Page 1
N
NIKO-SEM
FEATURES
Low Power-Loss
Voltage Regulators
L1481T-5
TO-220
zLow power-loss(Dropout voltage:Max.0.5
V@ IO=1A)
z Line-up for 5V and 9V output type
z Compact resin package(TO-220 package)
z High-precision output voltage type
(Output voltage precision: ±3.0%)
z Built-in ON/OFF control function
z Built-in overcurrent protection, overheat
protection, ASO protection circuit
z Lead forming type is also available.
APPLICATIONS
z Power supplies for varies electronic
equipment such as AV, OA equipment
TYPICAL APPLICATION
0.24.
6
10.05MAX.
4-(
1.2
2
2
.
0
±
6
.
7
L1481T-
.
XXXXXXX
X
A
M
1
.
9
2
.
N
I
M
1
.
4
1
.
0
±
6
.
3
±
0.23.
NIK
4
O
X
X
Epoxy resin
4-(1.15
±
4-(0.65
±
3-(2.5)
±
)
0.2
0.2
±
0.22.85
5
.
0
±
5
.
5
(1.5)
1
.
X
A
)
M
5
.
4
)
(0.6)
():Typical dimensions
234
1
Internal connection diagram
DC input(Vin)
1
1
Specific IC
3
2
DC output(Vo)
2
GND
3
4
ON/OFF control terminal(Vc)
4
Vin
U1
L1481
Vout
C1
100uF/25V
21
4
3
C2
330uF/16V
ON/OFF signal
High or Open: Output O
Low: Output OFF
- Basic Adjustable Regulator Circuit -
1
JUL-15-2002
Page 2
NIKO-SEM
Low Power-Loss
Voltage Regulators
ABSOLUTE MAXIMUM RATINGS
L1481T-5
TO-220
z Input Supply Voltage, V
z On/Off Control Terminal
Voltage, V
CTRL
(1)
z Power Dissipation
z Junction Temperature
(2)
(1)
IN
20V
20V
1.4W(No Heat Sink)
15W(Infinite heat sink)
150°C
z Operating Ambient
Temperature Range
z Storage Temperature
Range
z Lead Temperature
(Soldering, 10 Seconds)
-20 to 80 °C
-40 to 150 °C
260 °C
zOutput Current 2A
(1) All are open except GND and applicable terminals
(2) Overheat protection may operate at 125<=Tj<=150°C.
ELECTRICAL CHARACTERISTICS (
Unless otherwise specified, TA = 25 °C.)
Parameter Symbol Test Conditions Typical Limits
Output Voltage VO (3), I
OUT
= 1A
(LINE)
(LOAD)
V
V
(4), I
(5)
= 5mA 0.5% 2.5%
OUT
(3), 5mA ≤ I
(3)
=2.7V,(3) 20uA Max
CTRL
(3)
=0.4V,(3)
CTRL
OUT
≤ 2A
0.1% 2.0%
±0.02%/°C
Dropout Voltage VD
Line Regulation REG
Load Regulation REG
Temperature coefficient of
output voltage
ON-state voltage for control
ON-state voltage for control
OFF-state voltage for control
OFF-state voltage for control
TCVO Tj=0 to 125°C, Io=5mA
V
C(ON)
I
C(ON)
V
C(OFF)
I
C(OFF)
Quiescent Current IQ Io=0A,(3)
Ripple Rejection Ratio
RA
Refer to Fig.2 Test Circuit of Ripple
Rejection
55dB 45dB (Min)
5
4.90V
5.20V
0.5V
2.0V min
0.8V Max
-0.4mA Max
10mA Max
Min
Max
(3) L148T-5:Vin=7V
(4) L148T-5:Vin=6~12V
(5) Input voltage shall be the value when output voltage is 95% in comparison with the initial value.
(6) In case of opening control terminal, output voltage turns on.
2
JUL-15-2002
Page 3
°
NIKO-SEM
Low Power-Loss
Voltage Regulators
Typical Performance Characteristics
L1481T-5
TO-220
7
6
5
4
RL=
3
2
1
0
0
5
RL=5
RL=10
∞
Ω
Ω
10
15
50
40
30
20
10
0
0
RL=5
RL=10
RL=
Ω
Ω
∞
105
15
7
6
5
4
3
2
1
0
0.5 1
0
1.5 2
2.5
3
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
-25
250
50 75
100 125
°
%
100
80
60
40
20
0
0
12
3
IN
V =7V
45
6
3
JUL-15-2002
Page 4
NIKO-SEM
Low Power-Loss
Voltage Regulators
L1481T-5
TO-220
20
P
D2
15
D
10
5
P
D1
0
-25
025
P :No heat sink
D1
P :With infi ni te heat sink
D2
°
10050 75
125
10
8
6
4
2
0
-25
025
10050 75
°
125
Fig.1 Test Circuit
Vin
21
L1481
3
0.33uF
Vc
4
Ic
+
A
47uF
A
Iq
Vo
A
Io
V
RL
Fig.2 Test Circuit of Ripple Rejection
+
47uF
Io
L1481
3
21
4
~
47uF
+
JUL-15-2002
~
V
RL
eo
ei
0.33uF
Vin
f = 120Hz (sine wave)
ei(RMS) = 0.5V
Io =1A
RR = 20 log [ei(RMS) / eo(RMS)]
Vin = 7V ( L1481T-5)
4
Page 5
NIKO-SEM
Voltage Regulators
DEVICE SELECTION GUIDE
Low Power-Loss
L1481T-5
TO-220
PIN CONFIGURATIONS
Device
Package
Marking
23
1
L1481T-5
TO-220
L1481T-5
Pin # Function
1 Vin
2 Vo
3 GND
4 ON/OFF Control
5
JUL-15-2002
Page 6
NIKO-SEM
Dimension
A 10.5 H 3.4 3.6 3.8
B 7.4 7.6 7.8 I 4.4 4.6 4.8
C 29.1 J 2.65 2.85 3.05
D 14.1 K 15 15.5 16
Low Power-Loss
Voltage Regulators
TO-220 (4-Lead) MECHANICAL DATA
mm mm
Dimension
Min. Typ. Max.
L1481T-5
TO-220
Min. Typ. Max.
E 2.5 L 4.5
F 0.63 0.65 0.67 M 1.5
G 1.13 1.15 1.17 N 0.6
I
A
J
H
B
C
M
G
K
L
D
F
E
N
6
JUL-15-2002
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