UNISONIC TECHNOLOGIES CO., LTD
LM317L
LOW CURRENT 1.25V TO
37V ADJUSTABLE VOLTAGE
REGULATOR
DESCRIPTION
The UTC
LM317L
is a monolithic integrated circuit,
designed to supply 100mA of output current with voltage
adjustable from 1.25V ~ 37V.
1
SOP-8
LINEAR INTEGRATED CIRCUIT
FEATURES
*Output voltage adjustable from 1.25V ~ 37V.
*Output current in excess of 100mA
*Internal thermal overload protection
*Internal short circuit current limiting
*Output transistor safe area compensation
TO-92
Lead-free:
LM317LK
Halogen-free: LM317LG
ORDERING INFORMATION
Normal
LM317L-T92-B
LM317L-T92-K
LM317L-S08-R
LM317L-S08-T
Ordering Number
Lead Free
LM317LK-T92-B
LM317LK-T92-K
LM317LK-S08-R
LM317LK-S08-T
I:V
IN
O:V
OUT
Halogen Free
LM317LG-T92-B
LM317LG-T92-K
LM317LG-S08-R
LM317LG-S08-T
N: No Connection
Package
TO-92
TO-92
SOP-8
SOP-8
Pin Assignment
1 2 3 4 5 6 7
A O I
- -
- -
A O I - - - -
I O O A N O O
I O O A N O O
Packing
8
- Tape Box
-
Bulk
N Tape Reel
N
Tube
Note: Pin Assignment: A:ADJ
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Copyright © 2008 Unisonic Technologies Co., Ltd
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QW-R101-008.D
LM317L
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
INPUT
V
REF
PROTECTION
CIRCUIT
OUTPUT
V
ADJ
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QW-R101-008.D
LM317L
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
PARAMETER
SYMBOL
RATING
UNIT
Input-Output Differential Voltage
V
IN
-V
OUT
40
V
Power Dissipation
P
D
Internally Limited
Junction Temperature
T
J
+125
°C
Operating Junction Temperature
T
OPR
-40 ~ +85
°C
Storage Temperature Range
T
STR
-40 ~ +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.
ELECTRICAL CHARACTERISTICS
(V
IN
-V
OUT
=5V, I
OUT
=40mA, Ta=25°C, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
Line Regulation
ΔV
OUT
/V
OUT
3V≦V
IN
-V
OUT
≦40V,
I
LOAD
<20mA
V
OUT
≦5V
Load Regulation
ΔV
OUT
5mA≦I
OUT
≦100mA
V
OUT
≧5V
Adjustable Pin Current
Adjustable Pin Current Change
Reference Voltage
Temperature Stability
Minimum Load Current for Regulation
Maximum Output Current
RMS Noise vs. %of V
OUT
I
ADJ
ΔI
ADJ
V
REF
3V≦V
IN
-V
OUT
≦40V,
5mA≦I
OUT
≦100mA,
P
D
＜625mW
3V≦V
IN
-V
OUT
≦40V,
5mA≦I
OUT
≦100mA,
P
D
＜625mW
T
MIN
≦T
J
≦T
MAX
MIN
TYP MAX UNIT
0.01 0.04 %/V
5
25
mV
0.1
0.5
%
50
100
μA
0.2
5
μA
V
1.20 1.25 1.30
V
IN
-V
OUT
=40V
V
IN
-V
OUT
=40V, P
D
≦625mW
10H
Z
≦f≦10KH
Z
C
ADJ
=0
Ripple Rejection
RR
V
OUT
=10V,f=120H
Z
,
C
ADJ
=10μF
Note: C
ADJ
is connected between Adjust pin and Ground.
I
L(MIN)
I
O(MAX)
eN
66
0.7
%/V
OUT
3.5
10
mA
50
mA
0.003 0.01 %/V
OUT
65
dB
80
dB
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 5
QW-R101-008.D
LM317L
APPLICATION CIRCUITS
LINEAR INTEGRATED CIRCUIT
V
IN
3
V
OUT
UTC LM317L
1
V
ADJ
2
D1
1N4001
240
50k
V
IN
3
UTC LM317L
1
2
R1
R2
I
OUT
Vo
UT
I
ADJ
1.25V
V
REF
)+I
ADJ
=
R1
R1
R2
10 F
I
O(MAX)
=(
I
O(MIN)
=(
V
REF
1.25V
)+I
ADJ
=
R1+R2
R1+R2
5mA<I
OUT
<100mA
Fig.3 Soft Start Application
Fig.4 Constant Current Application
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R101-008.D
LM317L
TYPICAL CHARACTERISTICS
Load Regulation vs. temperature
0.2
LINEAR INTEGRATED CIRCUIT
Adjustment Current vs. Temperature
60
Output Voltage Deviation,
∆V
OUT
(%)
Adjustment Current, I
ADJ
(μA)
125
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0
25
50
75
100
V
IN
=15V
V
OUT
=10V
55
50
45
40
35
-50
-25
0
25
50
75
100
125
Temperature
Temperature
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
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QW-R101-008.D
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