Parameter
DC Input Voltage
Output Current
Power Dissipation*
Junction Temperature
Storage Temperature
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to Ambient Air)
Symbol
VIN
IO
PD
Tj
Tstg
Rth(j-c)
Rth(j-a)
SI-8000JD Series
Surface-Mount, Separate Excitation Switching Type
●SI-8000JD Series
Conditions
IO=0 to 1A
IO=0 to 1.5A
VIN≥VO+3V
Symbol
VIN1
VIN2
IO
Tjop
Top
■Absolute Maximum Ratings
■Recommended Operating Conditions
Unit
V
A
W
°C
°C
°C/W
°C/W
Part Namber SI-8033JD SI-8050JD SI-8090JD
VO(V) 3.3 5.0 9.0
IO(A) 1.5
Ratings
43
1.5
3
+125
–40 to +125
3
33.3
Ratings
SI-8033JD SI-8050JD SI-8090JD
5.3 to 6.3 7 to 8 11 to 12
6.3 to 40 8 to 40 12 to 40
0 to 1.5
–30 to +125
–30 to +125
Conditions
Glass-epoxy board mounting 40 × 40 mm (copper area 100%)
Glass-epoxy board mounting 40 × 40 mm (copper area 100%)
Unit
V
A
°C
°C
Parameter
DC Input Voltage Range
DC Output Current Range*
Operating Junction Temperature Range
Operating Temperature Range*
*: Limited by Ta–PD characteristics
*: Limited by thermal protection circuit
■Features
• Surface-mount package (TO263-5)
• Output current: 1.5 A
• High efficiency: 77 to 86%
• Requires only 4 external components
• Phase correction and output voltage adjustment performed internally
• Choke coil size can be reduced through the employment of high frequency
(125 kHz) design
• Built-in foldback overcurrent protection, thermal protection circuit
• Output ON/OFF possible (OFF state current consumption: 200
µ
A max)
• Soft start possible via ON/OFF pin
■Applications
• Power supplies for telecommunication equipment
• Onboard local power supplies, etc.
■Lineup
●SI-8000JD Series
■External Dimensions (Unit : mm)
Pin Arrangement
qVIN
wSWOUT
eGND
rVOS
tON/OFF
Plastic Mold Package Type
Flammability: 94V-0
Weight: Approx. 1.48g
Parameter
Output V oltage
Efficiency
Switching Frequency
Line Regulation
Load Regulation
Temperature Coefficient of Output Voltage
Overcurrent Protection
Starting Current
ON/OFF
*
Low Level Voltage
Pin Low-State
Output Current
Quiescent Circuit Current
■Electrical Characteristics (Ta=25°C)
Unit
V
%
kHZ
mV
mV
mV/°C
A
V
µ
A
mA
µ
A
Symbol
VO
Conditions
η
Conditions
f
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
∆VO/∆Ta
IS1
Conditions
VSSL
ISSL
Conditions
Iq
Conditions
Iq(oFF)
Conditions
*: Pin 5 is the ON/OFF pin. Connecting a capacitor to this pin enables a soft
start at pow er-on. By using this pin, the output can also be turned on or off.
By setting the voltage of this pin to VSSL or lower, the output is stopped.
Driving a transistor with an open collector can perf orm switching of the po-
tential of the ON/OFF pin.
When using both the soft-start and ON/OFF functions together, the
discharge current from C3 flows to the ON/OFF control transistor, so
ensure that this current is limited for protection. The ON/OFF pin is pulled
up to the power supply in the IC, so no external voltage can be applied. If
this pin is not used, leave it open.
SI-8000JD SI-8000JD
ON/OFF5 ON/OFF5 ON/OFF
C3C3
5
V
OUT.
ON/OFF Soft Start Soft Start
+V
OUT.
ON/OFF
SI-8000JD
(0.40)
15.30
±0.3
(6.8)
9.2
±0.2
4.9
±0.2
2.54
±0.3
(4.6)
9.2±
±0.2
1.2
±0.2
4.9
±0.2
(0.75) 2.0
±0.1
(1.75)
15.3
±0.3
9.90
±0.2
Case Temperature Measurement Point
(15°)
(0.5)
2-R0.3
10.0
±0.02
3-R0.3
(2×R0.45)
(R0.3)
(R0.3)
0.88
±0.10
1.5 Dp:
±0.2
φ
(1.7
±0.25
)
12345
(1.7
±0.25
)(1.7
±0.25
)(1.7
±0.25
)
0.8
±0.1
0.8
±0.1
4.5
±0.2
1.3
0.10
±0.15
2.4
±0.2
+0.10
–0.05
10.0
±0.2
(4.4)
(8.0)
(3°)(3°)
(3°)
(3°)(3°)
0~6°
Ratings
SI-8033JD SI-8050JD SI-8090JD
min. typ. max. min. typ. max. min. typ. max.
3.234 3.30 3.366 4.90 5.00 5.10 8.82 9.00 9.18
VIN=15V, IO=0.5A VIN=20V, IO=0.5A VIN=21V, IO=0.5A
77 82 86
VIN=15V, IO=0.5A VIN=20V, IO=0.5A VIN=21V, IO=0.5A
125 125 125
VIN=15V, IO=0.5A VIN=20V, IO=0.5A VIN=21V, IO=0.5A
25 80 40 100 50 120
VIN=8 to 30V, IO=0.5A VIN=10 to 30V, IO=0.5A VIN=15 to 30V, IO=0.5A
10 30 10 40 10 40
VIN=15V, IO=0.2 to 0.8A VIN=20V, IO=0.2 to 0.8A VIN=21V, IO=0.2 to 0.8A
±0.5 ±0.5 ±1.0
1.6 1.6 1.6
VIN=15V VIN=20V VIN=21V
0.5 0.5 0.5
100 100 100
VSSL=0V
777
VIN=15V, Io=0A VIN=20V, Io=0A VIN=21V, Io=0A
200 200 200
VIN=15V, VON/OFF=0.3V VIN=20V, VON/OFF=0.3V VIN=21V, VON/OFF=0.3V
■Example of Pattern on PC Board
* For the optimum operating conditions, use one-point GND wiring centering on pin 3, and place each component as closely as
possible.
●SI-8000JD Series
■Block Diagram ■Standard External Circuit
Area of Copper on Glass Epoxy Board vs.
Thermal Resistance (Junction to Ambient Air) (Typical Value)
4
3
GND
2
VIN
ON/OFF
SW OUT
1
5PReg. OCP
Reset
OSC
+
–Comp.
Error Amp.
Latch &
Drive
TSD
ON/OFF
Soft
Start
VREF
+
–
V
IN
C
1
C
3
Di
L1
C
2
VIN
GNDON/OFF
GND
SI-8000JD
SW
VS
12
4
35
+ +
VOUT
GND
C1:50V/220
µ
F
C2:25V/470
µ
F
C3:10V/0.47
µ
F (when using soft-start function)
L1:100
µ
H
Di :SFPB-66 (Sanken)
C1
C2
C3
SI-8000JD
GNDGND
S
Vins
Vos Vout
Di
Di
Vin SW
SI-8000JD
6.8±0.1
9±0.23.7±0.054±0.1
11±0.2
9±0.1
1.7±0.1 1±0.05
Unit : mm
55
50
45
40
35
30
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0 200
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
400 600 800 1000
Copper area (mm2)
Output Current I
O
(A)
VIN 8V 20V 30V 40V
Thermal Resistance (junction to ambient air)
j-a (°C/W )
Power Dissipation
Pd (W)
1200 1400 1600 1800
With glass epoxy board measuring 40 × 40 mm
θ
Recommended Pattern Recommended Land Pattern
Output Current vs. Power Dissipation (Typical)
■Ta-PD Characteristics
The efficiency depends on the input voltage and the
output current. Therefore, obtain the value from the
efficiency characteristic curve and substitute the per-
centage in the formula above.
VO: Output V oltage
VIN: Input V oltage
IO: Output Current
ηχ
: Efficiency (%)
VF:D1 forward voltage
0.4V(IO=2A)(SFPB-66)
Thermal design for D1 must be done separately.
3.5
3
2.5
2
1.5
1
0.5
0
–25 0 25 50 75 100 125
Power Dissipation PD (W)
Ambient Temperature Ta (°C)
Copper Area
40×40 mm
( j-a : 33.3°C/W)
20×40 mm
( j-a : 37°C/W)
20×20 mm
( j-a :44°C/W)
10×10 mm
( j-a : 53°C/W)
θ
θ
θ
θ
●SI-8000JD Series
PD=VO • IO 100 –1 –VF • IO 1– VO
ηχ
VIN
■Selecting External Components
1. Inductor L1
qIt must be suitable for a switching regulator.
Do not use inductors such as for noise filters, because they generate excessive heat.
wThe rated current must be satisfied.
If the rated current is exceeded, magnetic saturation leads to overcurrent.
2. Capacitor C1, C2
qThe breakdown voltage and allowable ripple current must be satisfied.
Exceeding the ratings of these capacitors or using them without derating shortens their service lives and may also cause abnormal
oscillation of the IC.
wUse a low-impedance type capacitor for C2.
C2 must be a low-impedance type capacitor to ensure reduced ripple voltage and a stable switching operation.
eDo not use a capacitor that has an extremely small ESR (equivalent series resistance) such as an OS capacitor or tantalum capacitor.
rC3 is a capacitor for soft start. When not using soft start, leave pin 5 open. It is pulled up inside the IC.
3. Diode D1
The Sank en SFPB-66 diode is recommended for D1. If you intended to use an equivalent diode, be sure to use a Schottkey Barrier diode.
If you use a fast recovery diode or any other diode, supplying a reverse voltage generated from the recovery or ON voltage of the diode
may damage the IC.
Application
Variable output voltage
Output voltage can be adjusted in the same wa y as SI-8000S.
Efficiency Characteristics
(SI-8033JD)(SI-8050JD) (SI-8090JD)
Output V oltage Characteristics
(SI-8033JD)(SI-8050JD) (SI-8090JD)
Load Regulation (SI-8033JD)(SI-8050JD) (SI-8090JD)
■Typical Characteristics
90
80
70
60
50
40
30
200 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Output Current I
O
(A)
(T
a
=25°C)
V
IN
=6.3V
15V
30V
40V
Efficiency (%)
η
5
4
3
2
1
002 6 10 14 184812
Input Voltage VIN (V)
Output Voltage VO (V)
16 20
(Load=C.R T
a
=25°C)
1.5A
I
O
=0A
0.5A
3.40
3.38
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
15V
30V
6.3V
Output Voltage V
O
(V)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Output Current I
O
(A)
(T
a
=25°C)
V
IN
=40V
90
80
70
60
50
40
300 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Output Current I
O
(A)
(T
a
=25°C)
V
IN
=8V
20V
40V
30V
Efficiency (%)
η
6
5
4
3
2
1
002 6 10 14 184812
Input Voltage VIN (V)
0.5A
Output Voltage VO (V)
16 20
(Load=C.R T
a
=25°C)
I
O
=0A
1.5A
5.10
5.08
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
4.90
20V
8V
Output Voltage V
O
(V)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Output Current I
O
(A)
(T
a
=25°C)
V
IN
=40V 30V
100
90
80
70
60
50
40
Efficiency (%)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Output Current I
O
(A)
(T
a
=25°C)
V
IN
=12V
40V
21V30V
η
12
10
8
6
4
2
002 6 10 14 184812
Input Voltage VIN (V)
Output Voltage VO (V)
16 20
(T
a
=25°C)
1.5A
I
O
=0A
0.5A
9.20
9.15
9.10
9.05
9.00
8.95
8.90
8.85
8.80
21V
12V
Output Voltage V
O
(V)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Output Current I
O
(A)
(T
a
=25°C)
V
IN
=40V 30V
●SI-8000JD Series
Overcurrent Protection Characteristics
(SI-8033JD)(SI-8050JD) (SI-8090JD)
Thermal Protection Characteristics
(SI-8033JD)(SI-8050JD) (SI-8090JD)
Temperature Characteristics
(SI-8033JD)(SI-8050JD) (SI-8090JD)
Output Voltage V
O
(V)
5
4
3
2
1
00 0.5 1.0
Output Current I
O
(A)
1.5 2.0 2.5 3.0
(Ta=25°C)
VIN=8V
15V
30V
40V
50 75 100 125 150 175 200
5
4
3
2
1
0
Ambient Temperature Ta (°C)
Output Voltage VO (V)
VIN=15V, IO=0A
TSD OFF TSD ON
150
140
130
120
110
100
90
80
70
60
Output Voltage V
O
(V)
–40 –20 0 20 40 60 80 100 120 140
Ambient Temperature Ta (°C)
Freq
3.38
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
η
V
O
V
IN
=15V, I
O
=0.5A
Efficiency (%) Operating Frequency (kHz)
η
Output Voltage V
O
(V)
6
5
4
3
2
1
00 0.5 1.0
Output Current I
O
(A)
1.5 2.0 2.5 3.0
(Ta=25°C)
VIN=10V
20V
30V
40V
150
140
130
120
110
100
90
80
70
60
Output Voltage V
O
(V)
–40 –20 0 20 40 60 80 100 120 140
Ambient Temperature T
a
(°C)
Freq
5.08
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
4.90
V
O
V
IN
=20V, I
O
=0.5A
η
Efficiency (%) Operating Frequency (kHz)
η
Output Voltage VO (V)
12
10
8
6
4
2
00 0.5 1.0
Output Current IO (A)
1.5 2.0 2.5 3.0
(T
a
=25°C)
V
IN
=40V
30V
21V
14V
150
140
130
120
110
100
90
80
70
60
Output Voltage V
O
(V)
–40 –20 0 20 40 60 80 100 120 140
Ambient Temperature Ta (°C)
Freq
9.10
9.08
9.06
9.04
9.02
9.00
8.98
8.96
8.94
8.92
VO
VIN=21V, IO=0.5A
η
Efficiency (%) Operating Frequency (kHz)
η
50 75 100 125 150 175 200
10
8
6
4
2
0
Ambient Temperature T
a
(°C)
Output Voltage V
O
(V)
V
IN
=20V, I
O
=0A
TSD OFF TSD ON
50 75 100 125 150 175 200
10
8
6
4
2
0
Ambient Temperature T
a
(°C)
Output Voltage V
O
(V)
V
IN
=21V, I
O
=0A
TSD OFF TSD ON
●SI-8000JD Series
[Note on Thermal Protection]
The thermal protection circuit is intended for protection against
heat during instantaneous short-circuiting. Its operation is not
guaranteed f or continuous heating conditions such as short-cir-
cuiting over extended periods of time.
