1-1-1 Linear Regulator ICs
sBlock
Diagram
SI-3000F
5
T
r1
3
MIC
5
SI-3025F
T
r1
3
MIC
4
Reg.
Reg.
4
ON/OFF
Protection
Amp.
Drive
ON/OFF
Protection
Amp.
Drive
V
REF
2
Equivalent
to LS-TTL
2
Equivalent
to LS-TTL
1
1
sTypical
Connection Diagram
SI-3000F
D
1
*
2
V
O
3
V
IN
5
DC Input
GND
+
*
1
C
1
C
2
OPEN
SI-3000F
2
1
4
+
C
0
DC Output
GND
C
0
*1 C
1
C
2
*2 D
1
SI-3025F
D
1
*
2
V
IN
5
DC Input
GND
+
3
SI-3025F
1
4
R
1
R
2
V
O
*3 R
1
R
2
*
1
C
1
OPEN 2
C
2
*
3
*
3
+
C
0
: Output capacitor (47 to 100
µ
F)
: Oscillation prevention capacitor
(Approx. C
1
: 47
µ
F, C
2
: 0.33
µ
F)
These capacitors are required if the input line contains inductance
or the wiring is long. Especially at low temperatures, tantalum ca-
pacitors are recommended for C
1
and C
0
.
: Protection diode
This diode is required for protection against reverse biasing 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
ADJ
• 1+
(V
ADJ
=2.55V(typ.))
R
2
R
2
must be 2.55kΩ for stable operation.
DC Output
GND
sT
a
-P
D
Characteristics
(Except SI-3240F)
15
(SI-3240F)
20
Infinite heatsink
With Silicone Grease
Heatsink: Aluminum
Infinite heatsink
Power Dissipation P
D
(W)
Power Dissipation P
D
(W)
With Silicone Grease
Heatsink: Aluminum
10
10
20
0
×
20
0
15
200×200×2mm (2.3°C/W)
5
Without heatsink
0
–30
0
(2
.3
°
C
75
/W
(5.
×
7
)
2
°
5
×
C/
2m
W
m
)
(7.
6
°
C
/W
)
0
×
1
00
×
2
×
2
m
m
10 100×100×2mm (5.2°C/W)
75×75×2mm (7.6°C/W)
mm
5
Without heatsink
50
75
100
0
–30
0
25
50
75
100
25
Ambient Temperature T
a
(°C)
P
D
=I
O
•[V
IN
(mean)–V
O
]
Ambient Temperature T
a
(°C)
P
D
=I
O
•[V
IN
(mean)–V
O
]
30
ICs
V
REF
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