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LM317L 100 mA Adjustable Output, Positive Voltage Regulator
The LM317L is an adjustable 3-terminal positive voltage regulator capable of supplying in excess of 100 mA 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 them essentially blow-out proof. The LM317L 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 LM317L can be used as a precision current regulator.
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LOW CURRENT THREE-TERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR
* * * * * * * * *
Pb-Free Packages are Available Output Current in Excess of 100 mA Output Adjustable Between 1.2 V and 37 V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Output Transistor Safe-Area Compensation Floating Operation for High Voltage Applications Standard 3-Lead Transistor Package Eliminates Stocking Many Fixed Voltages
SOIC-8 D SUFFIX CASE 751
8 1
Pin 1. 2. 3. 4. 5. 6. 7. 8.
Vin Vout Vout Adjust N.C. Vout Vout N.C.
TO-92 Z SUFFIX CASE 29
Pin 1. Adjust 2. Vout 3. Vin
1 2 3
Simplified Application
Vin Vout
LM317L
ORDERING INFORMATION
R1 240
See detailed ordering and shipping information in the package dimensions section on page 4 of this data sheet.
IAdj Cin* 0.1mF Adjust
+ C ** O 1.0mF
R2
* 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 Vout + 1.25 V 1 ) 2 ) IAdj R2 R1 Since IAdj is controlled to less than 100 mA, the error associated with this term is negligible in most applications.
(c) Semiconductor Components Industries, LLC, 2005
1
October, 2005 - Rev. 8
Publication Order Number: LM317L/D
LM317L
MAXIMUM RATINGS
Rating Input-Output Voltage Differential Power Dissipation Case 29 (TO-92) TA = 25C Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case 751 (SOIC-8) (Note 1) 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 RqJA RqJC
Internally Limited 160 83
W C/W C/W
PD RqJA RqJC TJ Tstg
Internally Limited 180 45 -40 to +125 -65 to +150
W C/W C/W C C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. 1. SOIC-8 Junction-to-Ambient Thermal Resistance is for minimum recommended pad size. Refer to Figure 23 for Thermal Resistance variation versus pad size. 2. This device series contains ESD protection and exceeds the following tests: Human Body Model, 2000 V per MIL STD 883, Method 3015. Machine Model Method, 200 V.
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LM317L
ELECTRICAL CHARACTERISTICS (VI-VO = 5.0 V; IO = 40 mA; TJ = Tlow to Thigh (Note 1); Imax and Pmax (Note 2);
unless otherwise noted.) LM317L, LB Characteristics Line Regulation (Note 3) TA = 25C, 3.0 V VI - VO 40 V Load Regulation (Note 3), TA = 25C 10 mA IO Imax - LM317L VO 5.0 V VO 5.0 V Adjustment Pin Current Adjustment Pin Current Change 2.5 V VI - VO 40 V, PD Pmax 10 mA IO Imax - LM317L Reference Voltage 3.0 V VI - VO 40 V, PD Pmax 10 mA IO Imax - LM317L Line Regulation (Note 3), 3.0 V VI - VO 40 V Load Regulation (Note 3) 10 mA IO Imax - LM317L 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 6.25 V, PD Pmax, Z Package VI - VO 40 V, PD Pmax, TA = 25C, Z Package RMS Noise, % of VO TA = 25C, 10 Hz f 10 kHz Ripple Rejection (Note 4) VO = 1.2 V, f = 120 Hz CAdj = 10 mF, VO = 10.0 V Long Term Stability, TJ = Thigh (Note 5) TA = 25C for Endpoint Measurements 3. 4. 5. 4 Figure 1 2 Symbol Regline Regload - - 3 1, 2 IAdj DIAdj - - 5.0 0.1 50 0.2 25 0.5 100 5.0 mV % VO mA mA Min - Typ 0.01 Max 0.04 Unit %/V
3
Vref
1.20
1.25
1.30
V
1 2
Regline Regload
-
0.02
0.07
%/V
- - 3 3 3 TS ILmin Imax 100 - N RR 60 - 3 S - - - -
20 0.3 0.7 3.5 200 20 0.00 3 80 80 0.3
70 1.5 - 10 - - -
mV % VO % VO mA mA
% VO dB
- - 1.0 %/1.0 k Hrs.
Tlow to Thigh = 0 to +125C for LM317L -40 to +125C for LM317LB Imax = 100 mA Pmax = 625 mW 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. 6. CAdj, when used, is connected between the adjustment pin and ground. 7. 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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LM317L
ORDERING INFORMATION
Device LM317LBD LM317LBDG LM317LBDR2 LM317LBDR2G LM317LBZ LM317LBZG LM317LBZRA LM317LBZRAG LM317LBZRP LM317LBZRPG LM317LD LM317LDG LM317LDR2 LM317LDR2G LM317LZ LM317LZG LM317LZRA LM317LZRAG LM317LZRE LM317LZRM LM317LZRP LM317LZRPG TJ = 0C to +125C TJ = -40C to +125C Operating Temperature Range Package SOIC-8 SOIC-8 (Pb-Free) SOIC-8 SOIC-8 (Pb-Free) TO-92 TO-92 (Pb-Free) TO-92 TO-92 (Pb-Free) TO-92 TO-92 (Pb-Free) SOIC-8 SOIC-8 (Pb-Free) SOIC-8 SOIC-8 (Pb-Free) TO-92 TO-92 (Pb-Free) TO-92 TO-92 (Pb-Free) TO-92 TO-92 TO-92 TO-92 (Pb-Free) Shipping 98 Units / Rail 98 Units / Rail 2500/Tape & Reel 2500/Tape & Reel 2000 Units / Bag 2000 Units / Bag 2000 Tape & Reel 2000 Tape & Reel 2000 Ammo Pack 2000 Ammo Pack 98 Units / Rail 98 Units / Rail 2500/Tape & Reel 2500/Tape & Reel 2000 Units / Bag 2000 Units / Bag 2000 Tape & Reel 2000 Tape & Reel 2000 Tape & Reel 2000 Ammo Pack 2000 Ammo Pack 2000 Ammo Pack
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.
Representative Schematic Diagram
Vin 300 300 300 3.0k 300 70 6.8V 6.8V
350
18k
8.67k 130 5.1k 200k
500 400
6.3V
180 180
2.0k
6.0k
10 p 10 Fp F
60
2.5
Vout 2.4k 12.8k 50
Adjust
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LM317L
VCC Line Regulation (%/V) = * VIH VIL Vin LM317L Vout VOH - VOL VOL x 100 VOH VOL
Adjust Cin 0.1mF IAdj
R1
240 1% CO
RL + 1mF
* Pulse Testing Required: 1% Duty Cycle is suggested.
R2 1 %
Figure 1. Line Regulation and DIAdj/Line Test Circuit
Load Regulation (mV) = VO (min Load) -VO (max Load) VO (min Load) - VO (max Load) Load Regulation (% VO) = VO (min Load) Vin* Vin LM317L Vout IL
X 100
VO (min Load) VO (max Load)
Adjust Cin 0.1mF IAdj
R1
240 1% + CO 1.0mF
RL (max Load) *
RL (min Load)
* Pulse Testing Required: 1% Duty Cycle is suggested.
R2 1%
Figure 2. Load Regulation and DIAdj/Load Test Circuit
Vin
LM317L
Vout
IL
Adjust R1 IAdj VI Cin 0.1mF ISET Pulse Testing Required: 1% Duty Cycle is suggested. R2 1%
240 1%
Vref + CO 1mF
RL VO
To Calculate R2: Vout = ISET R2 + 1.250 V Assume ISET = 5.25 mA
Figure 3. Standard Test Circuit
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LM317L
14.30V 4.30V f = 120 Hz Vin LM317L Vout Vout = 1.25 V
Adjust Cin 0.1mF
R1
240 1%
D1 * 1N4002 + CO 1mF
RL VO
R2
1.65K 1%
+ ** 10mF
* D1 Discharges CAdj if Output is Shorted to Ground.
**CAdj provides an AC ground to the adjust pin.
Figure 4. Ripple Rejection Test Circuit
V out, OUTPUT VOLTAGE CHANGE (%)
0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 -50 -25
RR, RIPPLE REJECTION (dB)
Vin = 45 V Vout = 5.0 V IL = 5.0 mA to 40 mA
80
70 IL = 40 mA f = 120 Hz Vout = 10 V Vin = 14 V to 24 V
Vin = 10 V Vout = 5.0 V IL = 5.0 mA to 100 mA
60
50 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150 -50 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150
Figure 5. Load Regulation
Figure 6. Ripple Rejection
0.50 TJ = 25C IO, OUTPUT CURRENT (A) 0.40 0.30 0.20 0.10 0 TJ = 150C V in -Vout , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V)
2.5
2.0 IL = 100 mA 1.5 IL = 5.0 mA 1.0
0
10 20 30 40 Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V)
50
0.5
-50
-25
0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C)
150
Figure 7. Current Limit
Figure 8. Dropout Voltage
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LM317L
5.0 IB , QUIESCENT CURRENT (mA) 4.5 RR, RIPPLE REJECTION (dB) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 10 20 30 40 Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V) TJ = 55C TJ = 25C TJ = 150C 100 90 80 70 60 50 40 30 20 10 10 100 1.0 k 10 k 100 k 1.0 M f, FREQUENCY (Hz) IL = 40 mA Vin = 5.0 V 1.0 VPP Vout = 1.25 V
Figure 9. Minimum Operating Current
Figure 10. Ripple Rejection versus Frequency
1.260 IAdj, ADJUSTMENT PIN CURRENT ( A) V ref , REFERENCE VOLTAGE (V)
80 70 65 60 55 50 45 40 35 -50 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150 Vin = 6.25 V Vout = Vref IL = 10 mA IL = 100 mA
1.250
1.240 Vin = 4.2 V Vout = Vref IL = 5.0 mA
1.230
1.220
-50
-25
0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C)
150
Figure 11. Temperature Stability
Figure 12. Adjustment Pin Current
Vout , OUTPUT VOLTAGE CHANGE (%)
0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 -50
NOISE VOLTAGE ( V)
Vin = 4.25 V to 41.25 V Vout = Vref IL = 5 mA
10
Bandwidth 100 Hz to 10 kHz
8.0
6.0
4.0 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150 -50 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150
Figure 13. Line Regulation
Figure 14. Output Noise
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LM317L
Vout , OUTPUT VOLTAGE DEVIATION (V) Vout , OUTPUT VOLTAGE DEVIATION (V)
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
0.3 0.2 0.1 0 -0.1 -0.2 -0.3 100 50 0 0 10 20 t, TIME (ms) IL 30 40 CL = 0.3 mF; CAdj = 10 mF Vin = 15 V Vout = 10 V INL = 50 mA TJ = 25C CL = 1 mF; CAdj = 10 mF
V in , INPUT VOTLAGE CHANGE (V)
Figure 15. Line Transient Response
I L , LOAD CURRENT (mA)
CL = 0; Without CAdj
Figure 16. Load Transient Response
APPLICATIONS INFORMATION
Basic Circuit Operation Load Regulation
The LM317L is a 3-terminal floating regulator. In operation, the LM317L 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 13), and this constant current flows through R2 to ground. The regulated output voltage is given by:
Vout = Vref (1 + R2 ) + IAdj R2 R1
The LM317L 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.
External Capacitors
Since the current from the adjustment terminal (IAdj) represents an error term in the equation, the LM317L 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 LM317L 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 LM317L Vout + R1 Adjust Vref IPROG Vout IAdj R2
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 LM317L 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.
Vref = 1.25 V Typical
Figure 17. Basic Circuit Configuration
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LM317L
Protection Diodes
D1 1N4002 Vin LM317L R1 Adjust R2 CAdj Vout + Cin D2 CO
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 14 shows the LM317L with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values (CO > 10 mF, CAdj > 5.0 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.
1N4002
Figure 18. Voltage Regulator with Protection Diodes
+25V Vin Adjust * To provide current limiting of IO to the system ground, the source of the current limiting diode must be tied to a negative voltage below - 7.25 V. Vref R2 IDSS R1 = Vref IOmax + IDSS Vout R1 1.25k D1 1N914 D2 1N914 VO IO D1 1N4002 Vin LM317L Vout + 1.0mF MPS2222 720 VSS* 1.0k TTL Control
LM317L
R2 500
120 Adjust
1N5314
Minimum Vout = 1.25 V
VO < POV + 1.25 V + VSS ILmin - IP < IO < 100 mA - IP As shown O < IO < 95 mA
D1 protects the device during an input short circuit.
Figure 19. Adjustable Current Limiter
Figure 20. 5.0 V Electronic Shutdown Regulator
Vin
LM317L
R1 Vout IAdj
R2
Iout
Vin
LM317L
Vout 240 1N4002 50k MPS2907 + 10mF
Adjust
Adjust R2
Ioutmax =
Vref R1 Vref R1 + R2
+ IAdj ^
1.25 V R1 1.25 V R1 + R2
Ioutmax =
+ IAdj ^
5.0 mA < Iout < 100 mA
Figure 21. Slow Turn-On Regulator
Figure 22. Current Regulator
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LM317L
PD, MAXIMUM POWER DISSIPATION (W) 170 R JA, THERMAL RESISTANCE JUNCTION-TO-AIR ( C/W) 150 130 110 90 70 50 30 0 10 RJA 20 Graph represents symmetrical layout L 2.0 oz. Copper L PD(max) for TA = 50C 3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4 30 40 50
L, LENGTH OF COPPER (mm)
Figure 23. SOP-8 Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length
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I III I I I I II I I I I I II I I I I III
3.0 mm
LM317L
PACKAGE DIMENSIONS
TO-92 Z SUFFIX CASE 29-11 ISSUE AL
A R P L
SEATING PLANE
B
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. CONTOUR OF PACKAGE BEYOND DIMENSION R IS UNCONTROLLED. 4. LEAD DIMENSION IS UNCONTROLLED IN P AND BEYOND DIMENSION K MINIMUM. INCHES MIN MAX 0.175 0.205 0.170 0.210 0.125 0.165 0.016 0.021 0.045 0.055 0.095 0.105 0.015 0.020 0.500 --- 0.250 --- 0.080 0.105 --- 0.100 0.115 --- 0.135 --- MILLIMETERS MIN MAX 4.45 5.20 4.32 5.33 3.18 4.19 0.407 0.533 1.15 1.39 2.42 2.66 0.39 0.50 12.70 --- 6.35 --- 2.04 2.66 --- 2.54 2.93 --- 3.43 ---
K
XX G H V
1
D J C SECTION X-X N N
DIM A B C D G H J K L N P R V
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LM317L
PACKAGE DIMENSIONS
SOIC-8 D SUFFIX CASE 751-07 ISSUE AG
-X- A
8 5 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 6. 751-01 THRU 751-06 ARE OBSOLETE. NEW STANDARD IS 751-07. MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.33 0.51 1.27 BSC 0.10 0.25 0.19 0.25 0.40 1.27 0_ 8_ 0.25 0.50 5.80 6.20 INCHES MIN MAX 0.189 0.197 0.150 0.157 0.053 0.069 0.013 0.020 0.050 BSC 0.004 0.010 0.007 0.010 0.016 0.050 0_ 8_ 0.010 0.020 0.228 0.244
B
1 4
S
0.25 (0.010)
M
Y
M
-Y- G C -Z- H D 0.25 (0.010)
M SEATING PLANE
K
N
X 45 _
0.10 (0.004)
M
J
ZY
S
X
S
DIM A B C D G H J K M N S
SOLDERING FOOTPRINT*
1.52 0.060 7.0 0.275 4.0 0.155
0.6 0.024
1.270 0.050
SCALE 6:1 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.
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.
PUBLICATION ORDERING INFORMATION
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LM317L/D

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