FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27231-3E
ASSP For Power Management Applications
(General Purpose DC/DC Converter)
2-ch DC/DC Converter IC
with Overcurrent Protection
MB39A104
s
DESCRIPTION
The MB39A104 is a 2-channel DC/DC converter IC using pulse width modulation (PWM), incorporating an
overcurrent protection circuit (requiring no current sense resistor). This IC is ideal for down conversion.
Operating at high frequency reduces the value of coil.
This is ideal for built-in power supply such as LCD monitors and ADSL.
This product is covered by US Patent Number 6,147,477.
s
FEATURES
•
•
•
•
•
•
•
•
Built-in timer-latch overcurrent protection circuit (requiring no current sense resistor)
Power supply voltage range : 7 V to 19 V
Reference voltage : 5.0 V
±
1
%
Error amplifier threshold voltage : 1.24 V
±
1
%
High-frequency operation capability : 1.5 MHz (Max)
Built-in standby function: 0
µA
(Typ)
Built-in soft-start circuit independent of loads
Built-in totem-pole type output for Pch MOS FET
s
PACKAGE
24-pin plastic SSOP
(FPT-24P-M03)
MB39A104
s
PIN ASSIGNMENTS
(TOP VIEW)
VCCO : 1
VH : 2
OUT1 : 3
VS1 : 4
ILIM1 : 5
DTC1 : 6
VCC : 7
CSCP : 8
FB1 : 9
−INE1
: 10
CS1 : 11
RT : 12
24 : CTL
23 : GNDO
22 : OUT2
21 : VS2
20 : ILIM2
19 : DTC2
18 : GND
17 : VREF
16 : FB2
15 :
−INE2
14 : CS2
13 : CT
(FPT-24P-M03)
2
MB39A104
s
PIN DESCRIPTION
Pin No.
1
2
3
4
5
Symbol
VCCO
VH
OUT1
VS1
ILIM1
I/O
O
O
I
I
Descriptions
Output circuit power supply terminal (Connect to same potential as VCC pin.)
Power supply terminal for FET drive circuit (VH
=
V
CC
−
5 V)
External Pch MOS FET gate drive terminal
Overcurrent protection circuit input terminal
Overcurrent protection circuit detection resistor connection terminal. Set
overcurrent detection reference voltage depending on external resistor and
internal current resource (110
µA
at RT
=
24 kΩ)
PWM comparator block (PWM) input terminal. Compares the lowest voltage
among FB1 and DTC terminals with triangular wave and controls output.
Power supply terminal for reference power supply and control circuit
(Connect to same potential as the VCCO terminal)
Timer-latch short-circuit protection capacitor connection terminal
Error amplifier (Error Amp 1) output terminal
Error amplifier (Error Amp 1) inverted input terminal
Soft-start capacitor connection terminal
Triangular wave oscillation frequency setting resistor connection terminal
Triangular wave oscillation frequency setting capacitor connection terminal
Soft-start capacitor connection terminal
Error amplifier (Error Amp 2) inverted input terminal
Error amplifier (Error Amp 2) output terminal
Reference voltage output terminal
Output circuit ground terminal (Connect to same potential as GNDO
terminal.)
PWM comparator block (PWM) input terminal. Compares the lowest voltage
among FB2 and DTC terminals with triangular wave and controls output.
Overcurrent protection circit detection resistor connection terminal. Set
overcurrent detection reference voltage depending on external resistor and
internal current resource (110
µA
at RT
=
24 kΩ)
Overcurrent protection circuit input terminal
External Pch MOS FET gate drive terminal
Output circuit ground terminal (Connect to same potential as GND terminal.)
Power supply control terminal. Setting the CTL terminal at “L” level places IC
in the standby mode.
6
7
8
9
10
11
12
13
14
15
16
17
18
19
DTC1
VCC
CSCP
FB1
−INE1
CS1
RT
CT
CS2
−INE2
FB2
VREF
GND
DTC2
I
O
I
I
O
O
I
20
21
22
23
24
ILIM2
VS2
OUT2
GNDO
CTL
I
I
O
I
3
MB39A104
s
BLOCK DIAGRAM
−INE1
10
VREF
10
µA
CS1 11
1.24 V
Error
−
Amp1
+
+
L priority
L priority
CH1
Drive1
Pch
1 VCCO
PWM
+
Comp.1
+
−
3 OUT1
FB1 9
I
O
=
200 mA
at VCCO
=
12 V
Current
Protection
Logic
−
+
4 VS1
5 ILIM1
DTC1 6
−INE2
15
L priority
VREF
10
µA
CS2 14
1.24 V
FB2 16
DTC2 19
Error
−
Amp2
+
+
L priority
CH2
Drive2
Pch
I
O
=
200 mA
at VCCO
=
12 V
Current
Protection
Logic
−
+
21 VS2
20 ILIM2
PWM
+
Comp.2
+
−
22 OUT2
H: at SCP
H priority
SCP
Comp.
+
+
−
(3.1 V)
SCP
Logic
CSCP 8
UVLO
H:UVLO
release
bias
OSC
Accuracy
±1%
H: at OCP
V
CC
−
5 V
VH
Bias
Voltage
2 VH
2.5 V
1.5 V
23 GNDO
Error Amp Power Supply
Error Amp Reference
7 VCC
1.24 V
VREF
Power
VR1 ON/OFF
CTL
24 CTL
5.0 V
12 13
RT CT
17
VREF
18
GND
4
MB39A104
s
ABSOLUTE MAXIMUM RATINGS
Parameter
Power supply voltage
Output current
Output peak current
Power dissipation
Storage temperature
Symbol
V
CC
I
O
I
OP
P
D
T
STG
Condition
VCC, VCCO terminal
OUT1, OUT2 terminal
Duty
≤
5% (t
=
1/f
OSC
×Duty)
Ta
≤ +25 °C
Rating
Min
−55
Max
20
60
700
740*
+125
Unit
V
mA
mA
mW
°C
* : The packages are mounted on the epoxy board (10 cm
×
10 cm).
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
s
RECOMMENDED OPERATING CONDITIONS
Parameter
Power supply voltage
Reference voltage output current
VH output current
Input voltage
Control input voltage
Output current
Output Peak current
Oscillation frequency
Timing capacitor
Timing resistor
VH terminal capacitor
Soft-start capacitor
Short-circuit detection capacitor
Reference voltage output
capacitor
Operating ambient temperature
Symbol
V
CC
I
REF
I
VH
V
INE
V
DTC
V
CTL
I
O
I
OP
f
OSC
C
T
R
T
C
VH
C
S
C
SCP
C
REF
Ta
Condition
VCC, VCCO terminal
VREF terminal
VH terminal
−INE1, −INE2
terminal
DTC1, DTC2 terminal
CTL terminal
OUT1, OUT2 terminal
Duty
≤
5% (t
=
1/f
OSC
×Duty)
Value
Min
7
−1
0
0
0
0
−45
−450
100
100
Typ
12
500
500
100
24
0.1
0.1
0.1
0.1
+25
Max
19
0
30
V
CC
−
0.9
V
CC
−
0.9
19
+45
+450
1000
1500
560
130
1.0
1.0
1.0
1.0
+85
Unit
V
mA
mA
V
V
V
mA
mA
kHz
kHz
pF
kΩ
µF
µF
µF
µF
°C
Overcurrent detection
by ON resistance of FET
*
VH terminal
CS1, CS2 terminal
CSCP terminal
VREF terminal
39
11
−30
* : See“
s
SETTING THE TRIANGULAR OSCILLATION FREQUENCY”.
WARNING: The recommended operating conditions are required in order to ensure the normal operation of the
semiconductor device. All of the device’s electrical characteristics are warranted when the device is
operated within these ranges.
Always use semiconductor devices within their recommended operating condition ranges. Operation
outside these ranges may adversely affect reliability and could result in device failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on
the data sheet. Users considering application outside the listed conditions are advised to contact their
FUJITSU representatives beforehand.
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