1-1-3 DC/DC Converter ICs
SI-8000HFE Series
Full-Mold, Separate Excitation Step-down Switching Mode
■Features
• Compact full-mold package (equivalent to
TO220)
• Output current: 5.5 A
• High efficiency: 83% typ. (at Vo = 5 V)
• Requires only 4 discrete components
• Built-in reference oscillator (150 kHz)
• Built-in drooping-type-overcurrent and
thermal protection circuits
• Built-in soft start circuit (Output ON/OFF
available)
■Lineup
Part Number
V
O
(V)
I
O
(A)
SI-8008HFE
Variable (0.8 to 15)
5.5
SI-8050HFE
5
■Absolute
Maximum Ratings
Parameter
DC Input Voltage
Symbol
V
IN
P
D1-1
Power Dissipation
P
D1-2
P
D2-1
P
D2-2
Junction Temperature*
Storage Temperature
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to Ambient Air)
T
j
T
stg
Ratings
43
25 (with infinite heatsink)
20 (with infinite heatsink)
2.15 (without heat sink, standalone operation)
1.72 (without heatsink, standalone operation)
+150
–40 to +150
5
58
°C
°C
°C/W
°C/W
W
Unit
V
Limited by thermal protection, T
jmax
=150°C
T
jmax
=125°C
Limited by thermal protection, T
jmax
=150°C
T
jmax
=125°C
Conditions
■Applications
• Onboard local power supplies
• OA equipment
θ
j-c
θ
j-a
*: This product has built-in thermal protection circuits that may operate when the junction temperature rises above 130°C.
The recommended design for the junction temperature during operation is below 125°C.
■Recommended
Operating Conditions
Ratings
Parameter
Input Voltage Range
Output Voltage Range
Output Current Range
Operating Junction Temperature Range
Operating Temperature Range
Symbol
V
IN
V
O
I
O
T
jop
T
op
SI-8008HFE
SI-8050HFE
Unit
(T
a
=25°C)
Vo+3
*1
to 40
0.8 to 24
0 to 5.5
–30 to +125
–30 to +85
8 to 40
5.0
V
V
A
°C
°C
*1: The minimum value of an input voltage range is the higher of 4.5 V or V
O
+ 3 V.
■Electrical
Characteristics
Ratings
Parameter
Output Voltage
Reference Voltage
Temperature Coefficient of Output Voltage
Temperature Coefficient of Reference Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection
Starting Current
Low Level Voltage
ON/OFF Pin*
Outflow Current at
Low Voltage
Symbol
Ratings
(T
a
=25°C)
SI-8008HFE
(at Vo = 5 V)
max.
min.
typ.
0.784
0.800
V
IN
=15V, I
o
=1A
0.816
Vo
V
ADJ
Conditions
min.
4.90
SI-8050HFE
typ.
5.00
Unit
max.
5.10
V
∆Vo/∆T
∆V
ADJ
/∆T
Conditions
V
IN
=15V, I
o
=1A
±0.5
mV/°C
η
Conditions
±0.1
V
IN
=15V, I
o
=1A, T
c
=0 to 100°C
83
V
IN
=15V, I
o
=3A
150
V
IN
=15V, I
o
=3A
60
V
IN
=10 to 30V, I
o
=3A
20
V
IN
=15V, I
o
=0.2 to 5.5A
5.6
V
IN
=15V, I
o
=1A, T
c
=0 to 100°C
83
V
IN
=15V, I
o
=3A
150
V
IN
=15V, I
o
=3A
60
V
IN
=10 to 30V, I
o
=3A
20
V
IN
=15V, I
o
=0.2 to 5.5A
5.6
%
kHz
fo
Conditions
∆V
OLINE
Conditions
80
50
80
50
mV
mV
A
∆V
OLOAD
Conditions
I
S
Conditions
V
IN
=15V
10
V
SSL
=0V
6
V
IN
=15V, I
o
=0A
200
V
IN
=15V, V
SS
=0V
400
0.5
30
V
IN
=15V
10
V
SSL
=0V
6
V
IN
=15V, I
o
=0A
200
V
IN
=15V, V
SS
=0V
400
0.5
30
V
SSL
I
SSL
Conditions
V
µA
mA
µA
I
q
Quiescent Circuit Current
Conditions
I
q(OFF)
Conditions
*: Pin 5 is the SS 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. SS-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 cur-
rent securely to protect the transistor if C3 capacitance is large. The SS pin is pulled up to the
power supply in the IC, so applying the external voltage is prohibited. If the pin is not used,
leave it open.
SI-8000HFE
SI-8000HFE
SI-8000HFE
5 SS
5 SS
C3
5 SS
C3
V
OUT.
ON/OFF
Soft start
Soft start
+V
OUT.
ON/OFF
52
ICs
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