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LM317, NCV317 1.5 A Adjustable Output, Positive Voltage Regulator
The LM317 is an adjustable 3-terminal positive voltage regulator capable of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow-out proof. The LM317 serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM317 can be used as a precision current regulator.
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2 3
D2PAK-3 D2T SUFFIX CASE 936
* * * * * * * * *
Output Current in Excess of 1.5 A Output Adjustable between 1.2 V and 37 V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Constant with Temperature Output Transistor Safe-Area Compensation Floating Operation for High Voltage Applications Available in Surface Mount D2PAK-3, and Standard 3-Lead Transistor Package Eliminates Stocking many Fixed Voltages Pb-Free Packages are Available
Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2.
TO-220 T SUFFIX CASE 221AB
1 2 3
Pin 1. Adjust 2. Vout 3. Vin
Heatsink surface connected to Pin 2. Vin LM317 Vout R1 240 Adjust + C ** O 1.0 mF
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet.
IAdj Cin* 0.1 mF
R2
DEVICE MARKING INFORMATION
See general marking information in the device marking section on page 10 of this data sheet.
** Cin is required if regulator is located an appreciable distance from power supply filter. ** CO is not needed for stability, however, it does improve transient response. R V out + 1.25 V 1 ) 2 R1 )I R Adj 2
Since IAdj is controlled to less than 100 mA, the error associated with this term is negligible in most applications.
Figure 1. Standard Application
(c) Semiconductor Components Industries, LLC, 2006
1
August, 2006 - Rev. 9
Publication Order Number: LM317/D
LM317, NCV317
MAXIMUM RATINGS
Rating Input-Output Voltage Differential Power Dissipation Case 221A TA = +25C Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case 936 (D2PAK-3) TA = +25C Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Operating Junction Temperature Range Storage Temperature Range Symbol VI-VO Value 40 Unit Vdc
PD qJA qJC PD qJA qJC TJ Tstg
Internally Limited 65 5.0 Internally Limited 70 5.0 -55 to +150 -65 to +150
W C/W C/W W C/W C/W C C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
ELECTRICAL CHARACTERISTICS (VI-VO = 5.0 V; IO = 0.5 A for D2T and T packages; TJ = Tlow to Thigh (Note 1); Imax and Pmax
(Note 2); unless otherwise noted.) Characteristics Line Regulation (Note 3), TA = +25C, 3.0 V VI-VO 40 V Load Regulation (Note 3), TA = +25C, 10 mA IO Imax VO 5.0 V VO 5.0 V Thermal Regulation, TA = +25C (Note 4), 20 ms Pulse Adjustment Pin Current Adjustment Pin Current Change, 2.5 V VI-VO 40 V, 10 mA IL Imax, PD Pmax Reference Voltage, 3.0 V VI-VO 40 V, 10 mA IO Imax, PD Pmax Line Regulation (Note 3), 3.0 V VI-VO 40 V Load Regulation (Note 3), 10 mA IO Imax VO 5.0 V VO 5.0 V Temperature Stability (Tlow TJ Thigh) Minimum Load Current to Maintain Regulation (VI-VO = 40 V) Maximum Output Current VI-VO 15 V, PD Pmax, T Package VI-VO = 40 V, PD Pmax, TA = +25C, T Package RMS Noise, % of VO, TA = +25C, 10 Hz f 10 kHz Ripple Rejection, VO = 10 V, f = 120 Hz (Note 5) Without CAdj CAdj = 10 mF Long-Term Stability, TJ = Thigh (Note 6), TA = +25C for Endpoint Measurements Thermal Resistance Junction-to-Case, T Package 4 3 1, 2 3 1 2 Figure 1 2 Symbol Regline Regload - - Regtherm IAdj DIAdj Vref Regline Regload - - 3 3 3 TS ILmin Imax 1.5 0.15 N RR - 66 3 S RqJC - - 65 80 0.3 5.0 - - 1.0 - %/1.0 k Hrs. C/W - 2.2 0.4 0.003 - - - % VO dB - - 20 0.3 0.7 3.5 70 1.5 - 10 mV % VO % VO mA A - - - 1.2 - 5.0 0.1 0.03 50 0.2 1.25 0.02 25 0.5 0.07 100 5.0 1.3 0.07 mV % VO % VO/W mA mA V %V Min - Typ 0.01 Max 0.04 Unit %/V
1. Tlow to Thigh = 0 to +125C, for LM317T, D2T. Tlow to Thigh = - 40 to +125C, for LM317BT, BD2T, Tlow to Thigh = - 55 to +150C, for NCV317BT, BD2T. 2. Imax = 1.5 A, Pmax = 20 W 3. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 4. Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time. 5. CAdj, when used, is connected between the adjustment pin and ground. 6. Since Long-Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot.
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LM317, NCV317
Vin 310 310 230 120 5.6 k 6.3 V 170 6.7 k 125 k 12.4 k 135 6.8 k 510 6.3 V 12 k 5.0 pF 200 160 13 k
30pF 6.3 V 190 3.6 k 5.8 k 110 5.1 k
30pF
2.4 k
105 4.0
12.5 k 0.1
Vout Adjust This device contains 29 active transistors.
Figure 2. Representative Schematic Diagram
VCC * VIH VIL Vin * Pulse testing required. * 1% Duty Cycle * is suggested. LM317 Adjust Cin 0.1 mF IAdj R1 Line Regulation (% V) + Vout |V -V | OH OL x 100 |V | OL VOH VOL
240 1%
+ CO 1.0 mF RL
R2 1%
Figure 3. Line Regulation and DIAdj/Line Test Circuit
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LM317, NCV317
VI Vin LM317 Vout IL RL (max Load) * + Cin 0.1 mF IAdj CO 1.0 mF VO (min Load) VO (max Load) RL (min Load)
Adjust
R1
240 1%
R2 1%
* Pulse testing required. * 1% Duty Cycle is suggested.
Load Regulation (mV) = VO (min Load) - VO (max Load)
Load Regulation (% VO) =
VO (min Load) - VO (max Load) VO (min Load)
x 100
Figure 4. Load Regulation and DIAdj/Load Test Circuit
Vin
LM317
Vout
IL
Adjust VI Cin 0.1 mF ISET R2 1% R1 IAdj
240 1%
Vref + CO 1.0 mF
RL VO
* Pulse testing required. * 1% Duty Cycle is suggested.
To Calculate R2: Vout = ISET R2 + 1.250 V To Calculate R2: Assume ISET = 5.25 mA
Figure 5. Standard Test Circuit
24 V 14 V f = 120 Hz Vin LM317 Vout
Adjust Cin 0.1 mF
R1
240 1%
D1* 1N4002 + CO 1.0 mF
RL VO
Vout = 10 V
R2
1.65 k 1%
+ CAdj
10 mF
* D1 Discharges CAdj if output is shorted to Ground.
Figure 6. Ripple Rejection Test Circuit
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LM317, NCV317
4.0 Vout, OUTPUT VOLTAGE CHANGE (%) 0.4 I out , OUTPUT CURRENT (A) 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 -50 -25 0 25 50 75 100 TJ, JUNCTION TEMPERATURE (C) 125 150 0 0 10 20 30 Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) 40 Vin = 15 V Vout = 10 V IL = 1.5 A IL = 0.5 A 3.0 TJ = 25C 2.0 150C 1.0 -55C
Figure 7. Load Regulation
Figure 8. Current Limit
3.0 I Adj, ADJUSTMENT PIN CURRENT ( A) V in-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) 70 65 60 55 50 45 40 35 -50 -25 0 25 50 75 100 125 150 DVout = 100 mV 2.5 IL = 1.5 A
1.0 A 2.0 500 mA 1.5 200 mA 20 mA 1.0 -50 -25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (C)
TJ, JUNCTION TEMPERATURE (C)
Figure 9. Adjustment Pin Current
Figure 10. Dropout Voltage
1.26 Vref, REFERENCE VOLTAGE (V) IB, QUIESCENT CURRENT (mA)
5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 TJ = -55C +25C +150C
1.25
1.24
1.23
1.22
-50
-25
0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C)
150
0
10 20 30 40 Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
Figure 11. Temperature Stability
Figure 12. Minimum Operating Current
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LM317, NCV317
100 CAdj = 10 mF RR, RIPPLE REJECTION (dB) RR, RIPPLE REJECTION (dB) 80 60 40 20 0 0 5.0 10 15 20 25 30 35 Vout, OUTPUT VOLTAGE (V) Vin - Vout = 5 V IL = 500 mA f = 120 Hz TJ = 25C Without CAdj 120 100 80 60 40 20 Vin = 15 V Vout = 10 V f = 120 Hz TJ = 25C 0.1 1.0 10 CAdj = 10 mF Without CAdj
0 0.01
IO, OUTPUT CURRENT (A)
Figure 13. Ripple Rejection versus Output Voltage
Figure 14. Ripple Rejection versus Output Current
100 RR, RIPPLE REJECTION (dB) 80 60 40 20 0 10 100 1.0 k 10 k 100 k 1.0 M 10 M f, FREQUENCY (Hz) IL = 500 mA Vin = 15 V Vout = 10 V TJ = 25C Z O, OUTPUT IMPEDANCE ( )
101
100
Vin = 15 V Vout = 10 V IL = 500 mA TJ = 25C Without CAdj
10-1
10-2 CAdj = 10 mF 10-3 10 100 1.0 k 10 k 100 k 1.0 M f, FREQUENCY (Hz)
CAdj = 10 mF Without CAdj
Figure 15. Ripple Rejection versus Frequency
Figure 16. Output Impedance
Vout , OUTPUT VOLTAGE DEVIATION (V)
Vout , OUTPUT VOLTAGE DEVIATION (V)
3.0 2.0 1.0 0 -1.0 -2.0 -3.0 CL = 0; Without CAdj 1.5 1.0 0.5 0 0 10 20 t, TIME (ms) 30 40 IL Vin = 15 V Vout = 10 V INL = 50 mA TJ = 25C CL = 1.0 mF; CAdj = 10 mF
1.5 1.0 0.5 0 -0.5 -1.0 -1.5 1.0 0.5 0 0 10 20 t, TIME (ms) Vin 30 40 Vout = 10 V IL = 50 mA TJ = 25C CL = 1.0 mF; CAdj = 10 mF
V in , INPUT VOTLAGE CHANGE (V)
Figure 17. Line Transient Response
IL , LOAD CURRENT (A)
CL = 0; Without CAdj
Figure 18. Load Transient Response
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LM317, NCV317
APPLICATIONS INFORMATION
Basic Circuit Operation External Capacitors
The LM317 is a 3-terminal floating regulator. In operation, the LM317 develops and maintains a nominal 1.25 V reference (Vref) between its output and adjustment terminals. This reference voltage is converted to a programming current (IPROG) by R1 (see Figure 17), and this constant current flows through R2 to ground. The regulated output voltage is given by:
V out + V ref R 1) 2 R1 )I R Adj 2
Since the current from the adjustment terminal (IAdj) represents an error term in the equation, the LM317 was designed to control IAdj to less than 100 mA and keep it constant. To do this, all quiescent operating current is returned to the output terminal. This imposes the requirement for a minimum load current. If the load current is less than this minimum, the output voltage will rise. Since the LM317 is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltages with respect to ground is possible.
Vin LM317 Vout + R1 Adjust Vref IPROG
A 0.1 mF disc or 1.0 mF tantalum input bypass capacitor (Cin) 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 mF capacitor should improve ripple rejection about 15 dB at 120 Hz in a 10 V application. Although the LM317 is 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 1.0 mF tantalum or 25 mF aluminum electrolytic capacitor on the output swamps this effect and insures stability.
Protection Diodes
Vout
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 18 shows the LM317 with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values (CO > 25 mF, CAdj > 10 mF). Diode D1 prevents CO from discharging thru the IC during an input short circuit. Diode D2 protects against capacitor CAdj discharging through the IC during an output short circuit. The combination of diodes D1 and D2 prevents CAdj from discharging through the IC during an input short circuit.
D1
IAdj Vref = 1.25 V Typical
R2 Vout Vin
1N4002 Vout LM317 + Cin R1 Adjust R2 CAdj D2 CO
Figure 19. Basic Circuit Configuration
Load Regulation
The LM317 is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. For best performance, the programming resistor (R1) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby degrading regulation. The ground end of R2 can be returned near the load ground to provide remote ground sensing and improve load regulation.
1N4002
Figure 20. Voltage Regulator with Protection Diodes
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LM317, NCV317
PD(max) for TA = +50C 70 60 50 40 RqJA 30 0 5.0 10 15 20 L, LENGTH OF COPPER (mm) Free Air Mounted Vertically 3.0 2.0 oz. Copper L PD, MAXIMUM POWER DISSIPATION (W) 80 R JA, THERMAL RESISTANCE JUNCTION-TO-AIR (C/W) 3.5
2.5 2.0 1.5
Minimum Size Pad
L
Figure 21. D2PAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length
D6* 1N4002 Vin 32 V to 40 V LM317 (1) Vout1 RSC Vin2 LM317 (2) Vout 2 240 Adjust 1 Current Limit Adjust * Diodes D1 and D2 and transistor Q2 are added to * allow adjustment of output voltage to 0 V. * D6 protects both LM317's during an input short circuit. 1.0K D1 1N4001 D2 1N4001 5.0 k Adjust 2 Voltage Adjust 1N4001 Q1 2N3822 D3 D4 -10 V Q2 2N5640 IN4001 Output Range: 0 VO 25 V Output Range: 0 IO 1.5 A D5 IN4001 + 10 mF Iout Vout + 1.0 mF Tantalum
Vin1 0.1 mF
Figure 22. ``Laboratory'' Power Supply with Adjustable Current Limit and Output Voltage
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IIII IIII IIII IIII
25 -10 V
1.0 30
LM317, NCV317
+25 V Vin
Vout LM317
R1 1.25
D1* Iout Vin 1N4002 Vout LM317 120 Adjust MPS2222 720 2N5640 1.0 k TTL Control + 1.0 mF
Adjust
R2 100
D1 1N4001 D2 1N4001
* To provide current limiting of IO to the system * ground, the source of the FET must be tied to a * negative voltage below - 1.25 V. R1 = Vref IOmax + IDSS R2 Vref IDDS VSS*
Minimum Vout = 1.25 V * D1 protects the device during an input short circuit.
VO < BVDSS + 1.25 V + VSS, ILmin - IDSS < IO < 1.5 A. As shown 0 < IO < 1.0 A.
Figure 23. Adjustable Current Limiter
Figure 24. 5.0 V Electronic Shutdown Regulator
Vin
LM317
Vout 240 1N4001 50 k MPS2907 +
Vin LM317
Vout
R1
Iout
Adjust R2
Adjust I out +
IAdj ref ) I Adj R1 + 1.25 V R1 10 mA Iout 1.5 A V
10 mF
Figure 25. Slow Turn-On Regulator
Figure 26. Current Regulator
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LM317, NCV317
ORDERING INFORMATION
Device LM317BD2T LM317BD2TG LM317BD2TR4 LM317BD2TR4G LM317BT LM317BTG LM317D2T LM317D2TG LM317D2TR4 LM317D2TR4G LM317T LM317TG NCV317BD2T* NCV317BD2TG* NCV317BD2TR4* NCV317BD2TR4G* NCV317BT* NCV317BTG* TJ = -55 to +150C TJ = 0 to +125C TJ = -40 to +125C Operating Temperature Range Package D2PAK-3 D2PAK-3 (Pb-Free) D2PAK-3 D2PAK-3 (Pb-Free) TO-220 TO-220 (Pb-Free) D2PAK-3 D2PAK-3 (Pb-Free) D2PAK-3 D2PAK-3 (Pb-Free) TO-220 TO-220 (Pb-Free) D2PAK-3 D2PAK-3 (Pb-Free) D2PAK-3 D2PAK-3 (Pb-Free) TO-220 TO-220 (Pb-Free) 50 Units / Rail 50 Units / Rail 50 Units / Rail 800 Tape & Reel 800 Tape & Reel 50 Units / Rail 50 Units / Rail 50 Units / Rail 800 Tape & Reel 50 Units / Rail Shipping
50 Units / Rail 50 Units / Rail 800 Tape & Reel 800 Tape & Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *Devices are qualified for automotive use.
MARKING DIAGRAMS
D2PAK-3 D2T SUFFIX CASE 936
TO-220 T SUFFIX CASE 221A
LM 317BD2T AWLYWWG 2 1 3
LM 317D2T AWLYWWG 2 1 3
NC V317BD2T AWLYWWG 2 1 3
LM 317BT AWLYWWG
LM 317T AWLYWWG
NC V317BT AWLYWWG
123 A WL Y WW G = Assembly Location = Wafer Lot = Year = Work Week = Pb-Free Package
123
123
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LM317, NCV317
PACKAGE DIMENSIONS
D2PAK-3 D2T SUFFIX PLASTIC PACKAGE CASE 936-03 ISSUE B
-T- K A
OPTIONAL CHAMFER
TERMINAL 4
E
U V
S B F
1 2 3
H M L P
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. TAB CONTOUR OPTIONAL WITHIN DIMENSIONS A AND K. 4. DIMENSIONS U AND V ESTABLISH A MINIMUM MOUNTING SURFACE FOR TERMINAL 4. 5. DIMENSIONS A AND B DO NOT INCLUDE MOLD FLASH OR GATE PROTRUSIONS. MOLD FLASH AND GATE PROTRUSIONS NOT TO EXCEED 0.025 (0.635) MAXIMUM. DIM A B C D E F G H J K L M N P R S U V INCHES MIN MAX 0.386 0.403 0.356 0.368 0.170 0.180 0.026 0.036 0.045 0.055 0.051 REF 0.100 BSC 0.539 0.579 0.125 MAX 0.050 REF 0.000 0.010 0.088 0.102 0.018 0.026 0.058 0.078 5 _ REF 0.116 REF 0.200 MIN 0.250 MIN MILLIMETERS MIN MAX 9.804 10.236 9.042 9.347 4.318 4.572 0.660 0.914 1.143 1.397 1.295 REF 2.540 BSC 13.691 14.707 3.175 MAX 1.270 REF 0.000 0.254 2.235 2.591 0.457 0.660 1.473 1.981 5 _ REF 2.946 REF 5.080 MIN 6.350 MIN
J D 0.010 (0.254) M T
N G R
C
SOLDERING FOOTPRINT*
8.38 0.33
10.66 0.42
1.016 0.04
5.08 0.20
3.05 0.12 17.02 0.67
SCALE 3:1 mm inches
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
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LM317, NCV317
PACKAGE DIMENSIONS
TO-220, SINGLE GAUGE T SUFFIX PLASTIC PACKAGE CASE 221AB-01 ISSUE O
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION Z DEFINES A ZONE WHERE ALL BODY AND LEAD IRREGULARITIES ARE ALLOWED. DIM A B C D F G H J K L N Q R S T U V Z INCHES MIN MAX 0.570 0.620 0.380 0.405 0.160 0.190 0.025 0.035 0.142 0.147 0.095 0.105 0.110 0.155 0.018 0.025 0.500 0.562 0.045 0.060 0.190 0.210 0.100 0.120 0.080 0.110 0.020 0.055 0.235 0.255 0.000 0.050 0.045 --- --- 0.080 MILLIMETERS MIN MAX 14.48 15.75 9.66 10.28 4.07 4.82 0.64 0.88 3.61 3.73 2.42 2.66 2.80 3.93 0.46 0.64 12.70 14.27 1.15 1.52 4.83 5.33 2.54 3.04 2.04 2.79 0.508 1.39 5.97 6.47 0.00 1.27 1.15 --- --- 2.04
-T- B
4
SEATING PLANE
F T S
C
Q
123
A U K
H Z L V G D N R J
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
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LM317/D

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