February 2008 Rev 7 1/21
21
LM217M
LM317M
Medium current 1.2 to 37 V adjustable voltage regulator
Features
■Output voltage range: 1.2 to 37 V
■Output current in excess of 500 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 LM217M/LM317M are monolithic integrated
circuits in TO-220 and DPAK packages intended
for use as positive adjustable voltage regulators.
They are designed to supply until 500 mA of load
current with an output voltage adjustable over a
1.2 to 37 V 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.
DPAK
TO-220
Table 1. Device summary
Order codes
TO-220 DPAK (tape and reel)
LM217MDT-TR
LM317MT LM317MDT-TR
www.st.com
Contents LM217M - LM317M
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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
6.1 External capacitors (Figure 8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.2 Protection diodes (Figure 8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.3 Start-up block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
LM217M - LM317M Diagram
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1 Diagram
Figure 1. Schematic diagram
Pin configuration LM217M - LM317M
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2 Pin configuration
Figure 2. Pin connections (top view)
DPAK
TO-220
LM217M - LM317M Maximum ratings
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3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
VI-VOInput-output differential voltage 40 V
PDPower dissipation Internally limited mW
TOP Operating junction temperature range (1)
1. Re-Boot is not guaranteed for TJ ≥ 85°C.
for LM217M -40 to 125 °C
for LM317M 0 to 125
TSTG Storage temperature range -55 to 150 °C
Table 3. Thermal data
Symbol Parameter TO-220 DPAK Unit
RthJC Thermal resistance junction-case 3 8 °C/W
RthJA Thermal resistance junction-ambient 50 100 °C/W
Figure 3. Test circuit
Electrical characteristics LM217M - LM317M
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4 Electrical characteristics
Table 4. Electrical characteristics of LM217M (refer to the test circuits, TJ = - 40 to 125 °C,
VI - VO = 5 V, IO = 100 mA, PD ≤ 7.5 W, unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
ΔVOLine regulation VI - VO = 3 to 40 V TJ = 25°C 0.01 0.02 %/V
0.02 0.05
ΔVOLoad regulation
VO ≤ 5 V
IO = 10 to 500mA
TJ = 25°C 5 15 mV
20 50
VO ≥ 5 V
IO = 10 to 500mA
TJ = 25°C 0.1 0.3 %/VO
0.3 1
IADJ Adjustment pin current 50 100 µA
ΔIADJ Adjustment pin current VI - VO = 3 to 40 V, IO = 10 to 500 mA 0.2 5 µA
VREF Reference voltage VI - VO = 3 to 40 V, IO = 10 to 500 mA 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 ≤ 15 V 500 1000 mA
VI - VO = 40 V, Pd < PDMAX, TJ = 25°C 200
eN Output noise voltage
(percentage of VO)B = 10 Hz to 100 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
LM217M - LM317M Electrical characteristics
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Table 5. Electrical characteristics of LM317M (refer to the test circuits, TJ = 0 to 125 °C,
VI - VO = 5 V, IO = 100 mA, PD ≤ 7.5 W, unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
ΔVOLine regulation VI - VO = 3 to 40 V TJ = 25°C 0.01 0.04 %/V
0.02 0.07
ΔVOLoad regulation
VO ≤ 5 V
IO = 10 to 500mA
TJ = 25°C 5 25 mV
20 70
VO ≥ 5 V
IO = 10 to 500mA
TJ = 25°C 0.1 0.5 %/VO
0.3 1.5
IADJ Adjustment pin current 50 100 µA
ΔIADJ Adjustment pin current VI - VO = 3 to 40 V, IO = 10 to 500 mA 0.2 5 µA
VREF Reference voltage VI - VO = 3 to 40 V, IO = 10 to 500 mA 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 10 mA
IO(max) Maximum output current VI - VO ≤ 15 V 500 1000 mA
VI - VO = 40 V, Pd < PDMAX, TJ = 25°C 200
eN Output noise voltage
(percentage of VO)B = 10 Hz to 100 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 LM217M - LM317M
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5 Typical performance
Note: Pdmax calculated for Ta = 50°C.
Figure 4. Current limit Figure 5. Minimum operating current
Figure 6. Basic adjustable regulator
Figure 7. Thermal resistance & maximum power dissipation vs P.C.B. copper length for DPAK
LM217M - LM317M Application information
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6 Application information
The LM217M/LM317M provide an internal reference voltage of 1.25 V between the output
and adjustment terminals. These devices are used to set a constant current flow across an
external resistor divider (see Figure 6), giving an output voltage VO of: VO = VREF (1 + R2 /
R1) + IADJ R2.
The devices were designed to minimize the term IADJ (100 µA max) and to maintain it very
constant in 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 LM217M/LM317M devices are floating regulators and "see" 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 regulators are easily obtained and, by connecting a fixed resistor between
the adjustment and output, the devices can be used as a precision current regulator. In
order to optimize the load regulation, the current set resistor R1 (see Figure 6) 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.
6.1 External capacitors (Figure 8)
Normally no capacitors are needed unless the devices are situated far from the input filter
capacitors; in which case an input bypass is needed.
A 0.1 µF disc or 1 µF tantalum input bypass capacitor (CI) is recommended to reduce the
sensitivity to input line impedance.
The adjustment terminal may be bypassed to ground to improve ripple rejection. This
capacitor (CADJ) prevents ripple from being amplified as the output voltage is increased. A
10 µF capacitor should improve ripple rejection of about 80 dB at 120 Hz in a 10 V
application.
Although the LM217M/LM317M devices are stable with no output capacitance like any
feedback circuit, certain values of external capacitance can cause excessive ringing. An
output capacitance (CO) in the form of a 1 µF tantalum or 25 µF aluminium electrolytic
capacitor on the output swamps this effect and insures stability.
6.2 Protection diodes (Figure 8)
When external capacitors are used with any IC regulator it is sometimes necessary to add
protection diodes to prevent the capacitors from discharging through low current points into
the regulator.
Figure 6 shows the LM217M/LM317M with the recommended protection diodes for output
voltages in excess of 25 V or high capacitance values (C3 > 25 µF, C2 > 10 µF). Diode D1
prevents C3 from discharging through the IC during an input short-circuit. The combination
of diodes D1 and D2 prevents C2 from discharging through the regulator during an input or
output short-circuit.
6.3 Start-up block
It’s not guaranteed the Re-Boot of the device when the junction temperature is over 85 °C.
Application circuits LM217M - LM317M
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7 Application circuits
Figure 8. Voltage regulator with protection diodes
Figure 9. Slow turn-on 15 V regulator
Figure 10. Current regulator
IO=VREF/R1 + IADJ = 1.25V/R1
LM217M - LM317M Application circuits
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Figure 11. 5 V electronic shut-down regulator
Figure 12. Digitally selected outputs
(R2 = sets maximum VO)
Package mechanical data LM217M - LM317M
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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.
LM217M - LM317M Package mechanical data
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Dim. mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 4.40 4.60 0.1730.181
C1.231.32 0.0480.051
D 2.40 2.72 0.094 0.107
D1 1.27 0.050
E0.490.70 0.0190.027
F 0.61 0.88 0.024 0.034
F1 1.14 1.70 0.044 0.067
F2 1.14 1.70 0.044 0.067
G4.95 5.15 0.194 0.203
G1 2.4 2.7 0.094 0.106
H2 10.0 10.40 0.393 0.409
L2 16.4 0.645
L4 13.0 14.0 0.511 0.551
L5 2.65 2.95 0.104 0.116
L6 15.25 15.75 0.600 0.620
L7 6.2 6.6 0.244 0.260
L93.5 3.93 0.137 0.154
DIA. 3.75 3.85 0.147 0.151
TO-220 mechanical data
P011C
Package mechanical data LM217M - LM317M
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Figure 13. Drawing dimension DPAK (type STD-ST)
0068772/G
LM217M - LM317M Package mechanical data
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Figure 14. Drawing dimension DPAK (type FUJITSU-Subcon.)
0068772/G
Package mechanical data LM217M - LM317M
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Figure 15. Drawing dimension DPAK (type IDS-Subcon.)
0068772/G
LM217M - LM317M Package mechanical data
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Note: The DPAK package coming from the two subcontractors (Fujitsu and IDS) are fully
compatible with the ST's package suggested footprint.
Table 6. DPAK mechanical data
Dim.
type STD-ST type FUJITSU-Subcon. type IDS-Subcon
mm. mm. mm.
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
A 2.20 2.40 2.25 2.30 2.35 2.19 2.38
A1 0.90 1.10 0.96 1.06 0.89 1.14
A2 0.03 0.23 0 0.10 0.03 0.23
b 0.64 0.90 0.76 0.86 0.64 0.88
b4 5.20 5.40 5.28 5.38 5.21 5.46
c 0.45 0.60 0.46 0.56 0.46 0.58
c2 0.48 0.60 0.46 0.56 0.46 0.58
D 6.00 6.20 6.05 6.15 5.97 6.22
D1 5.10 5.27 5.47 5.20
E 6.40 6.60 6.55 6.60 6.65 6.35 6.73
E1 4.70 4.77 4.70
e 2.28 2.23 2.28 2.33 2.28
e1 4.40 4.60 4.51 4.61
H 9.35 10.10 9.90 10.30 9.40 10.42
L 1.00 1.40 1.60 0.90
L1 2.80 2.50 2.65
L2 0.80 1.03 1.13 0.89 1.27
L4 0.60 1.00 0.70 0.90 0.64 1.02
R 0.20 0.40 0.20
V2 0° 8° 0° 8° 0° 8°
Package mechanical data LM217M - LM317M
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Figure 16. DPAK footprint recommended data
Table 7. Footprint data
Values
Dim. mm. inch.
A6.700.264
B 6.70 0.64
C 1.8 0.070
D 3.0 0.118
E1.600.063
F2.300.091
G2.300.091
LM217M - LM317M Package mechanical data
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Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A330 12.992
C12.813.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N60 2.362
T22.40.882
Ao 6.806.90 7.00 0.2680.272 0.2.76
Bo 10.40 10.50 10.60 0.4090.4130.417
Ko 2.55 2.65 2.75 0.100 0.104 0.105
Po 3.94.0 4.1 0.1530.157 0.161
P7.98.0 8.1 0.311 0.315 0.319
Tape & reel DPAK-PPAK mechanical data
LM217M - LM317M
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