May 2007 Rev. 4 1/18
18
LM217L
LM317L
Low current 1.2 to 37V adjustable voltage regulator
Features
■Output voltage range: 1.2 to 37V
■Output current in excess of 100 mA
■Line regulation typ. 0.01%
■Load regulation typ. 0.1%
■Thermal overload protection
■Short circuit protection
■Output transition safe area 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
stocking of many fixed regulators.
SO-8
TO-92
www.st.com
Order codes
Part numbers
Packages
SO-8 (Tape & reel) TO-92 (BAG) (1)
1. Available in tape & reel with the suffix "-TR" and in Ammopak with the suffix "-AP". Please note that in these cases pins are
shaped according to tape & reel specifications
LM217L LM217LD13TR LM217LZ
LM317L LM317LD13TR LM317LZ
LM217L/LM317L
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Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
LM217L/LM317L Diagram
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1 Diagram
Figure 1. Schematic diagram
Pin configuration LM217L/LM317L
4/18
2 Pin configuration
Figure 2. Pin connections (top view for SO-8, bottom view for TO-92)
TO-92
SO-8
PIN 1 = ADJUST
PIN 2 = IN
PIN 3 = OUT
LM217L/LM317L Maximum ratings
5/18
3 Maximum ratings
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
VI-VOInput-output differential voltage 40 V
PDPower dissipation Internally Limited mW
TOP Operating junction temperature range for LM217L -40 to 125 °C
for LM317L 0 to 125
TSTG Storage temperature range -55 to 150 °C
Figure 3. Test circuit
Electrical characteristics LM217L/LM317L
6/18
4 Electrical characteristics
Table 2. Electrical characteristics of LM217L (refer to the test circuits, TJ = - 40 to 125°C,
VI - VO = 5 V, IO = 40 mA, unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
ΔVOLine regulation VI - VO = 3 to 40 V
IL < 20 mA
TJ = 25°C 0.01 0.02 %/V
0.02 0.05
ΔVOLoad 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
ΔIADJ 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 1.2 1.25 1.3 V
ΔVO/VO
Output 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 KHz, TJ = 25°C 0.003 %
SVR Supply voltage rejection (1)
1. CADJ is connected between adjust pin and ground.
TJ = 25°C
f = 120 Hz
CADJ = 0 65 dB
CADJ = 10 µF 66 80
LM217L/LM317L Electrical characteristics
7/18
Table 3. Electrical characteristics of LM317L (refer to the test circuits, TJ = 0 to 125°C,
VI - VO = 5 V, IO = 40 mA, unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
ΔVOLine regulation VI - VO = 3 to 40 V
IL < 20 mA
TJ = 25°C 0.01 0.04 %/V
0.02 0.07
ΔVOLoad 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
ΔIADJ 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 1.2 1.25 1.3 V
ΔVO/VO
Output 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 KHz, TJ = 25°C 0.003 %
SVR Supply voltage rejection (1) TJ = 25°C
f = 120 Hz
CADJ = 0 65 dB
CADJ = 10 µF 66 80
1. CADJ is connected between adjust pin and ground.
Typical performance LM217L/LM317L
8/18
5 Typical performance
Figure 4. Current limit Figure 5. Minimum operating current
LM217L/LM317L Application information
9/18
6 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 Figure 4.), giving an output voltage VO of:
VO = VREF (1 + R2/R1) + IADJ R2
The device was designed to minimize the term IADJ (100µA max) and to maintain it very
constant with line and load changes. Usually, the error term IADJ × R2 can be neglected. To
obtain the previous requirement, all the regulator 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-to-output differential
voltage, supplies of very high voltage with respect to ground can be regulated as long as the
maximum 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 Figure 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 sensing.
Application circuits LM217L/LM317L
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7 Application circuits
Figure 6. Basic adjustable regulator
Figure 7. Voltage regulator with protection diodes
Figure 8. Slow Turn-on 15V Regulator
LM217L/LM317L Application circuits
11/18
Figure 9. Current regulator
IO=VREF/R1 + IADJ = 1.25V/R1
Figure 10. 5V Electronic shut-down regulator
Figure 11. Digitally selected outputs
(R2 = sets maximum VO)
Package mechanical data LM217L/LM317L
12/18
8 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
LM217L/LM317L Package mechanical data
13/18
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
Package mechanical data LM217L/LM317L
14/18
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 Package mechanical data
15/18
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
Package mechanical data LM217L/LM317L
16/18
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 Revision history
17/18
9 Revision history
Table 4. Revision history
Date Revision Changes
16-Mar-2005 2 Add Tape & reel for TO-92.
23-Dec-2005 3 Mistake on ordering table in header.
18-May-2007 4 Order codes has been updated and the document has been reformatted.
LM217L/LM317L
18/18
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