DS04-27230-2E
FUJITSU SEMICONDUCTOR
DATA SHEET
ASSP For Power Supply Applications
(DC/DC Converter for DSC/Camcorder)
4-ch DC/DC Converter IC
for low voltage
MB39A103
s
DESCRIPTION
The MB39A103 is a 4-channel DC/DC converter IC using pulse width modulation (PWM). This IC is ideal for up
conversion, down conversion, and up/down conversion.
Achievement of low voltage start-up (1.7 V to) enables operation from low voltage.
4ch is built in TSSOP-30P/package. Each channel can be controlled, and soft-start.
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.
s
FEATURES
Supports for down-conversion and up/down Zeta conversion (CH1)
Supports for up-conversion and up/down Sepic conversion (CH2 to CH4)
Low voltage start-up (CH4): 1.7 V
Power supply voltage range : 2.5 V to 11 V
Reference voltage : 2.0 V
1
%
Error amplifier threshold voltage : 1.24 V
1.5
%
Built-in totem-pole type output for MOS FET
Built-in soft-start circuit independent of loads
High-frequency operation capability: 1.5 MHz (Max)
External short-circuit detection capability by
-
INS terminal
s
PACKAGES
30-pin plastic TSSOP
32-pad plastic BCC
(FPT-30P-M04)
(LCC-32P-M08)
MB39A103
4
s
PIN DESCRIPTION
Block
Pin No.
Symbol
I/O
Descriptions
TSSOP
BCC
CH1
27
25
DTC1
I
Dead time control terminal
28
26
FB1
O
Error amplifier output terminal
29
27
-
INE1
I
Error amplifier inverted input terminal
30
28
CS1
Soft
-
start setting capacitor connection terminal
25
23
OUT1
O
Totem pole type output terminal
CH2
4
1
DTC2
I
Dead time control terminal
3
31
FB2
O
Error amplifier output terminal
2
30
-
INE2
I
Error amplifier inverted input terminal
1
29
CS2
Soft
-
start setting capacitor connection terminal
24
22
OUT2
O
Totem pole type output terminal
CH3
12
10
DTC3
I
Dead time control terminal
13
11
FB3
O
Error amplifier output terminal
14
12
-
INE3
I
Error amplifier inverted input terminal
15
13
CS3
Soft
-
start setting capacitor connection terminal
23
21
OUT3
O
Totem pole type output terminal
CH4
19
17
DTC4
I
Dead time control terminal
18
16
FB4
O
Error amplifier output terminal
17
15
-
INE4
I
Error amplifier inverted input terminal
16
14
CS4
Soft
-
start setting capacitor connection terminal
22
20
OUT4
O
Totem pole type output terminal
OSC
9
6
CT
Triangular wave frequency setting capacitor
connection terminal
8
5
RT
Triangular wave frequency setting resistor
connection terminal
Control
6
3
CTL
I
Power supply control terminal
11
8
CSCP
Short-circuit detection circuit capacitor connection
terminal
20
18
-
INS
I
Short-circuit detection comparator inverted input
terminal
Power
26
24
VCCO
Output block power supply terminal
5
2
VCC
Power supply terminal
7
4
VREF
O
Reference voltage output terminal
21
19
GNDO
Output block ground terminal
10
7
GND
Ground terminal
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