FUJITSU MICROELECTRONICS
DATA SHEET
DS04-27225-4Ea
ASSP For Power Management Applications
6
-ch DC/DC Converter IC with Synchronous
Rectifier for Voltage Step-up and Step-down
MB3883
■
DESCRIPTION
The MB3883 is a 6-channel step-up/step-down DC/DC converter IC using pulse width modulation (PWM) and
synchronous rectification, designed for low voltage, high efficiency, and compact size. This IC is ideal for up
conversion, down conversion, and up/down conversion (using a step-up/step-down Zeta system with free input
and output settings).
The MB3883 can operate at low voltage levels, and has a wide supply voltage range from 1.7 V to 9 V.
The MB3883 is available in two packages, an LQFP-48P or a leadless BCC-48P formed with a contact electrode
pad only.
This is an ideal power supply for high-performance portable devices such as digital still cameras.
This product is covered by US Patent Number 6,147,477.
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FEATURES
• Supports synchronous rectification (CH1, 2, 5)
• Supports for down-conversion and up/down Zeta conversion (CH1, 2)
Supports for up-conversion (CH5)
• Supports up-conversion (CH3, 4, 6)
• Low start-up voltage : 1.7 V (CH6)
(Continued)
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PACKAGES
48-pin plastic LQFP
48-pad plastic BCC
(FPT-48P-M05)
(LCC-48P-M02)
Copyright©2002-2008 FUJITSU MICROELECTRONICS LIMITED All rights reserved
2002.10
MB3883
(Continued)
• Power supply voltage range
•
•
•
•
: 2.4 V to 9 V (CH6)
: 3.6 V to 9 V (CH1 to CH5)
Built-in high-precision reference voltage circuit :
±1 %
Wide operating oscillator frequency range with high-frequency capability : 100 kHz to 1 MHz
Error amplifier output for soft start (CH1 to CH6)
Totem-pole type output switch control circuit
2
MB3883
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PIN ASSIGNMENTS
(TOP VIEW)
Output block
GND (O)
VCC (O)
OUT5-2
OUT5-1
OUT2-2
OUT2-1
OUT1-2
38
RB6
47
46
45
44
43
42
41
40
39
48
37
OUT1-1
OUT6
OUT4
OUT3
SWOUT
SWIN
FB6
(CH5, CH6)
−IN6
C+IN6
DTC5
FB5
−IN5
−IN
(A) 4
OUT (A) 4
FB4
−IN4
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
DTC1
FB1
−IN1
DTC2
FB2
−IN2
DTC3
FB3
−IN3
VB
CT
RT
(CH1
∼
CH3)
13
14
15
16
17
18
19
20
21
22
23
CTL4
−IN
(S) 4
VREF
DTC4
CS
GND
CSCP
VCC
CTL
CTL1, 2
CTL3
(CH4)
Control block
(FPT-48P-M05)
CTL5
24
3
MB3883
(TOP VIEW)
Output block
GND (O)
VCC (O)
OUT5-2
OUT5-1
OUT2-2
OUT2-1
39
48
47
46
45
44
43
42
41
40
SWOUT
SWIN
FB6
−IN6
(CH5, CH6)
C+IN6
DTC5
FB5
−IN5
−IN
(A) 4
OUT (A) 4
FB4
−IN4
−IN
(S) 4
1
2
3
4
5
6
7
8
9
10
11
12
38
OUT1-2
37
36
35
34
33
32
31
30
29
28
27
26
OUT6
OUT4
OUT3
RB6
OUT1-1
DTC1
FB1
−IN1
DTC2
FB2
−IN2
DTC3
FB3
−IN3
VB
CT
RT
14
15
16
17
18
19
20
21
22
23
DTC4
VREF
CSCP
CTL
CTL1, 2
CTL3
CTL4
(CH4)
Control block
(LCC-48P-M02)
4
CTL5
CS
GND
VCC
24
13
25
(CH1
∼
CH3)
MB3883
■
PIN DESCRIPTION
Pin No.
35
34
CH1
36
37
38
32
31
CH2
33
39
40
29
CH3
28
30
41
11
12
14
CH4
43
9
10
13
7
8
CH5
6
45
46
3
4
CH6
5
48
47
Symbol
FB1
−IN1
DTC1
OUT1-1
OUT1-2
FB2
−IN2
DTC2
OUT2-1
OUT2-2
FB3
−IN3
DTC3
OUT3
FB4
−IN4
DTC4
OUT4
−IN
(A) 4
OUT (A) 4
−IN
(S) 4
FB5
−IN5
DTC5
OUT5-1
OUT5-2
FB6
−IN6
C+IN6
RB6
OUT6
I/O
O
I
I
O
O
O
I
I
O
O
O
I
I
O
O
I
I
O
I
O
I
O
I
I
O
O
O
I
I
O
O
Descriptions
Error amplifier output pin.
Error amplifier inverted input pin.
Dead time control pin.
Main side output pin.
Synchronous rectifier side output pin.
Error amplifier output pin.
Error amplifier inverted input pin.
Dead time control pin.
Main side output pin.
Synchronous rectifier side output pin.
Error amplifier output pin.
Error amplifier inverted input pin.
Dead time control pin.
Output pin.
Error amplifier output pin.
Error amplifier inverted input pin.
Dead time control pin.
Output pin.
Inverting amplifier input pin.
Inverting amplifier output pin.
Short detection comparator inverted input pin.
Error amplifier output pin.
Error amplifier inverted input pin.
Dead time control pin.
Main side output pin.
Synchronous rectifier side output pin.
Error amplifier output pin.
Error amplifier inverted input pin.
Soft start capacitor connection pin.
Output current setting resistor connection pin.
Output pin.
(Continued)
5