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8050SD Datasheet

SI-08050SD

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1-1-2 Switching Mode Regulator ICs
SI-8000SD Series Surface Mount, Separate Excitation Step-down Switching Mode Regulator ICs
Features
Lineup
• Surface-mount package (TO263-5)
• Output current: 3.0A
• High efficiency: 79% typ. (SI-8033SD), 84%
typ. (SI-8050SD)
• Requires only 4 discrete external components
• Internally-adjusted phase correction and
output voltage
• Built-in reference oscillator (60kHz)
• Built-in overcurrent and thermal protection
circuits
• Output ON/OFF available
• Soft start available by S.S pin
Applications
Part Number
VO (V)
IO (A)
SI-8033SD
3.3
Absolute Maximum Ratings
Parameter
DC Input Voltage
Symbol
VIN
Ratings
43*1
Power Dissipation*2
PD 3
Junction Temperature
Tj +125
Storage Temperature
Tstg –40 to +125
Thermal Resistance (Junction to Case)
θ j-c
3
Thermal Resistance
(Junction to Ambient Air)
θj-a 33.3
*1: 35V for SI-8033SD
*2: Limited by thermal protection circuit.
• Power supplies for telecommunication equipment
• Onboard local power supplies
Unit
V
W
°C
°C
°C/W
°C/W
SI-8050SD
5.0
3
Conditions
When mounted on glass-epoxy board 40 × 40 mm
(copper area: 100%)
When mounted on glass-epoxy board 40 × 40 mm
(copper area: 100%)
Recommended Operating Conditions
Parameter
DC Input Voltage Range
Output Current Range*
Operating Junction Temperature Range
Operating Temperature Range*
*: Limited by Ta-PD characteristics.
Symbol
VIN1
IO
Tjop
Top
SI-8033SD
5.5 to 28
Ratings
0 to 3.0
–30 to +125
–30 to +125
SI-8050SD
7 to 40
Unit
V
A
°C
°C
Electrical Characteristics
Parameter
Symbol
Output Voltage
Efficiency
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Line Regulation
Load Regulation
Temperature Coefficient of Output Voltage
Overcurrent Protection
Starting Current
Soft
Start Pin*
Low-Level Voltage
Outflow Current at
Low Voltage
VO
Conditions
η
Conditions
f
Conditions
VOLINE
Conditions
VOLOAD
Conditions
VO/Ta
IS1
Conditions
VSSL
ISSL
Conditions
min.
3.17
3.1
20
SI-8033SD
typ.
3.3
VIN=15V, IO=1A
79
VIN=15V, IO=1A
60
VIN=15V, IO=1A
25
VIN=8 to 28V, IO=1A
10
VIN=15V, IO=0.5 to 1.5A
±0.5
VIN=15V
0.2
30
Ratings
max.
3.43
min.
4.8
80
30
3.1
40 20
VSSL=0.2V
SI-8050SD
typ.
5.0
VIN=20V, IO=1A
84
VIN=20V, IO=1A
60
VIN=20V, IO=1A
40
VIN=10 to 30V, IO=1A
10
VIN=20V, IO=0.5 to 1.5A
±0.5
VIN=20V
0.2
30
* 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.
SI-8000SD
5 ON/OFF
VOUT. ON/OFF
SI-8000SD
5 ON/OFF
C3
Soft start
max.
5.2
100
40
40
(Ta=25°C)
Unit
V
%
kHZ
mV
mV
mV/ °C
A
V
µA
SI-8000SD
5 ON/OFF
C3
Soft start
+VOUT. ON/OFF
50 ICs
Sanken electric
Sanken electric



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