1-1-3 DC/DC Converter ICs
SI-8000S Series Full-Mold, Separate Excitation Step-down Switching Mode
■Features
■Lineup
• Compact full-mold package (equivalent to
TO220)
Part Number
SI-8033S
SI-8050S
SI-8090S
SI-8120S
SI-8150S
VO(V)
3.3
5.0
9.0
12.0
15.0
IO(A)
• Output current: 3.0A
• High efficiency: 79 to 91%
3.0
■Absolute Maximum Ratings
• Requires only 4 discrete components
Parameter
Symbol
Ratings
VIN
43*
V
PD1
18(With infinite heatsink)
W
PD2
1.5(Without heatsink, stand-alone operation)
W
Tj
+125
°C
Storage Temperature
Tstg
–40 to +125
°C
SW Terminal Applied Reverse Voltage
VSW
–1
V
Thermal Resistance(junction to case)
θ j-c
5.5
°C/W
• Internally-adjusted phase correction and output
voltage
DC Input Voltage
• Built-in reference oscillator (60kHz)
Power Dissipation
• Built-in overcurrent and thermal protection
circuits
Junction Temperature
• Built-in soft start circuit (Output ON/OFF
available)
Unit
*35V for SI-8033S
■Applications
• Power supplies for telecommunication equipment
• Onboard local power supplies
■Recommended Operating Conditions
Ratings
Parameter
Symbol
SI-8033S
SI-8050S
SI-8090S
SI-8120S
5.5 to 28
7 to 40
12 to 40
15 to 40
Unit
SI-8150S
18 to 40
DC Input Voltage Range
VIN
Output Current Range
IO
0 to 3.0
A
Tjop
–30 to +125
°C
Operating Junction Temperature Range
V
■Electrical Characteristics
(Ta=25°C)
Ratings
Parameter
Symbol
SI-8033S
min.
3.17
SI-8000S*1
Output Voltage
SI-8000SS
VO
typ.
3.234
Conditions
Line Regulation
Load Regulation
Temperature Coefficient of
Output Voltage
Overcurrent Protection
Starting Current
Pin*2
min.
typ.
max.
min.
typ.
max.
3.30
3.43
4.80
5.00
5.20
8.55
9.00
9.45
11.50
12.00
12.50
14.25
15.00
15.75
3.30
3.366
4.90
5.00
5.10
VIN=21V, IO=1.0A
VIN=25V, IO=1.0A
84
88
90
91
VIN=21V, IO=1.0A
VIN=24V, IO=1.0A
VIN=25V, IO=1.0A
60
60
60
60
VIN=20V, IO=1.0A
VIN=21V, IO=1.0A
VIN=24V, IO=1.0A
%
VIN=25V, IO=1.0A
80
40
100
50
120
60
130
60
kHZ
130
VIN=10 to 30V, IO=1.0A
VIN=15 to 30V, IO=1.0A
VIN=18 to 30V, IO=1.0A
10
10
10
10
mV
VIN=21 to 30V, IO=1.0A
10
30
VIN=15V, IO=0.5 to 1.5A
40
VIN=20V, IO=0.5 to 1.5A
±0.5
40
VIN=21V, IO=0.5 to 1.5A
±0.5
3.1
VIN=24V, IO=0.5 to 1.5A
±1.0
3.1
40
15
mV
VIN=25V, IO=0.5 to 1.5A
±1.0
3.1
40
mV/°C
±1.0
3.1
3.1
VIN=15V
VSSL
ICs
VIN=24V, IO=1.0A
VIN=20V, IO=1.0A
VIN=20V
VIN=21V
VIN=24V
0.2
25
0.2
25
0.2
25
0.2
25
A
VIN=25V
0.2
25
35
15
35
Conditions
*1:“S” may be printed to the right of the marking (except SI-8090S, SI-8120S, SI-8150S).
*2:Pin 5 is a soft start pin. Soft start at power on can be performed with a capacitor connected to
this pin.
The output can also be turned ON/OFF with this pin.
The output is stopped by setting the voltage of this pin to VSSL or lower.
Soft-start pin voltage can be changed with an open-collector drive circuit of a transistor.
When using both the soft-start and ON/OFF functions together, the discharge current from C3
flows into the ON/OFF control transistor. Therefore, limit the current securely to protect the
transistor if C3 capacitance is large.
The ON/OFF pin is pulled up to the power supply in the IC, so applying the external voltage is
prohibited.
If this pin is not used, leave it open.
46
V
VIN=20V, IO=1.0A
VIN=8 to 28V, IO=1.0A
Conditions
ISSL
max.
25
∆VO/∆Ta
Outflow Current at
Low Voltage
typ.
60
∆VOLOAD
IS1
Unit
min.
VIN=15V, IO=1.0A
∆VOLINE
Low-Level Voltage
Soft
Start
f
Conditions
SI-8150S
max.
79
Conditions
Conditions
SI-8120S
typ.
VIN=15V, IO=1.0A
Conditions
Oscillation Frequency
SI-8090S
min.
VIN=15V, IO=1.0A
η
Efficiency
SI-8050S
max.
15
35
15
35
15
V
35
VSSL=0.2V
µA
SI-8000S
SI-8000S
SI-8000S
5 ON/OFF
5 ON/OFF
5 ON/OFF
C3
VOUT. ON/OFF
Soft start
C3
Soft start
+VOUT. ON/OFF
