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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

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SI-8000SD Series
External Dimensions (TO263-5)
9.90±0.2
(15°)
φ1.5 Dp:±0.2
Case temperature
measurement point
3-R0.3
4.5±0.2
1.3
+0.10
–0.05
(3°)
10.0±0.2
(8.0)
(4.4)
(2×R0.45)
0.88±0.10
(1.7±0.25)
0.8±0.1
(1.7±0.25)
12345
(3°) (3°)
2-R0.3
10.0±0.02
(3°)
(R0.3)
0.10±0.15
(3°)
2.4±0.2
(R0.3)
0~6°
(0.5)
(1.7±0.25)
0.8±0.1
(1.7±0.25)
(Unit : mm)
Pin Assignment
q VIN
w SWOUT
e GND
r VOS
t S.S
Plastic Mold Package Type
Flammability: 94V-0
Product Mass: Approx. 1.48g
Block Diagram
1 VIN
Internal power
supply
Oscillator
Overcurrent
protection
SWOUT 2
Reset
Latch & driver
S.S
5
Comparator
Thermal
protection
Error
amplifier
Reference voltage
GND
3
VOS 4
Reference Data
Copper Laminate Area on Glass Epoxy Board vs.
thermal resistance (junction to ambient air) (Typical Value)
55
50
With glass epoxy board of 40 × 40 mm
45
40
35
30
0 200 400 600 800 1000 1200 1400 1600 1800
Copper Laminate Area (mm2)
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Typical Connection Diagram
VIN
C1
1
VIN
2
SWOUT
4
SI-8000SD VOS
+ S.S GND
53
L1
D1
GND
C3
VOUT
+
C2
GND
C1 : 50V/1000µF
C2 : 50V/1000µF
C3 : 0.01µF
(only when soft start function is used)
L1 : 150µH
D1 : SPB-G56 (Sanken)
Diode D1
• Be sure to use Schottky-barrier diode as D1.
If other diodes like fast recovery diodes are used, ICs may be destroyed because of the reverse voltage generated by the recovery voltage or ON
voltage.
Choke coil L1
• If the winding resistance of the choke coil is too high, the efficiency may drop below the rated value.
• As the overcurrent protection starting current is about 3.5 A, take care concerning heat radiation from the choke coil caused by magnetic saturation
due to overload or short-circuited load.
Capacitors C1, C2, and C3
• As large ripple currents flow through C1 and C2, use high-frequency and low-impedance capacitors aiming for switching-mode-power-supply use.
Especially when the impedance of C2 is high, the switching waveform may become abnormal at low temperatures.
For C2, do not use a capacitor with an extremely low equivalent series resistance (ESR) such as an OS capacitor or a tantalum capacitor, which may
cause an abnormal oscillation.
• C3 is a capacitor for soft start. Leave pin 5 open if the soft start function is not used.
This pin is pulled up with a pull-up resistor inside the ICs.
To create the optimum operating conditions, place the components as close as possible to each other.
ICs 51

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qSI-8000SD Series
sSI-8033SD
Power dissipation vs. Output current (typical value)
3.5
VIN 5.5V
8V
3
2.5
2 15V
20V
1.5 28V
1
0.5
0
0 0.5 1 1.5 2 2.5 3 3.5
Output current IO (A)
Output current vs. Input voltage (typical value)
4.0
3.5 With glass epoxy board
measuring 40 × 40 mm
3.0
2.5
2.0
Operable range
1.5
1.0
0.5
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Input voltage VIN [V]
sSI-8050SD
Power dissipation vs. Output current (typical value)
3.5
VIN 7V
10V
3
2.5
20V
2
30V, 40V
1.5
1
0.5
0
0 0.5 1 1.5 2 2.5 3 3.5
Output current IO (A)
Output current vs. Input voltage (typical value)
4.0
3.5 With glass epoxy board
measuring 40 × 40 mm
3.0
2.5
2.0
Operable range
1.5
1.0
0.5
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Input voltage VIN [V]
www.sDaPtaDS-hTeaet4CUh.caormacteristics
3.5
Copper laminate aera:
40×40 mm
(θj-a : 33.3°C/W)
3 20×40 mm
(θj-a : 37°C/W)
2.5 20×20 mm
(θj-a : 44°C/W)
10×10 mm
2 (θj-a : 53°C/W)
1.5
1
0.5
0
25 0 25 50 75 100 125
Ambient temperature Ta (°C)
When mounted on glass epoxy board
measuring 40 × 40 mm
100 VO
PD=VO IO
1 VF IO 1
ηχ VIN
Find the efficiency from the efficiency curve and substi-
tute in the percentage, because the efficiency varies de-
pending on the input voltage and output current.
VO : Output voltage
VIN: Input voltage
IO : Output current
ηχ : Efficiency
VF : Forward voltage of D1
0.4V (IO=2A) ··· SPB-G56S (Sanken)
Thermal design for D1 must be performed separately.
Applications
Varying output voltage
The output voltage can be varied in the same manner as SI-8000S. Refer of the catalog.