1/13December 2005
■OUTPUT VOLTAGE RANGE: 1.2 TO 37V
■OUTPUT CURRENT IN EXCESS OF 100 mA
■LINE REGULATION TYP. 0.01%
■LOAD REGULA TION TYP. 0.1%
■THERMAL OVERLOAD PROTECTION
■SHORT CIRCUIT PROTECTION
■OUTPUT TRANSISTOR SAF E ARE A
COMPENSATION
■FLOATING OPERATION FOR HIGH
VOLTAGE APPLICATIONS
DESCRIPTION
The LM217L/LM317L are monolithic integrated
circuit in SO-8 and TO-92 packages intended for
use as positive adjustable voltage regulators.
They are designed to supply until 100 mA of load
current with an output voltage adjustable over a
1.2 to 37V range.
The nominal output voltage is selected by means
of only a resistive divider, making the device
exceptionally easy to use and eliminating the
stock ing of many fixed regulators
LM217L
LM317L
LOW CURRENT
1.2 TO 37V ADJUSTABLE VOLTAG E REGUL ATO R
Fi gure 1: Sc hematic Diagram
TO-92 SO-8
Rev. 3
LM217L/LM317L
2/13
Table 1: Absolute Maximum Ratings
Fi gure 2: Pin Connect ion (top view)
Table 2: Order Codes
(* ) A vailable in Tape & Reel wit h the suf fix "-TR" .
(#) Availab l e i n T ape & Reel wi t h the suffix "-TR" and in A m m o pak wit h the suffix "- AP". Please not e that in the se cases pins are shaped
according t o Tape & Re el specific ations.
Fi gure 3: Test C i rcui t
Symbol Parameter Value Unit
VI - VOInput-Output Differential Voltage 40 V
PdPower Dissipation Internally Limited
Topr Operating Junction T emperature
Range for LM217L -40 to 125 °C
for LM317L 0 to 125
Tstg Storage Temperature Range -55 to 150 °C
TYPE SO-8 (TUBE) (*) TO-92 (BAG) (#)
LM217L LM217LD LM217LZ
LM317L LM317LD LM317LZ
SO-8 TO-92
PIN 1 = ADJUST
PIN 2 = IN
PIN 3 = OUT BOTTOM VIEW
LM217L/LM317L
3/13
Table 3: Electrical Characteristics Of LM217L (refe r to th e tes t circui ts, TJ = - 40 to 125°C,
VI - VO = 5 V , I O = 40 mA, u nless otherwise specified).
(* ) CADJ is connected between Adjust pi n and Ground.
Symbol Parameter Test Conditions Min. Typ. Max. Unit
∆VOLine Regulation VI - VO = 3 to 40 V
IL < 20 mA TJ = 25°C 0.01 0.02 %/V
0.02 0.05
∆VOLoad Regulation VO ≤ 5 V
IO = 5 to 100 mA TJ = 25°C 5 15 mV
20 50
VO ≥ 5 V
IO = 5 to 100 mA TJ = 25°C 0.1 0.3 %
0.3 1
IADJ Adjustment Pin Current 50 100 µA
∆IADJ Adjustment Pin Current VI - VO = 3 to 40 V IO = 5 to 100 mA
Pd < 625 mW 0.2 5 µA
VREF Reference Voltage VI - VO = 3 to 40 V IO = 10 to 500 mA
Pd < 625 mW 1.21.251.3 V
∆VO/VOOutput Voltage
Temperature Stability 0.7 %
IO(min) Minimum Load Current VI - VO = 40 V 3.5 5 mA
IO(max) Maximum Output Current VI - VO = 3 to 13 V 100 200 mA
VI - VO = 40 V 50
eN Output Noise Voltage B = 10 Hz to 10 KHzTJ = 25°C 0.003 %
SVR Supply Vo ltage Rejection (*) TJ = 25°C
f = 120 Hz CADJ = 0 65 dB
CADJ = 10 µF 66 80
LM217L/LM317L
4/13
Table 4: Electrical Characteristics Of LM317L (refe r to th e tes t circui ts, TJ = 0 to 125°C,
VI - VO = 5 V , I O = 40 mA, u nless otherwise specified).
(* ) CADJ is connected between Adjust pi n and Ground.
Fi gure 4: Current Limit
Fi gure 5: Minimum Operating Current
Symbol Parameter Test Conditions Min. Typ. Max. Unit
∆VOLine Regulation VI - VO = 3 to 40 V
IL < 20 mA TJ = 25°C 0.01 0.04 %/V
0.02 0.07
∆VOLoad Regulation VO ≤ 5 V
IO = 5 to 100 mA TJ = 25°C 5 25 mV
20 70
VO ≥ 5 V
IO = 5 to 100 mA TJ = 25°C 0.1 0.5 %
0.3 1.5
IADJ Adjustment Pin Current 50 100 µA
∆IADJ Adjustment Pin Current VI - VO = 3 to 40 V IO = 5 to 100 mA
Pd < 625 mW 0.2 5 µA
VREF Reference Voltage VI - VO = 3 to 40 V IO = 5 to 100 mA
Pd < 625 mW 1.21.251.3 V
∆VO/VOOutput Voltage
Temperature Stability 0.7 %
IO(min) Minimum Load Current VI - VO = 40 V 3.5 5 mA
IO(max) Maximum Output Current VI - VO = 3 to 13 V 100 200 mA
VI - VO = 40 V 50
eN Output Noise Voltage B = 10 Hz to 10 KHzTJ = 25°C 0.003 %
SVR Supply Vo ltage Rejection (*) TJ = 25°C
f = 120 Hz CADJ = 0 65 dB
CADJ = 10 µF 66 80
LM217L/LM317L
5/13
APPLICATION INFORMATION
The LM317L provides an internal reference
voltage of 1.25V between the output and
adjustments terminals. This is used to set a
constant current flow across an external resistor
divider (see fig. 4), giving an output voltage VO of:
VO = VREF (1 + R2/R1) + IADJ R2
The device was designed to minimize the term
IADJ (100µ A ma x) and to maintain it very constant
with line and load changes. Usually, the error term
IADJ × R2 can be neglected. To obtain the previous
requirem ent, all the re gulator quiescent current is
returned to the output terminal, imposing a
minimum load current condition. If the load is
insufficient, the output voltage will rise.
Since the LM317L is a floating regulator and
"sees" only the input-t o-output differential vol tage,
supplies of very high voltage with respect to
gro und can be regulated as long as the maxim um
input-to-output differential is not exceeded.
Furthermore, programmable regulator are easily
obtainable and, by connecting a fixed resistor
between the adjustment and output, the device
can be used as a precision current regulator. In
order to optimize the load regulation, the current
set resistor R1 (see fig. 4) should be tied as close
as possible to the regulator, while the ground
terminal of R2 should be near the ground of the
load to provide remote ground se nsing.
Figur e 6: Basic Adjustable Regulator
Figur e 7: Voltage Reg ulator with Protection Diodes
LM217L/LM317L
6/13
Fi gure 8: Slow Turn-on 1 5V Regu l a tor
Fi gure 9: Current R egula tor
Fi gure 10: 5V El ectr onic Shut-d own Regula t or
1.25V

R1
Vref
IO =  + IADJ ≈
R1
LM217L/LM317L
7/13
Figure 11: Digital ly Selected Outputs
(R2 = sets maximum VO)
LM217L/LM317L
8/13
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 1.35 1.75 0.053 0.069
A1 0.10 0.25 0.04 0.010
A2 1.10 1.65 0.043 0.065
B 0.33 0.51 0.013 0.020
C 0.19 0.25 0.007 0.010
D 4.80 5.00 0.189 0.197
E 3.80 4.00 0.150 0.157
e 1.27 0.050
H 5.80 6.20 0.228 0.244
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
k ˚ (max.)
ddd 0.1 0.04
SO-8 MECHANICAL DATA
0016023/C
8
LM217L/LM317L
9/13
DIM. mm. mils
MIN. TYP MAX. MIN. TYP. MAX.
A 4.32 4.95 170.1 194.9
b 0.36 0.51 14.2 20.1
D 4.45 4.95 175.2 194.9
E 3.30 3.94 129.9 155.1
e 2.41 2.67 94.9 105.1
e1 1.14 1.40 44.9 55.1
L 12.7 15.49 500.0 609.8
R 2.16 2.41 85.0 94.9
S1 0.92 1.52 36.2 59.8
W 0.41 0.56 16.1 22.0
α5°5°
TO-92 MECHANICAL DATA
0102782/D
LM217L/LM317L
10/13
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 2.362
T 22.4 0.882
Ao 8.1 8.5 0.319 0.335
Bo 5.5 5.9 0.216 0.232
Ko 2.1 2.3 0.082 0.090
Po 3.9 4.1 0.153 0.161
P 7.9 8.1 0.311 0.319
Tape & Reel SO-8 MECHANICAL DATA
LM217L/LM317L
11/13
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A1 4.80 0.189
T 3.80 0.150
T1 1.60 0.063
T2 2.30 0.091
d 0.48 0.019
P0 12.5 12.9 0.492 0.508
P2 5.65 7.05 0.222 0.278
F1, F2 2.44 2.54 2.94 0.096 0.100 0.116
delta H ±2 0.079
W 17.5 18.00 19.0 0.689 0.709 0.748
W0 5.7 6.3 0.224 0.248
W1 8.5 9.25 0.335 0.364
W2 0.50 0.20
H 18.50 18.70 0.728 0.726
H0 15.50 16.50 0.610 0.650
H1 25.00 0.984
D0 3.8 4.2 0.150 0.165
t 0.90 0.035
L1 3 0.118
delta P ±1 0.039
u 50 1.968
Φ1 360 14.173
Φ2 30 1.181
Tape & Reel for TO-92 MECHANICAL DATA
Φ1
Φ2
u
Pull-out direction
W
W1
W0
W2
A1
d
D0
H1
H
H0
L
l1
F1 F2
P2 P0
delta P
delta H
T2 T1
T
t
DRAWING NOT IN SCALE
LM217L/LM317L
12/13
Table 5: Revision History
Date Revisio n D escrip tion of Change s
16-Mar-2005 2 Add Tape & Reel for TO-92.
23-Dec-2005 3 Mistake on Ordering Table in Header.
LM217L/LM317L
13/13
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