D
es
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The 3 17 are adjustable 3 - terminal positive -voltage regulators capable of supplying 1.5A over a differential voltage range of 3Vto
40V. They are exceptionally easy to use and require only two external resistors to set the output voltage.
Both input and output regulation are better than standard fixed regulators.In addition to higher performance than fixed regulators,
these regulators offer full overload protection available only in integrated circuits. Included on the chip are current limit,
thermal overload protection, and safe-area protection. All overload protection circuitry remains fully functional even if
the adjustment terminal is disconnected. Normally, no capacitors are needed unless the device is situated far from
the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient
response.The primary applications of each of these regulators is that of a programmable output regulator, but by
connecting a fixed resistor between adjustment terminal and the output terminal, each device can be used as a
precision current regulator. Even though the regulator is floating and sees only the input-to-output differential voltage,
use of these devices to regulate output voltages that would cause the maximum-rated differential voltage to be exceeded if
the output became shorted to ground is not recommended.
F
u
res
•
Output Voltage Range Adjustable from 1.2 V to 37 V
•
Output Current Capability of 1.5 A Max
•
Input Regulation Typically 0.01 % Per Input - Volt Chan
ge
•
Output Regulation Typically 0.1 %
•
Peak Output Current Constant Over Temperature
Range of Regulator
•
Popular 3-Lead TO-220 Package
•
R
ipple
R
e
j
ec
t
i
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n
T
y
p
i
ca
l
ly
8
0
dB
T
ypical
ap
p
lica
t
ion
da
t
a
V
3
IN
317
OUT
2
V
I
0
AD
J
1
R1
2
40
Ω
(
s
ee
N
o
t
e
C
)
C1
=
0
.
1
F
µ
C2
=
1
(
s
ee
N
o
t
e
A
)
R2
(
s
ee
N
o
t
e
B
)
Note A: Use of an input bypass capacitor is recommended if regulator is far from filter capacitors.
Note B: Use of an output capacitor improves transient response but is optional.
R
Note C: Output voltage is calculated from the equation:
=
V
0
V
ref
+
1
R
1
V
ref
equals
t
h
e
di
ff
e
r
ence
b
et
w
een
t
h
e
ou
t
p
ut
and
ad
j
u
s
t
ment
t
ermi
n
al
1
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A
b
s
o
l
ut
e
Maximum
Ra
t
i
n
gs
OVER OPERATING TEMPERATURE RANGE (UNLESS OTHERWISE NOTED)
Parameter Maximum
Units
Input-to-output differential voltage, V
I
- Vo 40 V
Continuous total dissipation at 25
°
C free-air temperature 2
W
Continuous total dissipation at (or below) 25
°
C case temperature 15
W
Operating free-air, case, or virtual junction temperature range 0 to 125
°
C
Storage temperature range -65 to 150
°
C
Re
c
omm
e
nd
e
d
O
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r
a
t
i
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g
C
o
n
d
i
t
i
o
n
s
Parameter
LM
317
U
n
i
ts
min max
Output current, I
0
10 1500 mA
Operating virtual junction temperature, T
J
0 125
°
C
Ele
ct
r
ic
a
l
C
h
ara
c
t
e
r
i
s
t
ics
Elec
t
ri
c
al
C
har
a
c
t
eris
t
ics
over
re
c
o
mmen
d
ed
r
a
n
g
es
of
o
p
era
t
i
n
g
vir
t
u
al
j
u
nc
t
i
o
n
t
em
p
era
t
u
r
e
(u
n
less
o
t
h
er
w
ise
n
o
t
ed)
(
N
o
t
e
1)
Parameter Test Conditions* 317 Units
Min Typ Max
Input regulation (Note 2) V
I
-V
0
=3 V to 40 V, TJ = MIN to MAX 0.01 0.04 %/ V
(Note 3)
l
0
=
10
mA
t
o
1
.
5
A
0
.
02
0
.
07
R
ipple
r
ej
e
c
t
ion
Vo
=
10
V,
f
=
120
H
z
65
dB
Vo
=
10
V,
f
=
120
H
z
10
-
µ
F
ca
p
aci
t
or
bet
w
e
e
n
A
D
J
and
gro
u
nd
66
80
Output regulation lo = 10 mA to 1.5 A, Vo ≤5 V 5 25
mV
T
J
= 25
°
C, (See Note 3) Vo > 5 V 0.1 0.5
%
lo = 10 mA to 1.5 A, Vo ≤5 V 20 70 mV
(Note 3) Vo > 5 V 0.3 1.5 %
Output voltage change with temperature T
J
= MIN to MAX 1 %
O
u
t
put
vol
t
a
ge
l
ong
-
t
erm
dri
f
t
(
N
o
t
e
4)
A
ft
er
1000
h
at
T
J
=
MAX
and
V
I
-
Vo
=
40
V
0
.
3
1
%
Output noise voltage f= 10 Hz to 10 kHz, T
J
=25
°
C 0.003
%
Minimum output current to maintain regulation V
I
-Vo = 40 V 3.5 10 mA
Peak output current V
I
-Vo ≤15 V 1.5 2.2 A
V
I
-Vo ≤40 V, T
J
=25
°
C 0.15 0.4
Adjus
tment-terminal current 50 100
µ
A
Change in adjustment-terminal current V
I
-Vo=2.5 V to 40 V,
lo = 10 mA to 1.5 A
Reference voltage (output to ADJ ) V
I
-Vo = 3 V to 40 V, lo=10 mA to 1.5 A,
P
≤
15W
0
.
2
5
.
0
µ
A
1
.
2
1
.
25
1
.
3
V
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2
* Unless otherwise noted, these specifications apply for the following test conditions: V
I
- V
0
= 5V and I
0
= 0.5 A. For conditions shown
as MIN or MAX, use the appropriate value specified under recommended operating conditions.
Note 1: All characteristics are measured with a 0.1 -
µ
F capacitor across the input and a 1 -
µ
F capacitor across the output.
Note 2: Input regulation is expressed here as the percentage change in output voltage per 1 - V change at the input.
Note 3: Pulse testing techniques are used to maintain the junction temperature as close to the ambient tempe rature as possible.
Thermal effects must be taken into account separately.
Note 4: Since long-term drift cannot be measured on the individual devices prior to shipment, this specification is not intended to be a
gua
r
an
t
e
e
or
w
arr
a
nt
y
.
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t
is
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nee
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ing
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t
ima
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of
t
he
a
ver
a
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d
r
i
f
t
t
o
be
expec
t
ed
f
r
o
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lot
t
o
lo
t
.
Or
d
e
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g I
n
f
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a
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LM3
17
TO
-
22
0
LM3
17
A
d
dr
e
ss
:
6A06--6A07
Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing
Postalcode:100039
Tel: 86-010-58895780 / 81 / 82 / 83 / 84 Fax : 010-58895793
Http://www.estek.com.cn
Email:sales@estek.com.cn
R
E
V
N
o
:
01
-
0
6
08
08
3
BE
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G
ES
T
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K
ELE
CTR
O
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I
C
S C
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.,
L
T
D