UNISONIC TECHNOLOGIES CO., LTD
LM317A
MEDIUM CURRENT 1.2V TO
37V ADJUSTABLE VOLTAGE
REGULATOR
DESCRIPTION
The UTC
LM317A
is an adjustable 3-terminal positive voltage
regulator, designed to supply 1.5A of output current with voltage
adjustable from 1.2V ~ 37V.
LINEAR INTEGRATED CIRCUIT
FEATURES
* Output voltage adjustable from 1.2V ~ 37V
* Output current in excess of 1.5A
* Internal thermal overload protection
* Internal short circuit current limiting
* Output transistor safe area compensation
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LM317AL-AA3-R
LM317AG-AA3-R
LM317AL-TA3-T
LM317AG-TA3-T
LM317AL-TN3-R
LM317AG-TN3-R
LM317AL-TQ2-R
LM317AG-TQ2-R
LM317AL-TQ2-T
LM317AG-TQ2-T
Note: Pin Assignment: I: V
IN
O: V
OUT
Package
SOT-223
TO-220
TO-252
TO-263
TO-263
Pin Assignment
1
2
ADJ
O
ADJ
O
ADJ
O
ADJ
O
ADJ
O
3
I
I
I
I
I
Packing
Tape Reel
Tube
Tape Reel
Tape Reel
Tube
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QW-R101-026.C
Copyright © 2009 Unisonic Technologies Co., Ltd
LM317A
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
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QW-R101-026.C
LM317A
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
PARAMETER
SYMBOL
RATINGS
UNIT
Input-Output Voltage Differential
V
IN
-V
OUT
40
V
Power Dissipation
P
D
Internally limited
Junction Temperature
T
J
+125
°C
Operating Temperature
T
OPR
0 ~ +125
°C
Storage Temperature
T
STG
-65 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA
PARAMETER
Junction to Ambient
SOT-223
TO-220
TO-252
TO-263
SOT-223
TO-220
TO-252
TO-263
SYMBOL
θ
JA
RATINGS
140
50
103
62.5
23.5
3
12
3
UNIT
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
Junction to Case
θ
JC
ELECTRICAL CHARACTERISTICS
(V
IN
-V
OUT
=5V, I
OUT
=0.5A, P
MAX
=20W, Ta=25°C, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
Line Regulation
ΔV
OUT
/V
OUT
3V≤V
IN
-V
OUT
≤40V,
I
OUT
=100mA
V
OUT
≤5V
Load Regulation
ΔV
OUT
10mA≤I
OUT
≤1.5A
V
OUT
≥5V
Adjustable Pin Current
I
ADJ
3V≤V
IN
-V
OUT
≤40V,
Adjustable Pin Current Change
ΔI
ADJ
10mA≤I
OUT
≤500mA
3V≤V
IN
-V
OUT
≤40V,
Reference Voltage
V
REF
10mA≤I
OUT
≤1.5A,
P
D
＜P
MAX
Temperature Stability
Minimum Load Current for Regulation
Maximum Output Current
RMS Noise vs. %of V
OUT
Ripple Rejection
I
L(MIN)
I
O(MAX)
eN
RR
T
MIN
≤T
J
≤T
MAX
V
IN
-V
OUT
=40V
V
IN
-V
OUT
=40V, P
D
≤P
MAX
V
IN
-V
OUT
=15V, P
D
＜P
MAX
10H
Z
≤f≤10KH
Z
V
OUT
=10V,f=120H
Z
C
ADJ
=0
C
ADJ
=10μF
66
MIN
TYP
0.01
5
0.1
50
0.2
1.20
1.25
0.7
4.5
0.3
1.5
0.4
2.2
0.003
65
80
MAX
0.04
25
0.5
100
5
1.30
UNIT
%/V
mV
%
μA
μA
V
%/V
OUT
mA
A
A
%/V
OUT
dB
dB
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QW-R101-026.C
LM317A
APPLICATION CIRCUITS
V
IN
3
LINEAR INTEGRATED CIRCUIT
UTC LM317A
I
ADJ
1
2
V
OUT
D1 1N4002
R1
Co
1μF
C1
0.1μF
V
IN
3
UTC
LM317A
1
2
120Ω
1kΩ
V
OUT
1μF
R2
720Ω
V
OUT
=1.25V×(1+R2/R1)+I
ADJ
×R2
C1 is required when regulator is located an
appreciated distance from power supply. Co is
needed to improve transient response.
Fig.1 Programmable voltage regulator
TTL Level
signal
Fig.2 Regulator with On-off control
V
REF
1.25 V
) + I
ADJ
=
R1
R1
1.25 V
V
REF
) + I
ADJ
=
I
O(MIN)
= (
R1+ R2
R1+ R2
5mA < I
OUT
< 100mA
I
O(MAX )
= (
Fig.3 Soft Start Application
Fig.4 Constant Current Application
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QW-R101-026.C
LM317A
TYPICAL CHARACTERISTICS
LINEAR INTEGRATED CIRCUIT
Output Voltage Deviation,
∆V
OUT
(%)
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
Min Output Current, I
OUT
(mA)
Output Current, I
OUT
(A)
Adjustment Current, I
ADJ
(μA)
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QW-R101-026.C
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