1-1-3 DC/DC Converter ICs
SI-8000TM Series
■Features
Surface-Mount, Separate Excitation Step-down Switching Mode
■Absolute
Maximum Ratings
Parameter
DC Input Voltage
Power Dissipation
Junction Temperature
*
Storage Temperature
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to
Ambient Air)
Symbol
V
IN
P
D1
P
D2
T
j
T
stg
Ratings
43
1.06
1.65
–30 to +150
–40 to +150
6
95
Unit
V
W
°C
°C
°C/W
°C/W
When mounted on glass-epoxy board (900 mm
2
copper area 4.3%)
When mounted on glass-epoxy board (900 mm
2
copper area 4.3%)
When mounted on glass-epoxy board (900 mm
2
copper area 50%)
Conditions
• Compact surface-mount package (TO252-5)
• Output current: 1.5 A
• High efficiency: 81% typ. (at Vo = 5 V)
• Requires only 4 discrete components
• Built-in reference oscillator (300 kHz)
• Built-in drooping-type-overcurrent and thermal
protection circuits
• Output ON/OFF available (circuit current at
output OFF: 200
µ
A typ.)
• Soft start available by ON/OFF pin
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.
■Applications
• Onboard local power supplies
• AV equipment
• OA equipment
■Recommended
Operating Conditions
Ratings
Parameter
Input Voltage Range
Output Voltage
Output Current Range
Operating Junction Temperature Range
Operating Temperature Range
Symbol
V
IN
V
O
I
O
T
jop
T
op
SI-8008TM
V
O
+3*
1
to 40
0.8 to 24
0 to 1.5
–20 to +100
–20 to +85
Unit
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
Rating
Parameter
Symbol
(T
a
=25°C)
Reference Voltage
Temperature Coefficient of
Reference Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection Starting Current
V
ADJ
Conditions
∆V
ADJ
/∆
T
Conditions
min.
0.784
η
Conditions
SI-8008TM
typ.
0.800
V
IN
=15V, I
o
=0.1A
±0.1
V
IN
=15V, I
o
=0.1A, T
c
=
0 to 100°C
81
V
IN
=15V, I
o
=0.5A
Unit
max.
0.816
V
mV/°C
%
kHz
fo
Conditions
∆
V
OLINE
Conditions
∆
V
OLOAD
Conditions
300
V
IN
=15V, I
o
=0.5A
60
V
IN
=10
to
30V, I
o
=0.5A
10
V
IN
=15V, I
o
=0.2
to
1.5A
1.6
80
mV
mV
A
40
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
40
Low Level Voltage
V
SSL
ON/OFF Pin*
Outflow Current
at Low Voltage
V
µ
A
I
SSL
Conditions
I
q
Quiescent Circuit Current
Conditions
mA
µ
A
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
current 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-8000TM
SI-8000TM
SI-8000TM
5 SS
5 SS
C3
5 SS
C3
V
O.
ON/OFF
Soft start
Soft start
+V
O.
ON/OFF
18
ICs
MCU
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