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NIKO-SEM
FEATURES
Low Power-Loss Voltage Regulators
L1481T-5
TO-220
Low power-loss(Dropout voltage:Max.0.5 V@ IO=1A) Line-up for 5V and 9V output type Compact resin package(TO-220 package) High-precision output voltage type (Output voltage precision: 3.0%) Built-in ON/OFF control function Built-in overcurrent protection, overheat protection, ASO protection circuit Lead forming type is also available.
4.6 10.05MAX. 4-( 0.2 1.2) 2.85
0.2 0.2
0.2
7.6
29.1MAX.
NIKO L1481T-X XXXXXXXX
3.6 3.4 0.2 0.5 Epoxy resin (1.5) 4-(1.15 0.2) 4.5MAX. (0.6) 4-(0.65 0.2) 3-(2.5)
APPLICATIONS
1
14.1MIN.
():Typical dimensions
2 3 4
Power supplies for varies electronic equipment such as AV, OA equipment
Internal connection diagram
1 2 1 2 Specific IC 3 4 4 3
DC DC GN ON D
input(Vin) output(Vo) /OFF control terminal(Vc)
TYPICAL APPLICATION
U1 L1481 Vin C1 100uF/25V 1 3 2 4 C2 330uF/16V Vout
ON/OFF signal High or Open: Output ON Low: Output OFF
- Basic Adjustable Regulator Circuit -
15.5
1
JUL-15-2002
NIKO-SEM
Low Power-Loss Voltage Regulators
L1481T-5
TO-220
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage, VIN(1) On/Off Control Terminal Voltage, VCTRL(1) Power Dissipation Junction Temperature(2) Output Current
(1) All are open except GND and applicable terminals (2) Overheat protection may operate at 125<=Tj<=150C.
20V 20V
1.4W(No Heat Sink)
15W(Infinite heat sink)
Operating Ambient Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 Seconds)
-20 to 80 C
-40 to 150 C 260 C
150C 2A
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA = 25 C.)
Parameter Output Voltage Dropout Voltage Line Regulation Load Regulation
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
Symbol VO
Test Conditions
(3), IOUT = 1A
Typical 5 0.5% 0.1%
0.02%/C
Limits 4.90VMin 5.20VMax 0.5V 2.5% 2.0% 2.0V min 20uA Max 0.8V Max
-0.4mA Max 10mA Max
(5) VD REG(LINE) (4), IOUT = 5mA REG(LOAD) (3), 5mA IOUT 2A
Quiescent Current Ripple Rejection Ratio
(3) L148T-5:Vin=7V (4) L148T-5:Vin=6~12V
TCVO VC(ON) IC(ON) VC(OFF) IC(OFF) IQ RA
Tj=0 to 125C, Io=5mA
(3)
VCTRL=2.7V,(3)
(3)
VCTRL=0.4V,(3) Io=0A,(3) Refer to Fig.2 Test Circuit of Ripple Rejection
55dB
45dB (Min)
(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
NIKO-SEM
Low Power-Loss Voltage Regulators
L1481T-5
TO-220
Typical Performance Characteristics
7 6
50 40
5 4 3 2 1 0 5 10 15 0 30
RL= RL=5 RL=10
20 10
RL=5 RL=10 RL=
0
0
5
10
15
5.06
7
5.04
6
5.02
5
5.00
4
4.98
3
4.96
2 1 0 0.5 1 1.5 2 2.5 3
4.94 4.92
0
-25
0
25
50
75
100
125
%
100 80 VIN =7V 60
40 20
0
0
1
2
3
4
5
6
3
JUL-15-2002
NIKO-SEM
Low Power-Loss Voltage Regulators
L1481T-5
TO-220
20
P :No heat sink D1 P D2 P :W infinite heat sink ith D2
10 8 6
D
15
10
4
5
2
P D1
0 -25 0 25 50 75
100
125
0
-25
0
25
50
75
100
125
Fig.1 Test Circuit
Vin
1 2
Fig.2 Test Circuit of Ripple Rejection
1 2
L1481
4 3
Vc
A
0.33uF
+
Io 47uF
A
Iq
0.33uF
47uF
RL
RL
Vin
f = 120Hz (sine wave) Io =1A ei(RMS) = 0.5V Vin = 7V ( L1481T-5) RR = 20 log [ei(RMS) / eo(RMS)]
4
JUL-15-2002
~
V
~
Ic
A
ei
L1481
4 3
Io
+
47uF
+
Vo
V
eo
NIKO-SEM
Low Power-Loss Voltage Regulators
L1481T-5
TO-220
DEVICE SELECTION GUIDE
Device Package Marking L1481T-5 TO-220 L1481T-5
PIN CONFIGURATIONS
123
Pin # 1 2 3 4
Function Vin Vo GND ON/OFF Control
5
JUL-15-2002
NIKO-SEM
Low Power-Loss Voltage Regulators TO-220 (4-Lead) MECHANICAL DATA
mm mm Min. 3.4 4.4 2.65 15 Typ. 3.6 4.6 2.85 15.5 4.5 1.5 0.6
I A J
L1481T-5
TO-220
Dimension A B C D E F G
Min. 7.4
Typ. 10.5 7.6 29.1 14.1 2.5
Max. 7.8
Dimension H I J K L
Max. 3.8 4.8 3.05 16
0.63 1.13
0.65 1.15
0.67 1.17
M N
B
H
M C G F L D E N
K
6
JUL-15-2002

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