1-1-3 DC/DC Converter ICs
SI-8000JF Series
Full-Mold, Separate Excitation Step-down Switching Mode
■Features
• Compact full-mold package (equivalent to
TO220)
• Output current: 1.5A
• High efficiency: 67 to 88%
• Requires only 4 discrete components
• Internally-adjusted phase correction and
output voltage
• Capable of downsize a choke-coil due to IC's
high switching frequency (125kHz).
(Compared 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
■Lineup
Part Number
V
O
(V)*
I
O
(A)
SI-8015JF
1.59
SI-8033JF
3.3
1.5
SI-8050JF
5.0
SI-8120JF
12.0
* V
REF
(V) for SI-8015JF
■Absolute
Maximum Ratings
Parameter
DC Input Voltage
Power Dissipation
Junction Temperature
Storage Temperature
Thermal Resistance (Junction to Case)
Symbol
V
IN
P
D1
P
D2
T
j
T
stg
Ratings
43
16.6 (with infinite heatsink)
1.5 (without heatsink, standalone operation)
+125
–40 to +125
6.0
Unit
V
W
W
°C
°C
°C/W
θ
j-c
■Applications
• Power supplies for telecommunication equipment
• Onboard local power supplies
■Recommended
Operating Conditions
Ratings
Parameter
DC Input Voltage Range
Output Current Range
Operating Junction Temperature Range
Symbol
V
IN
1
V
IN
2
I
O
T
jop
SI-8015JF*
V
O
+2 to 40
V
O
+3 to 40
SI-8033JF
5.3 to 40
6.3 to 40
0 to 1.5
–30 to +125
SI-8050JF
7 to 40
8 to 40
SI-8120JF
14 to 40
15 to 40
Unit
V
V
A
°C
Conditions
I
O
=0 to 1A
I
O
=0 to 1.5A
V
IN
≥V
O
+3V
* SI-8015JF is a variable output voltage type. The variable output voltage range is from 2.5 V to 24 V.
■Electrical
Characteristics
Ratings
Parameter
Symbol
min.
Output Voltage
*1
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Temperature Coefficient of
Output Voltage
*3
Overcurrent Protection
Starting Current
ON/OFF
*5
Terminal
Low Level Voltage
Outflow Current
at Low Voltage
V
O*2
Conditions
1.558
SI-8015JF
typ.
1.59
67
V
IN
=12V, I
O
=0.5A
125
V
IN
=12V, I
O
=0.5A
25
10
±0.5
1.6
V
IN
=12V
0.5
100
V
SSL
=0V
7
V
IN
=12V, I
O
=0A
200
V
IN
=12V, V
ON/OFF
=0.3V
V
SSL
=0V
7
V
IN
=15V, I
O
=0A
200
V
IN
=15V, V
ON/OFF
=0.3V
1.6
V
IN
=15V
0.5
100
V
SSL
=0V
7
V
IN
=20V, I
O
=0A
200
V
IN
=20V, V
ON/OFF
=0.3V
80
30
V
IN
=8 to 30V, I
O
=0.5A
V
IN
=12V, I
O
=0.2 to 0.8A
max.
1.622
min.
3.234
SI-8033JF
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
=20V
0.5
100
V
SSL
=0V
7
V
IN
=24V, I
O
=0A
200
V
IN
=24V, V
ON/OFF
=0.3V
mA
80
30
V
IN
=8 to 30V, I
O
=1.0A
V
IN
=15V, I
O
=0.5 to 1.5A
max.
3.366
min.
4.90
SI-8050JF
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
=24V
0.5
100
A
V
100
40
V
IN
=10 to 30V, I
O
=1.0A
V
IN
=20V, I
O
=0.5 to 1.5A
max.
5.10
min.
11.76
SI-8120JF
typ.
12.00
88
V
IN
=24V, I
O
=0.5A
125
V
IN
=24V, I
O
=0.5A
60
10
±1.0
130
mV
mV
mV/
°C
40
V
IN
=18 to 30V, I
O
=1.0A
V
IN
=24V, I
O
=0.5 to 1.5A
kH
Z
%
max.
12.24
V
Unit
(T
a
=25°C)
V
IN
=12V, I
O
=0.5A
V
IN
=15V, I
O
=0.5A
V
IN
=20V, I
O
=0.5A
V
IN
=24V, I
O
=0.5A
η
Conditions
f
Conditions
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
∆V
O
/∆T
a*4
I
S1
Conditions
V
SSL
I
SSL
Conditions
I
q
Conditions
I
q(OFF)
Conditions
µ
A
Quiescent Circuit
Current
µ
A
*1: Reference voltage for SI-8015JF
*2: V
REF
for SI-8015JF
*3: Temperature Coefficient of Reference Voltage for SI-8015JF
*4:
∆V
REF
/∆T
a
for SI-8015JF
*5: 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-collec-
tor 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. If this pin is not
used, leave it open.
SI-8000JF
SI-8000JF
SI-8000JF
5 ON/OFF
5 ON/OFF
C3
5 ON/OFF
C3
V
OUT.
ON/OFF
Soft start
Soft start
+V
OUT.
ON/OFF
34
ICs
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