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
■Lineup
Part Number
SI-8015JF
1.59
SI-8033JF
3.3
SI-8050JF
5.0
SI-8120JF
12.0
TO220)
VO (V)*
• Output current: 1.5A
IO (A)
1.5
• High efficiency: 67 to 88%
• Requires only 4 discrete components
* VREF(V) for SI-8015JF
• Internally-adjusted phase correction and
output voltage
■Absolute Maximum Ratings
• Capable of downsize a choke-coil due to IC's
high switching frequency (125kHz).
(Compared with conventional Sanken devices)
Parameter
Symbol
Ratings
43
16.6 (with infinite heatsink)
Unit
V
DC Input Voltage
VIN
PD1
PD2
Tj
W
Power Dissipation
• Built-in foldback-overcurrent and thermal
protection circuits
1.5 (without heatsink, standalone operation)
W
Junction Temperature
+125
–40 to +125
6.0
°C
Storage Temperature
Tstg
θj-c
°C
• Output ON/OFF available (circuit current at
output OFF: 200µA max.)
Thermal Resistance (Junction to Case)
°C/W
• Soft start available by ON/OFF pin
■Applications
• Power supplies for telecommunication equipment
• Onboard local power supplies
■Recommended Operating Conditions
Ratings
Parameter
Symbol
Unit
Conditions
SI-8015JF*
+2 to 40
VO+3 to 40
SI-8033JF
SI-8050JF
SI-8120JF
14 to 40
15 to 40
VIN1
VIN2
IO
V
O
5.3 to 40
6.3 to 40
7 to 40
8 to 40
V
V
IO=0 to 1A
IO=0 to 1.5A
VIN≥VO+3V
DC Input Voltage Range
Output Current Range
0 to 1.5
A
Operating Junction Temperature Range
Tjop
–30 to +125
°C
* SI-8015JF is a variable output voltage type. The variable output voltage range is from 2.5 V to 24 V.
■Electrical Characteristics
(Ta=25°C)
Ratings
Parameter
Symbol
SI-8015JF
typ.
SI-8033JF
typ.
SI-8050JF
SI-8120JF
typ.
Unit
min.
max.
min.
max.
min.
4.90
V
typ.
max.
5.10
min.
max.
*2
VO
1.558
1.59
1.622
3.234
3.30
3.366
5.00
11.76
12.00
12.24
Output Voltage*1
Efficiency
V
Conditions
η
V
IN=12V,
IO
IO
IO
=0.5A
V
V
V
IN=15V,
77
IN=15V,
125
IN=15V,
25
I
O
=0.5A
IN=20V,
82
IN=20V,
125
IN=20V,
40
IN=10 to 30V,
10
=0.5 to 1.5A
0.5
IO=0.5A
V
V
V
IN=24V,
88
IN=24V,
I
O
=0.5A
67
%
Conditions
f
V
IN=12V,
125
=0.5A
=0.5A
I
O
=0.5A
=0.5A
V
V
IO=0.5A
IO
=0.5A
=0.5A
125
IN=24V,
60
Oscillation Frequency
Line Regulation
Load Regulation
kHZ
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
*4
V
IN=12V,
25
I
O
IO=0.5A
IO
80
=0.5A
30
80
=1.0A
30
100
=1.0A
40
130
=1.0A
40
mV
V
IN=8 to 30V,
I
O
V
IN=8 to 30V,
10
I
O
V
IO
V
IN=18 to 30V,
10
IO
10
mV
V
IN=12V,
IO
=0.2 to 0.8A
V
IN=15V,
I
O=0.5 to1.5A
V
IN=20V,
I
O
V
IN=24V,
IO
=0.5 to 1.5A
Temperature Coefficient of
Output Voltage*3
∆VO/∆Ta
0.5
0.5
1.0
mV/°C
Overcurrent Protection
Starting Current
I
S1
1.6
1.6
1.6
1.6
A
V
Conditions
V
IN=12V
V
IN=15V
V
IN=20V
V
V
IN=24V
Low Level Voltage
VSSL
0.5
0.5
0.5
0.5
*5
ON/OFF
Outflow Current
Terminal
I
SSL
100
100
100
100
µA
at Low Voltage
Conditions
V
SSL=0V
7
VSSL=0V
7
VSSL=0V
SSL=0V
7
I
q
7
mA
Quiescent Circuit
Current
Conditions
V
IN=12V,
IO
=0A
200
V
IN=15V,
IO
=0A
200
V
IN=20V,
I
O=0A
VIN=24V, IO=0A
I
q(OFF)
200
200
µA
Conditions
V
IN=12V,
V
ON/OFF=0.3V
V
IN=15V,
VON/OFF=0.3V
V
IN=20V,
V
ON/OFF=0.3V
VIN=24V, VON/OFF=0.3V
*1: Reference voltage for SI-8015JF
*2: VREF for SI-8015JF
*3: Temperature Coefficient of Reference Voltage for SI-8015JF
*4: ∆VREF/∆Ta 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.
SI-8000JF
SI-8000JF
SI-8000JF
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-collec-
tor 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.
5
ON/OFF
5
ON/OFF
C3
5
ON/OFF
C3
VOUT. ON/OFF
Soft start
Soft start
+VOUT. ON/OFF
ICs
34
ETC [ ETC ]
