1-1-2 Switching Mode Regulator ICs
SI-8000GL Series
sFeatures
Compact, Separate Excitation Step-down Switching Mode Regulator ICs
sAbsolute
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
D*1
T
j
T
stg
Ratings
53
1
+125
–40 to +125
28
100
Unit
V
W
°C
°C
°C/W
°C/W
• DIP 8 pin package
• Output current: 1.5A
• High efficiency: 86% (at V
IN
= 20V, l
O
= 1A, V
O
= 5V)
• Capable of downsize a choke-coil due to IC's
high switching frequency (250kHz). (Com-
pared with conventional Sanken devices)
• The output-voltage-variable type can vary its
output voltage from 1V to 14V because of its
low reference voltage (Vref) of 1V.
• Wide Input Voltage Range (8 to 50V)
• Output ON/OFF available
• Built-in overcurrent protection and thermal
protection circuits
θ
j-c
θ
j-a
*1: Limited by thermal protection.
sApplications
• Onboard local power supplies
• OA equipment
• For stabilization of the secondary-side output voltage of switching power supplies
sRecommended
Operating Conditions
Ratings
Parameter
DC 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-8010GL
(8 or V
O
+3)
*1
to 50
1 to 14
0.02 to 1.5
–30 to +125
–30 to +125
*1: The minimum value of an input voltage range is the higher of either 8V or V
O
+3V.
sElectrical
Characteristics
Ratings
Parameter
Symbol
min.
Reference Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Temperature Coefficient
of Reference Voltage
Overcurrent Protection
Starting Current
Quiescent Circuit Current
Circuit Current at Output OFF
CE/SS
*
Terminal
Low Level Voltage
Terminal Outflow
Current at Low Voltage
V
REF
Conditions
Eff
Conditions
F
OSC
Conditions
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
∆V
REF
/∆T
a
I
S
Conditions
I
q
Conditions
I
q
(
OFF
)
Conditions
V
SSL
I
SSL
Conditions
V
SSL
=0V
V
IN
=12V, V
ON/OFF
=0.3V
0.5
50
1.6
V
IN
=12V
7
V
IN
=12V, I
O
=0A
400
0.97
SI-8010GL (Variable type)
typ.
1.00
V
IN
=12V, I
O
=1A
86
V
IN
=20V, I
O
=1A, V
O
=5V
250
V
IN
=12V, I
O
=1A
20
V
IN
=10 to 30V, I
O
=1A
10
V
IN
=12V, I
O
=0.1 to 1.5A
±0.5
30
40
max.
1.03
(T
a
=25°C)
Unit
V
%
kH
Z
mV
mV
mV/°C
A
mA
µ
A
V
µ
A
*: Pin 2 is the CE/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 V
SSL
or lower. CE/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 C
4
flows into the ON/OFF control transistor. Therefore, limit the current securely to
protect the transistor if C
3
capacitance is large. The CE/SS pin is pulled up to the power
supply in the IC, so applying the external voltage is prohibited.
SI-8000GL
SI-8000GL
SI-8000GL
2 CE/SS
2 CE/SS
C4
2 CE/SS
C4
V
O.
ON/OFF
Soft start
Soft start
+V
O.
ON/OFF
66
ICs
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