Document
1-1-3 DC/DC Converter ICs
SI-8000S Series Full-Mold, Separate Excitation Step-down Switching Mode
■Features
• Compact full-mold package (equivalent to TO220)
• Output current: 3.0A • High efficiency: 79 to 91% • Requires only 4 discrete components
• Internally-adjusted phase correction and output voltage
• Built-in reference oscillator (60kHz) • Built-in overcurrent and thermal protection
circuits • Built-in soft start circuit (Output ON/OFF
available)
■Lineup
Part Number VO(V) IO(A)
SI-8033S 3.3
SI-8050S 5.0
SI-8090S 9.0 3.0
SI-8120S 12.0
■Absolute Maximum Ratings
Parameter DC Input Voltage
Power Dissipation
Junction Temperature Storage Temperature SW Terminal Applied Reverse Voltage Thermal Resistance(junction to case)
Symbol VIN PD1 PD2 Tj Tstg VSW θ j-c
*35V for SI-8033S
Ratings 43*
18(With infinite heatsink) 1.5(Without heatsink, stand-alone operation)
+125 –40 to +125
–1 5.5
■Applications
• Power supplies for telecommunication equipment
• Onboard local power supplies
■Recommended Operating Conditions
Parameter
DC Input Voltage Range Output Current Range Operating Junction Temperature Range
Symbol
VIN IO Tjop
SI-8033S 5.5 to 28
SI-8050S 7 to 40
Ratings SI-8090S 12 to 40 0 to 3.0 –30 to +125
SI-8120S 15 to 40
SI-8150S 18 to 40
SI-8150S 15.0
Unit V W W °C °C V
°C/W
Unit V A °C
■Electrical Characteristics
Parameter
Output Voltage
SI-8000S*1 SI-8000SS
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation Temperature Coefficient of Output Voltage
Symbol
VO
Conditions η
Conditions f
Conditions ∆VOLINE Conditions ∆VOLOAD Conditions
SI-8033S min. typ. max. 3.17 3.30 3.43 3.234 3.30 3.366
VIN=15V, IO=1.0A 79
VIN=15V, IO=1.0A 60
VIN=15V, IO=1.0A 25 80
VIN=8 to 28V, IO=1.0A 10 30
VIN=15V, IO=0.5 to 1.5A
∆VO/∆Ta
±0.5
SI-8050S min. typ. max. 4.80 5.00 5.20 4.90 5.00 5.10
VIN=20V, IO=1.0A 84
VIN=20V, IO=1.0A 60
VIN=20V, IO=1.0A 40 100
VIN=10 to 30V, IO=1.0A 10 40
VIN=20V, IO=0.5 to 1.5A
±0.5
Ratings SI-8090S min. typ. max. 8.55 9.00 9.45
VIN=21V, IO=1.0A 88
VIN=21V, IO=1.0A 60
VIN=21V, IO=1.0A 50 120
VIN=15 to 30V, IO=1.0A 10 40
VIN=21V, IO=0.5 to 1.5A
±1.0
SI-8120S min. typ. max. 11.50 12.00 12.50
VIN=24V, IO=1.0A 90
VIN=24V, IO=1.0A 60
VIN=24V, IO=1.0A 60 130
VIN=18 to 30V, IO=1.0A 10 40
VIN=24V, IO=0.5 to 1.5A
±1.0
SI-8150S min. typ. max. 14.25 15.00 15.75
VIN=25V, IO=1.0A 91
VIN=25V, IO=1.0A 60
VIN=25V, IO=1.0A 60 130
VIN=21 to 30V, IO=1.0A 10 40
VIN=25V, IO=0.5 to 1.5A
±1.0
(Ta=25°C) Unit
V
% kHZ mV mV mV/ °C
Overcurrent Protection Starting Current
Soft Low-Level Voltage
Start Pin*2
Outflow Current at Low Voltage
IS1 Conditions VSSL
ISSL Conditions
3.1 VIN=15V
3.1 VIN=20V
3.1 VIN=21V
VSSL=0.2V
3.1 VIN=24V
3.1 VIN=25V
A V µA
*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 .