34 ICs
1-1-3 DC/DC Converter ICs
*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 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.
*1: Reference voltage for SI-8015JF *3: Temperature Coefficient of Reference Voltage for SI-8015JF
*2: VREF for SI-8015JF *4: ∆VREF/∆Ta for SI-8015JF
SI-8000JF SI-8000JF
ON/OFF5 ON/OFF5 ON/OFF
C3C3
5
V
OUT.
ON/OFF Soft start Soft start
+V
OUT.
ON/OFF
SI-8000JF
■Lineup
Part Number SI-8015JF SI-8033JF SI-8050JF SI-8120JF
VO (V)* 1.59 3.3 5.0 12.0
IO (A) 1.5
■Absolute Maximum Ratings
Unit
V
W
W
°C
°C
°C/W
Ratings
43
16.6 (with infinite heatsink)
1.5 (without heatsink, standalone operation)
+125
–40 to +125
6.0
Symbol
VIN
PD1
PD2
Tj
Tstg
θ
j-c
Parameter
DC Input Voltage
Power Dissipation
Junction Temperature
Storage Temperature
Thermal Resistance (Junction to Case)
■Recommended Operating Conditions
Parameter
DC Input Voltage Range
Output Current Range
Operating Junction Temperature Range
Symbol
VIN1
VIN2
IO
Tjop
Unit
V
V
A
°C
Ratings
SI-8015JF* SI-8033JF SI-8050JF SI-8120JF
V
O
+2 to 40
5.3 to 40 7 to 40 14 to 40
VO+3 to 40 6.3 to 40 8 to 40 15 to 40
0 to 1.5
–30 to +125
■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
* 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)
Conditions
IO=0 to 1A
IO=0 to 1.5A
VIN≥VO+3V
Full-Mold, Separate Excitation Step-down Switching Mode
SI-8000JF Series
■Applications
•Power supplies for telecommunication equipment
•Onboard local power supplies
* VREF(V) for SI-8015JF
Unit
V
%
kH
Z
mV
mV
mV/°C
A
V
µ
A
mA
µ
A
Parameter
Output V oltage
*1
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection
Starting Current
ON/OFF
*5
Low Level Voltage
Terminal
Outflow Current
at Low Voltage
Quiescent Circuit
Current
Symbol
V
O*2
Conditions
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
Ratings
SI-8015JF SI-8033JF SI-8050JF SI-8120JF
min. typ. max. min. typ. max. min. typ. max. min. typ. max.
1.558 1.59 1.622 3.234 3.30 3.366 4.90 5.00 5.10 11.76 12.00 12.24
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
67 77 82 88
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
125 125 125 125
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
25 80 25 80 40 100 60 130
V
IN
=8 to 30V, I
O
=0.5A V
IN
=8 to 30V, I
O
=1.0A V
IN
=10 to 30V, I
O
=1.0A V
IN
=18 to 30V, I
O
=1.0A
10 30 10 30 10 40 10 40
V
IN
=12V, I
O
=0.2 to 0.8A V
IN
=15V, I
O
=0.5 to 1.5A V
IN
=20V, I
O
=0.5 to 1.5A V
IN
=24V, I
O
=0.5 to 1.5A
±0.5 ±0.5 ±0.5 ±1.0
1.6 1.6 1.6 1.6
V
IN
=12V V
IN
=15V V
IN
=20V V
IN
=24V
0.5 0.5 0.5 0.5
100 100 100 100
V
SSL
=0V V
SSL
=0V V
SSL
=0V V
SSL
=0V
7777
V
IN
=12V, I
O
=0A V
IN
=15V, I
O
=0A V
IN
=20V, I
O
=0A V
IN
=24V, I
O
=0A
200 200 200 200
V
IN
=12V, V
ON/OFF
=0.3V V
IN
=15V, V
ON/OFF
=0.3V V
IN
=20V, V
ON/OFF
=0.3V V
IN
=24V, V
ON/OFF
=0.3V
Temperature Coefficient of
Output V oltage
*3
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35
ICs
■External Dimensions (TO220F-5)
Forming No.1101
10.0±0.2 4.2±0.2
0.95±0.15
8.2±0.7
2.6±0.1
3.9±0.7 (4.3)
(4.6)
(8.0)
(17.9)
(2.0)
0.85+0.2
–0.1
0.45+0.2
–0.1
4.0±0.2
7.9±0.2
16.9±0.3
0.5
12345
P1.7±0.7×4=6.8±0.7
2.8±0.2
3.2
±0.2
φ
(Unit : mm)
Pin Assignment
qVIN
wSWOUT
eGND
rVOS
tON/OFF
Plastic Mold Package Type
Flammability: UL94V-0
Product Mass: Approx. 2.3g
■Block Diagram
4
3
GND
2
V
IN
ON/OFF
SW OUT
1
5PReg. OCP
8033JF, 8050JF, 8120JF
Reset
OSC
+
–
Comp.
Error Amp.
Latch&
Drive
TSD
ON/OFF
Soft
Start
V
REF
+
–
4
3
GND
2
V
IN
V
REF
ON/OFF
SW OUT
1
5PReg. OCP
Reset
OSC
+
–
Comp.
Error Amp.
Latch&
Drive
TSD
ON/OFF
Soft
Start
V
REF
+
–
SI-8015JF
■Typical Connection Diagram
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 : RK16 (Sanken)
C1:50V/220
µ
F
C2:25V/470
µ
F
C3:10V/0.47
µ
F (Only when using soft-start function)
C4:6800pF
L1:100
µ
H
Di : RK16 (Sanken)
V
IN
220µFDi REF
L1
470µF
V
IN
GNDON/OFF
GND
SI-8015JF
SW
V
REF
I
REF
R
1
R
2
C
4
12
4
35
+ +
V
OUT
GND
SI-8015JF
V
IN
C
1
C
3
Di
L1
C
2
V
IN
GNDON/OFF
GND
SI-8000JF
SW
V
S
12
4
35
+ +
V
OUT
GND
8033JF, 8050JF, 8120JF
IREF shall be approx. 2mA.
VOUT= VREF × (R1+R2)
R2
SI-8000JF Series
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