5
-IN5
FB5
FB4
-IN4
DTC4
-IN(C)8
VREF
GND
VCC
CTL1-4,7
CTL5
CTL6
CS1-6
CSCP
VB
OUT1-4
RB1
GND(O)1
FB1
-IN1
DTC1-1
DTC1-3
DTC1-4
DTC2
-IN2
FB2
FB3
-IN3
DTC3
CT
RT
VCC(O)5,6,7
OUT6
OUT5
OUT4
OUT3
VSS(O)3,4,5,6
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
MB3827
3
s
PIN DESCRIPTION
(Continued)
Pin No.
Symbol
I/O
Descriptions
CH 1
45
FB1
O
Channel 1 error amplifier output pin.
44
IN1
I
Channel 1 error amplifier inverted input pin.
43
DTC1-1
I
Channel 1 step-down main side dead time control pin.
42
DTC1-3
I
Channel 1 step-up main side dead time control pin.
41
DTC1-4
I
Channel 1 step-up synchronous rectifier side dead time control pin.
52
OUT1-1
O
Channel 1 step-down main side output pin.
50
OUT1-2
O
Channel 1 step-down synchronous rectifier side output pin.
47
RB1
--
Channel 1 step-up main side output current setting pin.
49
OUT1-3
O
Channel 1 step-up main side output pin.
48
OUT1-4
O
Channel 1 step-up synchronous rectifier side output pin.
CH 2
38
FB2
O
Channel 2 error amplifier output pin.
39
IN2
I
Channel 2 error amplifier inverted input pin.
40
DTC2
I
Channel 2 dead time control pin.
55
OUT2-1
O
Channel 2 main side output pin.
57
OUT2-2
O
Channel 2 synchronous rectifier side output pin.
CH 3
37
FB3
O
Channel 3 error amplifier output pin.
36
IN3
I
Channel 3 error amplifier inverted input pin.
35
DTC3
I
Channel 3 dead time control pin.
60
OUT3
O
Channel 3 output pin.
CH 4
20
FB4
O
Channel 4 error amplifier output pin.
21
IN4
I
Channel 4 error amplifier inverted input pin.
22
DTC4
I
Channel 4 dead time control pin.
61
OUT4
O
Channel 4 output pin.
CH 5
19
FB5
O
Channel 5 error amplifier output pin.
18
IN5
I
Channel 5 error amplifier inverted input pin.
17
IN(C)5
I
Channel 5 short detection comparator input pin.
16
DTC5
I
Channel 5 dead time control pin.
62
OUT5
O
Channel 5 output pin.
MB3827
4
(Continued)
(Continued)
Pin No.
Symbol
I/O
Descriptions
CH 6
10
IN(A)6
I
Channel 6 inverted amplifier input pin.
11
OUT(A)6
O
Channel 6 inverted amplifier output pin.
13
FB6
O
Channel 6 error amplifier output pin.
12
IN6
I
Channel 6 error amplifier inverted input pin.
14
IN4(C)6
I
Channel 6 short detection comparator input pin.
15
DTC6
I
Channel 6 dead time control pin.
63
OUT6
O
Channel 6 output pin.
5
FB7
O
Channel 7 error amplifier output pin.
6
IN7-1
I
Channel 7 error amplifier 1 inverted input pin.
8
+
IN7
I
Channel 7 error amplifier non-inverted input pin.
7
IN7-2
I
Channel 7 error amplifier 2 inverted input pin.
9
DTC7
I
Channel 7 dead time control pin.
1
OUT7
O
Channel 7 output pin.
2
RB7
--
Channel 7 output current setting pin.
33
RT
--
Triangular wave frequency setting resistor connection pin.
34
CT
--
Triangular wave frequency setting capacitor connection pin.
27
CTL1-4, 7
I
Power supply control circuit pin.(channel 1 to 4 and 7)
"H" level: Power supply active mode
"L" level: Standby mode
28
CTL5
I
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
29
CTL6
I
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
23
IN(C)8
I
Short detection comparator input pin.
31
CSCP
--
Short protection circuit capacitor connection pin.
30
CS1-6
--
Soft start circuit capacitor connection pin (channel 1 to 6).
4
XENB1-6
I
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"
CH 7
(for self power supply)
Triangular-Wave
Oscillator Circuit
Control
Circuit
MB3827
5
(Continued)
Pin No.
Symbol
I/O
Description
26
VCC
--
Reference voltage and control circuit power supply pin.
53
VCC(O)1,2
--
Output circuit power supply pin (Channel 1, 2).
58
VCC(O)3,4
--
Output circuit power supply pin (Channel 3, 4).
64
VCC(O)5,6,7
--
Output circuit power supply pin (Channel 5, 6, 7).
54
VSS(O)1,2
--
Main side output circuit power supply pin (Channel 1, 2).
51
VG(O)1
--
Step-up synchronous rectifier side output circuit power supply pin
(Channel 1).
59
VSS(O)3,4,5,6
--
Output circuit power supply pin (Channel 3, 4, 5, 6).
24
VREF
O
Reference voltage output pin.
32
VB
O
Triangular wave oscillator regulator output pin.
25
GND
--
Ground pin.
46
GND(O)1
--
Output circuit ground pin (Channel 1).
56
GND(O)2,3,4
--
Output circuit ground pin (Channel 2, 3, 4).
3
GND(O)5,6,7
--
Output circuit ground pin (Channel 5, 6, 7).
Power Supply
Circuit
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