UMW
R
UMW LM317
DESCRIPTION
This monolithic integrated circuit is an adjustable 3-terminal
positive voltage regulator designed to supply more than 1.5A
of load current with an output voltage adjustable over a 1.2
to 37V. It employs internal current limiting , thermal shut-down
and safe area compensation.
FEATURE
Internal thermal overload protection
Internal short circuit current limiting
Output transistor safe operating area compensation
TO-220-3L
123
TO-25 2
1. Adj
2. Output
3. Input
SOT-223
Internal Block Diagram
Vin
Input
3
+
-
Voltage
Reference
Protection
Circuitry
Rlimit
2 Vo
Output
1
Vadj
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UMW
Symbol
V
I
-V
O
T
LEAD
P
D
T
J
T
stg
ΔV
O
/ΔT
R
UMW LM317
Absolute Maximum Ratings
Parameter
Input-Output Voltage Differential
Lead Temperature
Power Dissipation
Operating Junction Temperature Range
Storage Temperature Range
Temperature Coefficient of Output Voltage
Value
40
230
Internally limited
0~125
-55~125
±0.02
Unit
V
℃
W
℃
%/
℃
ELECTRICAL CHARACTERISTICS
(V
O
-V
I
=5V,I
O
=0.5A,0℃≤T
J
≤+125℃,I
MAX
=1.5A,P
DMAX
=20W,unless otherwise specified)
Parameter
Line Regulation(note1)
Symbol
R
line
Test
conditions
MIN
TYP
0.01
0.02
18
0.4
40
0.8
46
2.0
1.20
1.25
0.7
3.5
1.0
2.2
0.3
0.003
66
60
75
0.3
5
1
0.01
12
MAX
0.04
0.07
25
0.5
70
1.5
100
5
1.30
µA
V
%/ V
O
mA
A
%/ V
O
dB
%
℃/W
mV
%V
O
UNIT
%/V
T
A
=25℃
3V≤V
I
-V
O
≤40V
3V≤V
I
-V
O
≤40V
T
A
=25℃, 10mA≤I
O
≤I
MAX
V
O
<5V
V
O
≥5V
10mA≤I
O
≤I
MAX
V
O
<5V
V
O
≥5V
-
3V≤V
I
-V
O
≤40V
10mA≤I
O
≤I
MAX
, P
D
≤P
MAX
3V≤V
IN
-V
O
≤40V
10mA≤I
O
≤I
MAX
, P
D
≤P
MAX
-
V
I
-V
O
=40V
V
I
-V
O
≤15V,
P
D
≤P
MAX
V
I
-V
O
≤40V,
P
D
≤P
MAX
T
A
=25℃
T
A
=25℃,10Hz≤f≤10KHz
V
O
=10V, f =120Hz
without C
ADJ
C
ADJ
=10µF(note2)
T
A
=25℃ for end point
mesasurements,1000HR
-
Load Regulation(note1)
R
load
Adjustable Pin Current
Adjustable Pin Current Change
Reference Voltage
Temperature Stability
Minimum Load Current to Maintain
Regulation
Maximum Output Current
RMS Noise,% of V
OUT
Ripple Rejection
Long-Term Stability,T
J
=T
HIGH
Thermal Resistance Junction to case
Notes:
l
ADJ
Δl
ADJ
V
REF
ST
T
I
L(MIN)
I
O(MAX)
e
N
RR
ST
R
θJC
1. Load and line regulation are specified at constant junction temperature. Change in V
D
due to heating effects must
be taken into account separately. Pulse testing with low duty is used.(P
MAX
=20W)
2.C
ADJ
. when used, is connected between the adjustment pin and ground.
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友台半导½有限公司
UMW
R
UMW LM317
Typical Application
C
i
is required when regulator is located an appreciable distance from power supply filter.
C
o
is not needed for stability , however, it does improve transient response.
Since I
ADJ
is controlled to less than 100µA, the error associated with this term is negligible in most applications.
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友台半导½有限公司
UMW
R
UMW LM317
■
TO-220-3L
封裝外½圖
Symbol
A
A1
b
b1
c
c1
D
E
E1
e
e1
F
h
L
L1
Φ
Dimensions In Millimeters
Min
Max
4.470
4.670
2.520
2.820
0.710
0.910
1.170
1.370
0.310
0.530
1.170
1.370
10.010
10.310
8.500
8.900
12.060
12.460
2.540 TYP
4.980
5.180
2.590
2.890
0.000
0.300
13.400
13.800
3.560
3.960
3.735
3.935
Dimensions In Inches
Min
Max
0.176
0.184
0.099
0.111
0.028
0.036
0.046
0.054
0.012
0.021
0.046
0.054
0.394
0.406
0.335
0.350
0.475
0.491
0.100 TYP
0.196
0.204
0.102
0.114
0.000
0.012
0.528
0.543
0.140
0.156
0.147
0.155
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友台半导½有限公司
UMW
R
UMW LM317
■
SOT223
封裝外½圖
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5
友台半导½有限公司
实时操作系统RTOS
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