*1: "A" may be indicated to the right of the Sanken logo.
*2: V
IN(max)
and I
O(max)
are restricted by the relation P
D(max)
=(V
IN
-V
O
)•I
O
=14(W).
*3: Refer to the dropout voltage.(Refer to Setting DC Input Voltage on page 7.)
*4: I
S
1 is specified at –5(%) drop point of output voltage V
O
on the condition that V
IN
=V
O
+3V, I
O
=0.5A.
*5: Output is ON even when output control terminal VC is open. Each input level is equivalent to LS-TTL. Therefore, it may be directly driven by an
LS-TTL circuit.
*6: When setting output voltage to 5V or less, input voltage needs to be set to 6V or over to operate stably.
*7: A foldback type overcurrent protection circuit is built into the IC regulator. Therefore, avoid using it for the following applications as it may cause
starting errors:
(1) Constant current load (2) Plus/minus power (3) Series power (4) V
O
adjustment by raising ground voltage
34
qSI-3000F
Series
sElectrical
Characteristics (SI-3025F)
Ratings
Parameter
Input Voltage
Output Voltage
Reference Voltage
Symbol
min.
V
IN
V
O
V
REF
V
DIF
Dropout Voltage
Conditions
Conditions
Line Regulation
Load Regulation
Temperature Coefficient
of Reference Voltage
Ripple Rejection
Quiescent Circuit
Current
Overcurrent Protection
Starting Current
*4,7
Control Voltage (Output ON)
Control Voltage (Output OFF)
V
C
Control Current
*5
Terminal (Output ON)
Control Current
(Output OFF)
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
∆V
REF
/∆T
a
Conditions
R
REJ
Conditions
I
q
Conditions
I
S1
Conditions
V
C.
IH
V
C.
IL
I
C.
IH
Conditions
I
C.
IL
Conditions
V
C
=0.4V
V
C
=2.7V
2.0
1.2
V
IN
=V
O
+3V
V
IN
=V
O
+3V, I
O
=0 to 1.0A
±0.5
V
IN
=V
O
+3V, I
O
=5mA, T
j
=0 to 100°C
54
V
IN
=V
O
+3V, f=100 to 120H
Z
3
V
IN
=V
O
+3V, I
O
=0A
V
IN
=V
O
+1 to 25V, I
O
=0.5A
I
O
≤0.5A
6
*6
3
2.45
2.55
SI-3025F
typ.
(T
a
=25°C unless otherwise specified)
Unit
max.
25
*2
24
2.65
0.5
V
1.0
V
V
V
I
O
≤1.0A
10
20
mV/V
mV/V
mV/°C
dB
10
mA
A
V
0.8
20
–0.3
µA
mA
sOutline
Drawing
φ
3.2
±0.2
0.5
10.0
±0.2
4.2
±0.2
±0.2
2.8
(unit:mm)
4.0
±0.2
7.9
±0.2
Part Number
Lot Number
16.9
±0.3
(17.9)
2.6
(2.0)
±0.1
Plastic Mold Package Type
Flammability: UL94V-0
Weight: Approx. 2.3g
Terminal Connections
q
GND
w
V
C
e
V
O
r
V
OS
t
V
IN
(Only SI-3025F)
q
GND
w
V
C
e
V
O
r
V
REF
t
V
IN
0.95
±0.15
0.85
–0.1
(4.6)
+0.2
+0.2
0.45
–0.1
P1.7
±0.7
×4=6.8
±0.7
3.9
±0.7
(4.3)
8.2
±0.7
1 2 3 4 5
Forming No. 1101
(8.0)
5.0
±0.6
35
qSI-3000F
Series
sBlock
Diagram
SI-3000F
5
T
r1
3
MIC
5
SI-3025F
T
r1
3
MIC
4
Reg.
Reg.
4
Amp.
Drive
ON/OFF
ON/OFF
Protection
Protection
V
REF
Amp.
Drive
2
Equivalent
to LS-TTL
2
Equivalent
to LS-TTL
1
1
sStandard
External Circuit
SI-3000F
D
1
*
2
C
0
5
+
DC Input
V
IN
3
SI-3000F
2
1
4
+
C
0
DC Output
V
O
: Output capacitor (47 to 100µF)
: Oscillation prevention capacitor
(C
1
: Approx. 47µF, C
2
: 0.33µF)
These capacitors are required if the input line is inductive
and in the case of long wiring. Tantalum capacitors are rec-
ommended for C
1
and C
0
, particularly at low temperatures.
: Protection diode
This diode is required for protection against reverse bias-
ing of the input and output. Sanken EU2Z is recommended.
: External resistor for setting output voltage
Relationship between output voltage V
O
and external re-
sistors R
1
and R
2
is as follows.
R
1
V
O
=V
REF
• 1+
(V
REF
=2.55V(typ.))
R
2
R
2
must be 2.55kΩ for stable operation.
*
1
C
1
C
2
OPEN
*1 C
1
C
2
*2 D
1
SI-3025F
D
1
*
2
*3 R
1
R
2
3
5
DC Input
V
IN
+
*
1
C
1
OPEN 2
C
2
SI-3025F
1
4
R
1
R
2
*
3
*
3
+
C
0
DC Output
V
O
sT
a
-P
D
Characteristics
15
Infinite heatsink
With Silicon Grease
Heatsink: Aluminum
20
Power Dissipation P
D
(W)
10
0
×
20
5
Without heatsink
0
–30
0
m
(2
×
2
.3
mm
°
C
75
/W
(5.
×
7
)
2
°
5
×
C/
2m
W
m
)
(7.
6
°
C
/W
)
10
0
0
×
×
1
00
2m
25
50
75
100
Ambient Temperature T
a
(°C)
P
D
=I
O
•[V
IN
(mean)–V
O
]
36
V
REF
qSI-3000F
Series
External Variable Output Voltage Circuit
(Excluding SI-3025F)
1. Variable output voltage with a single external resistor
V
IN
5
3
V
O
35
+
OPEN
2
47µF
SI-3000F
1
4
I
REX
R
EX
V
04
V
IN
=V
O
+1V
+
47µF
25
30
2
SI-3
40F
GND
GND
Output Voltage V
O
(V)
SI-3
20
F
150
120
F
The output voltage may be increased by inserting resistor R
EX
between
terminals No.4 (sensing terminal) and No.3 (output terminal). The cur-
rent I
REX
flowing into terminal No.4 is 1mA (typ.), therefore the adjusted
output voltage V
OUT
is:
V
O
=V
04
+I
REX
•R
EX
*V
04
: output voltage of SI-3000F series
However, the built-in resistor (between terminals No. 4 and No.1) is a
semiconductor resistor, which has approximately thermal characteris-
tics of +0.2%/°C.
It is important to keep the thermal characteristics in mind when adjust-
ing the output voltage.
2. Variable output voltage with two external resistors
V
IN
5
3
V
O
SI-3
15
SI-3
090
F
F
SI-3
10
050
5
0
2
4
6
8
10
External Resistor R
EX
(kΩ)
+
OPEN
2
47µF
SI-3000F
1
4
I
REX1
R
EX1
V
04
+
47µF
35
0F
324
SI-
2
=6k
Ω
R
EX
I
4IN
GND
R
EX2
GND
V
IN
=V
O
+1V
30
Output Voltage V
O
(V)
The output voltage may be increased by inserting resistors R
EX1
be-
tween terminals No.4 (sensing terminal) and No.3 (output terminal) and
R
EX2
between terminals No.4 and No.1 (ground terminal).
The current I
4IN
flowing into terminal No.4 is 1mA (typ.) so the thermal
characteristics may be improved compared to the method shown in 1
by setting the external current I
REX1
at approximately 5 times the value
of I
4IN
(stability coefficient S=5).
The adjusted output voltage V
OUT
in this case is:
V
O
=V
04
+R
EX1
•I
REX1
I
REX1
=S•I
4IN
The value of the external resistors may be obtained as follows:
V
O
-V
04
V
04
R
EX1
=
R
EX2
=
S•I
4IN
,
(S-1)•I
4IN
*V
04
: Output voltage of SI-3000F series
S: Stability coefficient of I
4IN
(may be set to any value)
25
20
15
F
150
Ω
SI-
X
3
=3.75k
R
E 2
F
120
SI-3
2
=3k
Ω
R
EX
F
090
5k
Ω
SI-3
2
=2.2
X
R
E
0F
305
5k
Ω
SI-
X2
=1.2
10
R
E
5
0
1.0
2.0
External Resistor R
EX1
(kΩ)
Note: In the SI-3000F series, the output voltage increase can be ad-
justed as mentioned above. However, when the rise is set to ap-
proximately 10V compared to output voltage V
04
, the necessary
output current may not be obtained due to the S.O.A. protection
