1-1-2 Switching Mode Regulator ICs
SI-8000JD Series
sFeatures
• 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
Surface-Mount, Separate Excitation Step-down Switching Mode Regulator ICs
sLineup
Part Number
V
O
(V)
I
O
(A)
SI-8033JD
3.3
SI-8050JD
5.0
1.5
SI-8090JD
9.0
SI-8120JD
12.0
sAbsolute
Maximum Ratings
Parameter
DC Input Voltage
Output Current
Power Dissipation
*
Junction Temperature
Storage Temperature
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to
Ambient Air)
Symbol
V
IN
I
O
P
D
T
j
T
stg
Ratings
43
1.5
3
+125
–40 to +125
3
33.3
Unit
V
A
W
°C
°C
°C/W
°C/W
When mounted on glass-epoxy board 40
×
40 mm (copper
area 100%)
When mounted on glass-epoxy board 40
×
40 mm (copper
area 100%)
Conditions
• 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
θ
j-c
θ
j-a
*: Limited by thermal protection circuit
sApplications
• Power supplies for telecommunication equipment
• Onboard local power supplies, etc.
sRecommended
Operating Conditions
Ratings
Parameter
DC Input Voltage Range
DC Output Current Range
*
Operating Junction Temperature Range
Operating Temperature Range*
Symbol
V
IN1
V
IN2
I
O
T
jop
T
op
SI-8033JD
5.3 to 40
6.3 to 40
SI-8050JD
7 to 40
8 to 40
0 to 1.5
–30 to +125
–30 to +125
SI-8090JD
11 to 40
12 to 40
SI-8120JD
14 to 40
15 to 40
V
A
°C
°C
Unit
Conditions
I
O
=0 to 1A
I
O
=0 to 1.5A
V
IN
≥V
O
+3V
*: Limited by Ta–P
D
characteristics
sElectrical
Characteristics
Ratings
Parameter
Symbol
min.
V
O
Output Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Temperature Coefficient of Output Voltage
Overcurrent Protection
Starting Current
Low Level Voltage
ON/OFF
*
Pin
Outflow Current
at Low Voltage
Conditions
3.234
SI-8033JD
typ.
3.30
77
V
IN
=15V, I
O
=0.5A
125
V
IN
=15V, I
O
=0.5A
25
10
±0.5
1.6
V
IN
=15V
0.5
100
7
V
IN
=15V, Io=0A
200
V
IN
=15V, V
ON/OFF
=0.3V
7
V
IN
=20V, Io=0A
200
V
IN
=20V, V
ON/OFF
=0.3V
1.6
V
IN
=20V
0.5
100
V
SSL
=0V
7
V
IN
=21V, Io=0A
200
V
IN
=21V, V
ON/OFF
=0.3V
7
V
IN
=24V, Io=0A
200
V
IN
=24V, V
ON/OFF
=0.3V
80
30
V
IN
=8 to 30V, I
O
=0.5A
V
IN
=15V, I
O
=0.2 to 0.8A
max.
3.366
min.
4.90
SI-8050JD
typ.
5.00
82
V
IN
=20V, I
O
=0.5A
125
V
IN
=20V, I
O
=0.5A
40
10
±0.5
1.6
V
IN
=21V
0.5
100
100
40
V
IN
=10 to 30V, I
O
=0.5A
V
IN
=20V, I
O
=0.2 to 0.8A
max.
5.10
min.
8.82
SI-8090JD
typ.
9.00
86
V
IN
=21V, I
O
=0.5A
125
V
IN
=21V, I
O
=0.5A
50
10
±1.0
1.6
V
IN
=24V
0.5
100
120
40
V
IN
=15 to 30V, I
O
=0.5A
V
IN
=21V, I
O
=0.2 to 0.8A
max.
9.18
min.
11.76
SI-8120JD
typ.
12.00
88
V
IN
=24V, I
O
=0.5A
125
V
IN
=24V, I
O
=0.5A
60
10
±1.0
130
V
IN
=18 to 30V, I
O
=0.5A
40
V
IN
=24V, I
O
=0.2 to 0.8A
max.
12.24
(T
a
=25°C)
Unit
V
IN
=15V, I
O
=0.5A
V
IN
=20V, I
O
=0.5A
V
IN
=21V, I
O
=0.5A
V
IN
=24V, I
O
=0.5A
V
%
kH
Z
mV
mV
mV/
°C
A
V
η
Conditions
f
Conditions
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
∆V
O
/∆T
a
I
S1
Conditions
V
SSL
I
SSL
Conditions
I
q
Conditions
I
q(oFF)
Conditions
µ
A
mA
Quiescent Circuit Current
µ
A
*: 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 V
SSL
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 C
3
flows into the ON/OFF control transistor. Therefore, limit the current securely to protect the
transistor if C
3
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
SI-8000JD
5 ON/OFF
5 ON/OFF
C3
5 ON/OFF
C3
V
OUT.
ON/OFF
Soft Start
Soft Start
+V
OUT.
ON/OFF
50
ICs
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