LM117/217

LM317

1.2V TO 37V VOLTAGE REGULATOR

■ OUTPUT VOLTAGE RANGE: 1.2 TO 37V

■ OUTPUT CURRENT IN EXCESS OF 1.5A
■ 0.1% LINE AND LOAD REGULATION
■ FLOATING OPERATION FOR HIGH
VOLTAGES
■ COMPLETE SERIES OF PROTECTIONS:
CURRENT LIMITING, THERMAL
SHUTDOWN AND SOA CONTROL

DESCRIPTION TO-220 TO-220FP

The LM117/LM217/LM317 are monolithic
integrated circuit in TO-220, TO-220FP, TO-3 and
D2PAK packages intended for use as positive
adjustable voltage regulators.
They are designed to supply more than 1.5A 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 D2PAK TO-3
stocking of many fixed regulators.

SCHEMATIC DIAGRAM

September 2003 1/14

This datasheet has been downloaded from http://www.digchip.com at this page

LM117/217/317

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter² Value Unit

VI-O Input-output Differential Voltage 40 V
IO Output Current Internally Limited
Operating Junction Temperature for: LM117 -55 to 150
Top LM217 -25 to 150 °C
LM317 0 to 125
Ptot Power Dissipation Internally Limited
Tstg Storage Temperature -65 to 150 °C

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.

THERMAL DATA

Symbol Parameter D2PAK TO-220 TO-220FP TO-3 Unit

Rthj-case Thermal Resistance Junction-case Max 3 3 5 4 °C/W
Rthj-amb Thermal Resistance Junction-ambient Max 62.5 50 60 35 °C/W

CONNECTION DIAGRAM (top view)

TO-220 TO-220FP

D2PAK TO-3

ORDERING CODES

TYPE TO-220 D2PAK TO-220FP TO-3

LM117 LM117K
LM217 LM217T LM217D2T LM217K
LM317 LM317T LM317D2T LM317P LM317K

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 LM117/217/317

BASIC ADJUSTABLE REGULATOR

ELECTRICAL CHARACTERISTICS FOR LM117/LM217 (VI - VO = 5 V, IO = 500 mA, IMAX = 1.5 A and
PMAX = 20 W, TJ = -55 to 150°C for LM117, TJ = -25 to 150°C for LM217, unless otherwise specified).
Symbol Parameter Test Conditions Min. Typ. Max. Unit
∆VO Line Regulation VI - VO = 3 to 40 V TJ = 25°C 0.01 0.02 %/V
0.02 0.05
∆VO Load Regulation VO ≤ 5 V TJ = 25°C 5 15 mV
IO = 10 mA to IMAX 20 50
VO ≥ 5 V TJ = 25°C 0.1 0.3 %
IO = 10 mA to IMAX 0.3 1
IADJ Adjustment Pin Current 50 100 µA
∆IADJ Adjustment Pin Current VI - VO = 2.5 to 40 V IO = 10 mA to IMAX 0.2 5 µA
VREF Reference Voltage VI - VO = 2.5 to 40 V IO = 10 mA to IMAX 1.2 1.25 1.3 V
(between pin 3 and pin 1) PD ≤ PMAX
∆VO/VO Output Voltage 1 %
Temperature Stability
IO(min) Minimum Load Current VI - VO = 40 V 3.5 5 mA
IO(max) Maximum Load Current VI - VO ≤ 15 V PD < PMAX 1.5 2.2 A
VI - VO = 40 V PD < PMAX TJ = 25°C 0.4
eN Output Noise Voltage B = 10Hz to 100KHz TJ = 25°C 0.003 %
(percentage of VO)
SVR Supply Voltage Rejection (*) TJ = 25°C f = 120Hz CADJ=0 65 dB
CADJ=10µF 66 80
(*) CADJ is connected between pin 1 and ground.

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LM117/217/317

ELECTRICAL CHARACTERISTICS FOR LM317 (VI - VO = 5 V, IO = 500 mA, IMAX = 1.5 A and
PMAX = 20 W, TJ = 0 to 125°C, unless otherwise specified).
Symbol Parameter Test Conditions Min. Typ. Max. Unit
∆VO Line Regulation VI - VO = 3 to 40 V TJ = 25°C 0.01 0.04 %/V
0.02 0.07
∆VO Load Regulation VO ≤ 5 V TJ = 25°C 5 25 mV
IO = 10 mA to IMAX 20 70
VO ≥ 5 V TJ = 25°C 0.1 0.5 %
IO = 10 mA to IMAX 0.3 1.5
IADJ Adjustment Pin Current 50 100 µA
∆IADJ Adjustment Pin Current VI - VO = 2.5 to 40 V IO = 10 mA to IMAX 0.2 5 µA
VREF Reference Voltage VI - VO = 2.5 to 40 V IO = 10 mA to IMAX 1.2 1.25 1.3 V
(between pin 3 and pin 1) PD ≤ PMAX
∆VO/VO Output Voltage 1 %
Temperature Stability
IO(min) Minimum Load Current VI - VO = 40 V 3.5 10 mA
IO(max) Maximum Load Current VI - VO ≤ 15 V PD < PMAX 1.5 2.2 A
VI - VO = 40 V PD < PMAX TJ = 25°C 0.4
eN Output Noise Voltage B = 10Hz to 100KHz TJ = 25°C 0.003 %
(percentage of VO)
SVR Supply Voltage Rejection (*) TJ = 25°C f = 120Hz CADJ=0 65 dB
CADJ=10µF 66 80
(*) CADJ is connected between pin 1 and ground.

Figure 1 : Output Current vs Input-output Figure 2 : Dropout Voltage vs Junction

Differential Voltage Temperature

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 LM117/217/317

Figure 3 : Reference Voltage vs Junction

Figure 4 : Basic Adjustable Regulator

APPLICATION INFORMATION
The LM117/217/317 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 (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 LM117/217317 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 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
sensing. Performance may be improved with added capacitance as follow:
An input bypass capacitor of 0.1µF
An adjustment terminal to ground 10µF capacitor to improve the ripple rejection of about 15 dB (CADJ).
An 1µF tantalum (or 25µFAluminium electrolytic) capacitor on the output to improve transient response. In
additional to external capacitors, it is good practice to add protection diodes, as shown in fig.5. D1 protect
the device against input short circuit, while D2 protect against output short circuit for capacitance
discharging.

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LM117/217/317

Table 5 : Voltage Regulator with Protection Diodes

D1 protect the device against input short circuit, while D2 protects against output short circuit for capacitors discharging.

Figure 6 : Slow Turn-on 15V Regulator

Figure 7 : Current Regulator

Vref 1.25V
IO =  + IADJ ≈ 
R1 R1

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 LM117/217/317

Figure 8 : 5V Electronic Shut-down Regulator

Figure 9 : Digitally Selected Outputs

(R2 sets maximum VO)

Figure 10 : Battery Charger (12V)

* RS sets output impedance of charger ZO = RS (1 + R2/R1). Use of RS allows low charging rates whit fully charged battery.

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LM117/217/317

Figure 11 : Current Limited 6V Charger

* R3 sets peak current (0.6A for 1 0).

** C1 recommended to filter out input transients

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 LM117/217/317

TO-3 MECHANICAL DATA

mm. inch
DIM.
MIN. TYP MAX. MIN. TYP. MAX.

A 11.85 0.466

B 0.96 1.05 1.10 0.037 0.041 0.043

C 1.70 0.066

D 8.7 0.342

E 20.0 0.787

G 10.9 0.429

N 16.9 0.665

P 26.2 1.031

R 3.88 4.09 0.152 0.161

U 39.5 1.555

V 30.10 1.185

A D
P

G C
E
U

B
O
N

P003C/C

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LM117/217/317

TO-220 MECHANICAL DATA

mm. inch
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 4.40 4.60 0.173 0.181
C 1.23 1.32 0.048 0.051
D 2.40 2.72 0.094 0.107
D1 1.27 0.050
E 0.49 0.70 0.019 0.027
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
G 4.95 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
L9 3.5 3.93 0.137 0.154
DIA. 3.75 3.85 0.147 0.151

P011C

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 LM117/217/317

TO-220FP MECHANICAL DATA

mm. inch
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 4.40 4.60 0.173 0.181
B 2.5 2.7 0.098 0.106
D 2.5 2.75 0.098 0.108
E 0.45 0.70 0.017 0.027
F 0.75 1 0.030 0.039
F1 1.15 1.50 0.045 0.059
F2 1.15 1.50 0.045 0.059
G 4.95 5.2 0.194 0.204
G1 2.4 2.7 0.094 0.106
H 10.0 10.40 0.393 0.409
L2 16 0.630
L3 28.6 30.6 1.126 1.204
L4 9.8 10.6 0.385 0.417
L6 15.9 16.4 0.626 0.645
L7 9 9.3 0.354 0.366
DIA. 3 3.2 0.118 0.126

E
A

D
B

L3
L6
L7
F1

¯
G1

G
H

F2

1 2 3
L2 L4
7012510/G

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LM117/217/317

D2PAK MECHANICAL DATA

mm. inch
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 4.4 4.6 0.173 0.181
A1 2.49 2.69 0.098 0.106
A2 0.03 0.23 0.001 0.009
B 0.7 0.93 0.027 0.036
B2 1.14 1.7 0.044 0.067
C 0.45 0.6 0.017 0.023
C2 1.23 1.36 0.048 0.053
D 8.95 9.35 0.352 0.368
D1 8 0.315
E 10 10.4 0.393 0.409
E1 8.5 0.335
G 4.88 5.28 0.192 0.208
L 15 15.85 0.590 0.624
L2 1.27 1.4 0.050 0.055
L3 1.4 1.75 0.055 0.068
M 2.4 3.2 0.094 0.126
R 0.4 0.016
V2 0˚ 8˚ 0˚ 8˚

P011P6G

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 LM117/217/317

Tape & Reel D2PAK-P 2PAK-D 2PAK/A-P 2PAK/A MECHANICAL DATA

mm. inch
DIM.
MIN. TYP MAX. MIN. TYP. MAX.

A 180 7.086

C 12.8 13.0 13.2 0.504 0.512 0.519

D 20.2 0.795

N 60 2.362

T 14.4 0.567

Ao 10.50 10.6 10.70 0.413 0.417 0.421

Bo 15.70 15.80 15.90 0.618 0.622 0.626

Ko 4.80 4.90 5.00 0.189 0.193 0.197

Po 3.9 4.0 4.1 0.153 0.157 0.161

P 11.9 12.0 12.1 0.468 0.472 0.476

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LM117/217/317

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