16 ICs
1-1-3 DC/DC Converter ICs
■Lineup
■Absolute Maximum Ratings
Unit
V
A
W
°C
°C
°C/W
°C/W
Ratings
43
1.5
3
+125
–40 to +125
3
33.3
Symbol
VIN
IO
PD
Tj
Tstg
θ
j-c
θ
j-a
Parameter
DC Input Voltage
Output Current
Power Dissipation*
Junction Temperature
Storage Temperature
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to
Ambient Air)
Part Number SI-8033JD SI-8050JD SI-8090JD SI-8120JD
VO(V) 3.3 5.0 9.0 12.0
IO(A) 1.5
■Recommended Operating Conditions
Parameter
DC Input Voltage Range
DC Output Current Range*
Operating Junction Temperature Range
Operating Temperature Range*
Symbol
VIN1
VIN2
IO
Tjop
Top
Conditions
IO=0 to 1A
IO=0 to 1.5A
VIN≥VO+3V
Ratings
SI-8033JD SI-8050JD SI-8090JD SI-8120JD
5.3 to 40 7 to 40 11 to 40 14 to 40
6.3 to 40 8 to 40 12 to 40 15 to 40
0 to 1.5
–30 to +125
–30 to +125
■Features
•Surface-mount package (TO263-5)
•Output current: 1.5A
•High efficiency: 77 to 88%
•Requires only 4 discrete components
•Internally-adjusted phase correction and
output voltage
•Capable of downsizing a choke-coil due to IC's
high switching frequency (125 kHz). (Com-
pared with conventional Sanken devices)
•Built-in foldback-overcurrent and thermal
protection circuits
•Output ON/OFF available (Circuit current at
output OFF: 200
µ
A max)
•Soft start available by ON/OFF pin Conditions
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%)
*: Limited by thermal protection circuit
Unit
V
A
°C
°C
*: Limited by Ta–PD characteristics
*: Pin 5 is the ON/OFF 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.
ON/OFF-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.
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
■Electrical Characteristics
Unit
V
%
kHZ
mV
mV
mV/°C
A
V
µ
A
mA
µ
A
Parameter
Output Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Temperature Coefficient of Output Voltage
Overcurrent Protection
Starting Current
ON/OFF
*
Low Level Voltage
Pin
Outflow Current
at Low Voltage
Quiescent Circuit Current
Symbol
VO
Conditions
η
Conditions
f
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
∆VO/∆Ta
IS1
Conditions
VSSL
ISSL
Conditions
Iq
Conditions
Iq(oFF)
Conditions
(Ta=25°C)
Surface-Mount, Separate Excitation Step-down Switching Mode
SI-8000JD Series
■Applications
•Power supplies for telecommunication equipment
•Onboard local power supplies, etc.
Ratings
SI-8033JD SI-8050JD SI-8090JD SI-8120JD
min. typ. max. 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 11.76 12.00 12.24
VIN=15V, IO=0.5A VIN=20V, IO=0.5A VIN=21V, IO=0.5A VIN=24V, IO=0.5A
77 82 86 88
VIN=15V, IO=0.5A VIN=20V, IO=0.5A VIN=21V, IO=0.5A VIN=24V, IO=0.5A
125 125 125 125
VIN=15V, IO=0.5A VIN=20V, IO=0.5A VIN=21V, IO=0.5A VIN=24V, IO=0.5A
25 80 40 100 50 120 60 130
VIN=8 to 30V, IO=0.5A VIN=10 to 30V, IO=0.5A VIN=15 to 30V, IO=0.5A VIN=18 to 30V, IO=0.5A
10 30 10 40 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 VIN=24V, IO=0.2 to 0.8A
±0.5 ±0.5 ±1.0 ±1.0
1.6 1.6 1.6 1.6
VIN=15V VIN=20V VIN=21V VIN=24V
0.5 0.5 0.5 0.5
100 100 100 100
VSSL=0V
7777
VIN=15V, Io=0A VIN=20V, Io=0A VIN=21V, Io=0A VIN=24V, Io=0A
200 200 200 200
VIN=15V, VON/OFF=0.3V VIN=20V, VON/OFF=0.3V VIN=21V, VON/OFF=0.3V VIN=24V, VON/OFF=0.3V
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17
ICs
SI-8000JD Series
■External Dimensions (T O263-5) (Unit : mm)
Pin Assignment
qVIN
wSWOUT
eGND
rVOS
tON/OFF
Plastic Mold Package Type
Flammability: 94V-0
Product Mass: Approx. 1.48g
15.30
±0.3
(6.8)
9.2
±0.2
4.9
±0.2
(1.75)
(2×R0.45)
(1.7
±0.25
)(1.7
±0.25
)0.8
±0.1
10.0
±0.2
(4.4)
(8.0)
(0.40)
2.54
±0.3
(4.6)
9.2±
±0.2
1.2
±0.2
4.9
±0.2
(0.75) 2.0
±0.1
15.3
±0.3
9.9
±0.2
Case temperature
measurement point
(15°)
(0.5)
2-R0.3
10.0
±0.02
3-R0.3
(R0.3)
(R0.3)
0.88
±0.10
1.5 Dp:
±0.2
φ
(1.7
±0.25
)
12345
(1.7
±0.25
)
0.8
±0.1
4.5
±0.2
1.3
0.10
±0.15
2.4
±0.2
+0.10
–0.05
(3°)(3°)
(3°)
(3°)(3°)
0 to 6°
■Block Diagram ■Typical Connection Diagram
4
3
GND
2
VIN
ON/OFF
SWOUT
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
V
IN
GNDON/OFF
GND
SI-8000JD
SW
OUT
V
OS
12
4
35
+ +
V
OUT
GND
C1:50V/220
µ
F
C2:25V/470
µ
F
C3:10V/0.47
µ
F (Only when using soft-start function)
L1:100
µ
H
Di :SJPB-H6 (Sanken)
■Reference Data
Copper Laminate Area on Glass Epoxy Board vs.
Thermal Resistance (Junction to Ambient Air) (Typical Value)
Output Current vs. Power Dissipation (Typical)
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 Laminate Area (mm
2
)
Output Current I
O
(A)
V
IN
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 of 40 × 40 mm
θ
■Ta-PD Characteristics
The efficiency depends on the input voltage and the output current. Therefore, obtain the value
from the efficiency graph and substitute the percentage in the formula above.
VO:Output Voltage
VIN :Input Voltage
IO:Output Current
ηχ
:Efficiency (%)
VF:D1 forward voltage
0.4V(IO=2A)(SJPB-H6)
Thermal design for D1 must be considered separately.
3.5
3
2.5
2
1.5
1
0.5
0
–25 0 25 50 75 100 125
Power Dissipation P
D
(W)
Ambient Temperature T
a
(°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
PD=VO·IO 100 –1 –VF·IO 1– VO
ηχ
VIN
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