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SEMICONDUCTOR
TECHNICAL DATA
KIA278R00PI
BIPOLAR LINEAR INTEGRATED CIRCUIT
Revision No : 0
2A ADJUSTABLE LOW DROP VOLTAGE REGULATOR
The KIA278R00PI is a Low Drop Voltage Regulator suitable
for various electronic equipments. It provides constant voltage
power source with TO-220-4 terminal lead full molded PKG.
The Regulator has multi function such as over current protection,
overheat protection.
FEATURES
Adjustable Output Voltage (Range : 1.5~30V)
1.0A Output Low Drop Voltage Regulator.
Built in Over Current Protection, Over Heat Protection Function.
A
F
J
L
D
M
1
2
3
4
1
2
3
4
DC INPUT (V )
DC OUTPUT (V )
GND
ADJUSTABLE
TERMINAL
(V )
IN
O
ADJ
DIM MILLIMETERS
TO-220IS-4
10.00 0.20
15.00 0.20
2.70 0.20
0.60 0.10
3.20 0.20
3.50 0.10
A
B
C
D
E
F
G
15.70 0.20
0.40 0.10
H
14.3+0.2/-0.1
1.45 0.10
1.00 0.10
2.54
4.50 0.20
7.5 0.1
1.50 0.10
J
K
L
M
N
O
P
S
R
8
5
B
C
E
G
H
L
V
V
U
T
K
N
O
R
S
P
+
_
+
_
+
_
1.30 0.1
3-1.00 0.1
1.30 0.1
T
U
V
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
_
+
_
MAXIMUM RATINGS (Ta=25 )
CHARACTERISTIC
SYMBOL
RATING
UNIT
Remark
Input Voltage
V
IN
35
V
-
Output Current
I
OUT
2
A
-
Power Dissipation 1
P
D1
1.5
W
No heatsink
Power Dissipation 2
P
D2
15
W
with heatsink
Junction Temperature
T
j
125
-
Operating Temperature
T
opr
-20 80
-
Storage Temperature
T
stg
-30 125
-
Soldering Temperature (10sec)
T
sol
260
-
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KIA278R00PI
Revision No : 0
BLOCK DIAGRAM
OVER HEAT
PROTECTION
ASO
PROTECTION
BANDGAP
REFERENCE
-
+
1
2
3
V
OUT
4 V
ADJ
V
IN
GND
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, V
IN
=15V, V
O
=10V, I
O
=1A, R
1
=470
(Note1 : V
IN
=0.95V
out
))
CHARACTERISTIC
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Input Voltage
V
IN
-
4.5
-
35
V
Output Voltage
V
O
R
2
=76
to 10.5k
1.5
-
30
V
Load Regulation
Reg Load
I
O
=5mA 2A
-
-
2.0
%
Line Regulation
Reg Line
V
IN
=11V~28V
-
-
2.5
%
Ripple Rejection
R R
C
ref
=0
Refer to Fig.2
45
55
-
dB
C
ref
=3.3 F
55
65
-
Reference Voltage
V
ref
-
1.26
1.29
1.32
V
Temperature cofficient of reference Voltage
T
C
V
ref
T
j
=0~125
-
1.0
-
%
DropOut Voltage
V
D
I
O
=2A (Note1)
-
-
0.5
V
Quiescent Current
I
Q
I
O
=0A
-
-
10
mA
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KIA278R00PI
Revision No : 0
1
2
3
4
A
A
V
0.33
F
I
R
I
q
L
R1
R1
R2
470
R2
o
V = V
x ( 1 + ) = 1.29 x ( 1 + )
OUT
ref
V
IN
47
F
1
2
3
4
A
A
V
0.33
F
I
R
I
Q
L
R1
470
R2
o
IN
47
F
3.3
F
Cref
Fig. 1 Standard Test Circuit
R1
R2
V
Fig. 2 Ripple Rejection Circuit
ein
+
+
_
_
f=120Hz(sine wave)
ei=0.5Vrms
RR=20log(ei/eo)
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KIA278R00PI
Revision No : 0
ref
REFERENCE VOLTAGE DEVIATION
V (mV)
-10
-25
JUNCTION TEMPERATURE T ( C)
j
0
25
50
75
100
125
-5
0
5
10
V =15V
I =1.0A
R1=470
, R2=3.2K
R1=470
, R2=3.2K
IN
O
RELATIVE OUTPUT VOLTAGE (%)
0
0
OUTPUT CURRENT I (A)
O
Fig. 4 I - V
1.0
2.0
3.0
4.0
20
40
60
80
100
O
O
POWER DISSIPATION (W)
AMBIENT TEMPERATURE Ta ( C)
Fig. 3 Ta - P
Note) Oblique line portion : Overheat
protection may operate in this
area.
D
0
-25
0
50
100
150
5
10
15
20
P 1 : No heat sink
p 2 : With infinite heat sink
D
D
P 1
P 2
D
D
OUTPUT VOLTAGE V (V)
INPUT VOLTAGE V (V)
IN
R =5
5
0
0
5
o
R =
L
L
10
10
15
15
JUNCTION TEMPERATURE T ( C)
0
-25
DROPOUT VOLTAGE V (V)
D
j
I =2A
O
0
25
50
75
100
125
0.1
0.2
0.3
0.4
0.5
I =1.5A
O
I =1A
O
I =0.5A
O
JUNCTION TEMPERATURE T ( C)
0
-25
QUIESCENT CURRENT I (mA)
q
j
0
25
50
75
100
125
2
4
6
8
10
V =35V
I =0
IN
O
T =25 C
j
Fig. 5 T - V
j
O
Fig. 7 T - V
j
D
Fig. 8 T - I
j
q
Fig. 6 V - V
IN
O
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KIA278R00PI
Revision No : 0
Fig. 9 f - RR
Fig. 10 I - RR
INPUT RIPPLE FREQUENCY f (kHz)
0.1
0
RIPPLE REJECTION RR (dB)
10
20
30
40
50
60
70
80
1
10
100
RIPPLE REJECTION RR (dB)
OUTPUT CURRENT I (A)
0.1
O
f=120Hz (sine wave)
ei=0.5Vrms
RR=20 log (ei/eo)
0.5
O
1.0
30
40
50
60
70
80
R1=470
, R2=3.2K
Cref=3.3
F
Cref=3.3
F
Cref=0
Cref=0
T =25 C
j
ei=0.5Vrms
RR=20 log (ei/eo)
R1=470
, R2=3.2K
T =25 C
j
I =1A
O
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