R1
240 W
R2
2.4 kW
INPUT OUTPUT
ADJUST
LM317
VI
RS
0.2 W
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM317
SLVS044X –SEPTEMBER 1997–REVISED SEPTEMBER 2016
LM317 3-Terminal Adjustable Regulator
1
1 Features
1• Output Voltage Range Adjustable
From 1.25 V to 37 V
• Output Current Greater Than 1.5 A
• Internal Short-Circuit Current Limiting
• Thermal Overload Protection
• Output Safe-Area Compensation
2 Applications
• ATCA Solutions
• DLP: 3D Biometrics, Hyperspectral Imaging,
Optical Networking, and Spectroscopy
• DVR and DVS
• Desktop PC
• Digital Signage and Still Camera
• ECG Electrocardiogram
• EV HEV Charger: Level 1, 2, and 3
• Electronic Shelf Label
• Energy Harvesting
• Ethernet Switch
• Femto Base Station
• Fingerprint and Iris Biometrics
• HVAC: Heating, Ventilating, and Air Conditioning
• High-Speed Data Acquisition and Generation
• Hydraulic Valve
• IP Phone: Wired and Wireless
• Intelligent Occupancy Sensing
• Motor Control: Brushed DC, Brushless DC, Low-
Voltage, Permanent Magnet, and Stepper Motor
• Point-to-Point Microwave Backhaul
• Power Bank Solutions
• Power Line Communication Modem
• Power Over Ethernet (PoE)
• Power Quality Meter
• Power Substation Control
• Private Branch Exchange (PBX)
• Programmable Logic Controller
• RFID Reader
• Refrigerator
• Signal or Waveform Generator
• Software Defined Radio (SDR)
• Washing Machine: High-End and Low-End
• X-ray: Baggage Scanner, Medical, and Dental
3 Description
The LM317 device is an adjustable three-terminal
positive-voltage regulator capable of supplying more
than 1.5 A over an output-voltage range of 1.25 V to
37 V. It requires only two external resistors to set the
output voltage. The device features a typical line
regulation of 0.01% and typical load regulation of
0.1%. It includes current limiting, thermal overload
protection, and safe operating area protection.
Overload protection remains functional even if the
ADJUST terminal is disconnected.
Device Information(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
LM317DCY SOT-223 (4) 6.50 mm × 3.50 mm
LM317KCS TO-220 (3) 10.16 mm × 9.15 mm
LM317KCT TO-220 (3) 10.16 mm × 8.59 mm
LM317KTT TO-263 (3) 10.16 mm × 9.01 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Battery-Charger Circuit
2
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Table of Contents
1 Features.................................................................. 1
2 Applications ........................................................... 1
3 Description............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information.................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics.............................................. 6
7 Detailed Description.............................................. 8
7.1 Overview................................................................... 8
7.2 Functional Block Diagram......................................... 8
7.3 Feature Description................................................... 8
7.4 Device Functional Modes.......................................... 9
8 Application and Implementation ........................ 10
8.1 Application Information............................................ 10
8.2 Typical Application.................................................. 10
8.3 System Examples ................................................... 11
9 Power Supply Recommendations...................... 18
10 Layout................................................................... 18
10.1 Layout Guidelines ................................................. 18
10.2 Layout Example .................................................... 18
11 Device and Documentation Support................. 19
11.1 Receiving Notification of Documentation Updates 19
11.2 Community Resources.......................................... 19
11.3 Trademarks........................................................... 19
11.4 Electrostatic Discharge Caution............................ 19
11.5 Glossary................................................................ 19
12 Mechanical, Packaging, and Orderable
Information........................................................... 19
4 Revision History
Changes from Revision W (January 2015) to Revision X Page
• Changed body size dimensions for KCS TO-220 Package on Device information table ...................................................... 1
• Changed body size dimensions for KTT TO-263 Package on Device information table ...................................................... 1
• Changed VOOutput Voltage max value from 7 to 37 on Recommended Operating Conditions table.................................. 4
• Added min value to IOOutput Current in Recommended Operating Conditions table .......................................................... 4
• Changed values in the Thermal Information table to align with JEDEC standards ............................................................... 4
• Added KCT package data to Thermal Information table ....................................................................................................... 4
• Deleted Section 9.3.6 "Adjusting Multiple On-Card Regulators with a Single Control" ....................................................... 13
• Updated Adjustsable 4-A Regulator Circuit graphic ............................................................................................................ 16
• Added Receiving Notification of Documentation Updates section and Community Resources section.............................. 19
Changes from Revision V (February 2013) to Revision W Page
• Added Applications,Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table,
Feature Description section, Device Functional Modes,Application and Implementation section, Power Supply
Recommendations section, Layout section, Device and Documentation Support section, and Mechanical,
Packaging, and Orderable Information section. ..................................................................................................................... 1
• Deleted Ordering Information table. ....................................................................................................................................... 1
1 ADJUST
2 OUTPUT
3 INPUT
Not to scale
OUTPUT
1ADJUST
2OUTPUT
3INPUT
4 OUTPUT
Not to scale
1 ADJUST
2 OUTPUT
3 INPUT
Not to scale
OUTPUT
3
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5 Pin Configuration and Functions
DCY Package
3-Pin SOT-223
Top View
KCS or KCT Package
3-Pin TO-220
Top View
KTT Package
3-Pin TO-263
Top View
Pin Functions
PIN I/O DESCRIPTION
NAME TO-263,
TO-220 SOT-223
ADJUST 1 1 I Output voltage adjustment pin. Connect to a resistor divider to set VO
INPUT 3 3 I Supply input pin
OUTPUT 2 2, 4 O Voltage output pin
4
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(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
6 Specifications
6.1 Absolute Maximum Ratings
over virtual junction temperature range (unless otherwise noted)(1)
MIN MAX UNIT
VI– VOInput-to-output differential voltage 40 V
TJOperating virtual junction temperature 150 °C
Lead temperature 1,6 mm (1/16 in) from case for 10 s 260 °C
Tstg Storage temperature –65 150 °C
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.2 ESD Ratings MAX UNIT
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) 2500 V
Charged device model (CDM), per JEDEC specification JESD22-C101(2) 1000
6.3 Recommended Operating Conditions MIN MAX UNIT
VOOutput voltage 1.25 37 V
VI– VOInput-to-output differential voltage 3 40 V
IOOutput current 0.01 1.5 A
TJOperating virtual junction temperature 0 125 °C
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.4 Thermal Information
THERMAL METRIC(1)
LM317
UNIT
DCY
(SOT-223) KCS
(TO-220) KCT
(TO-220) KTT
(TO-263)
4 PINS 3 PINS 3 PINS 3 PINS
Rθ(JA) Junction-to-ambient thermal resistance 66.8 23.5 37.9 38.0 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 43.2 15.9 51.1 36.5 °C/W
RθJB Junction-to-board thermal resistance 16.9 7.9 23.2 18.9 °C/W
ψJT Junction-to-top characterization parameter 3.6 3.0 13.0 6.9 °C/W
ψJB Junction-to-board characterization parameter 16.8 7.8 22.8 17.9 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance NA 0.1 4.2 1.1 °C/W
5
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(1) Unless otherwise noted, the following test conditions apply: |VI– VO| = 5 V and IOMAX = 1.5 A, TJ= 0°C to 125°C. Pulse testing
techniques are used to maintain the junction temperature as close to the ambient temperature as possible.
(2) Line regulation is expressed here as the percentage change in output voltage per 1-V change at the input.
(3) CADJ is connected between the ADJUST terminal and GND.
(4) Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD= (TJ(max) – TA) / θJA. Operating at the absolute maximum TJof 150°C can affect reliability.
6.5 Electrical Characteristics
over recommended ranges of operating virtual junction temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS(1) MIN TYP MAX UNIT
Line regulation(2) VI– VO= 3 V to 40 V TJ= 25°C 0.01 0.04 %/V
TJ= 0°C to 125°C 0.02 0.07
Load regulation IO= 10 mA to 1500 mA
CADJ(3) = 10 μF,
TJ= 25°C VO≤5 V 25 mV
VO≥5 V 0.1 0.5 %VO
TJ= 0°C to 125°C VO≤5 V 20 70 mV
VO≥5 V 0.3 1.5 %VO
Thermal regulation 20-ms pulse, TJ= 25°C 0.03 0.07 %VO/W
ADJUST terminal current 50 100 μA
Change in
ADJUST terminal current VI– VO= 2.5 V to 40 V, PD≤20 W, IO= 10 mA to 1500 mA 0.2 5 μA
Reference voltage VI– VO= 3 V to 40 V, PD≤20 W, IO= 10 mA to 1500 mA 1.2 1.25 1.3 V
Output-voltage
temperature stability TJ= 0°C to 125°C 0.7 %VO
Minimum load current
to maintain regulation VI– VO= 40 V 3.5 10 mA
Maximum output current VI– VO≤15 V, PD< PMAX(4) 1.5 2.2 A
VI– VO≤40 V, PD< PMAX(4), TJ= 25°C 0.15 0.4
RMS output noise voltage
(% of VO)f = 10 Hz to 10 kHz, TJ= 25°C 0.003 %VO
Ripple rejection VO= 10 V, f = 120 Hz CADJ = 0 μF(3) 57 dB
CADJ = 10 μF(3) 62 64
Long-term stability TJ= 25°C 0.3 1 %/1k hr
T =125°C
A
T =25°C
A
T = –40°C
A
VIN = 15 V
VOUT = 10 V
f = 120 Hz
TA= 25°C
-5
-4.5
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
-30
-20
-10
0
10
20
30
40
50
60
70
Tim e – µs
Load Current – A
9
9.2
9.4
9.6
9.8
10
10.2
10.4
10.6
10.8
11
VIN
VOUT
C =10µF
ADJ
-5
-4.5
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
-30
-20
-10
0
10
20
30
40
50
60
70
Tim e – µs
Load Current – A
9
9.2
9.4
9.6
9.8
10
10.2
10.4
10.6
10.8
11
VOUT Deviation – V
VIN
VOUT
C =0µF
ADJ
9.98
9.985
9.99
9.995
10
10.005
10.01
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5
IOUT – A
VOUT – V
T =25°C
A
T = –40°C
A
T =125°C
A
V =10VNom
OUT
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
IOUT – A
VOUT – V
T =125°C
A
T =25°C
A
T = –40°C
A
V =V
OUT REF
6
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6.6 Typical Characteristics
Figure 1. Load Regulation Figure 2. Load Regulation
Figure 3. Load Transient Response Figure 4. Load Transient Response
Figure 5. Line Regulation Figure 6. Ripple Rejection
vs Output Current
-75
-70
-65
-60
-55
-50
-45
-40
-35
5 10 15 20 25 30 35
VOUT – V
Ripple Rejection – dB
VIN – VOUT = 15 V
IOUT = 500 mA
f = 120 Hz
TA= 25°C
-90
-80
-70
-60
-50
-40
-30
-20
-10
100 1000 10000 100000 1000000
Frequency – Hz
Ripple Rejection – dB
VIN = 15 V
VOUT = 10 V
IOUT = 500 mA
TA= 25°C
100 1k 10k 100k 1M
C =0µF
ADJ
C =10µF
ADJ
7
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Typical Characteristics (continued)
Figure 7. Ripple Rejection
vs Output Voltage Figure 8. Ripple Rejection
vs Frequency
+
Over Temp &
Over Current
Protection
Input
Adj.
Output
1.25 V
Iadj
8
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7 Detailed Description
7.1 Overview
The LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying up to 1.5 A
over an output-voltage range of 1.25 V to 37 V. It requires only two external resistors to set the output voltage.
The device features a typical line regulation of 0.01% and typical load regulation of 0.1%. It includes current
limiting, thermal overload protection, and safe operating area protection. Overload protection remains functional
even if the ADJUST terminal is disconnected.
The LM317 device is versatile in its applications, including uses in programmable output regulation and local on-
card regulation. Or, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, the LM317
device can function as a precision current regulator. An optional output capacitor can be added to improve
transient response. The ADJUST terminal can be bypassed to achieve very high ripple-rejection ratios, which are
difficult to achieve with standard three-terminal regulators.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 NPN Darlington Output Drive
NPN Darlington output topology provides naturally low output impedance and an output capacitor is optional. 3-V
headroom is recommended (VI– VO) to support maximum current and lowest temperature.
7.3.2 Overload Block
Over-current and over-temperature shutdown protects the device against overload or damage from operating in
excessive heat.
7.3.3 Programmable Feedback
Op amp with 1.25-V offset input at the ADJUST terminal provides easy output voltage or current (not both)
programming. For current regulation applications, a single resistor whose resistance value is 1.25 V/IOand power
rating is greater than (1.25 V)2/R should be used. For voltage regulation applications, two resistors set the output
voltage.
9
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7.4 Device Functional Modes
7.4.1 Normal Operation
The device OUTPUT pin will source current necessary to make OUTPUT pin 1.25 V greater than ADJUST
terminal to provide output regulation.
7.4.2 Operation With Low Input Voltage
The device requires up to 3-V headroom (VI– VO) to operate in regulation. The device may drop out and
OUTPUT voltage will be INPUT voltage minus drop out voltage with less headroom.
7.4.3 Operation at Light Loads
The device passes its bias current to the OUTPUT pin. The load or feedback must consume this minimum
current for regulation or the output may be too high. See the Electrical Characteristics table for the minimum load
current needed to maintain regulation.
7.4.4 Operation In Self Protection
When an overload occurs the device shuts down Darlington NPN output stage or reduces the output current to
prevent device damage. The device will automatically reset from the overload. The output may be reduced or
alternate between on and off until the overload is removed.
LM317
R1
240 W
IAdj
R2
Adjust
Ci
0.1 µF
CO
1.0 µF
VIVO
OutputInput
Vref = 1.25 V
D1
1N4002
D2
1N4002
CADJ
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10
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The flexibility of the LM317 allows it to be configured to take on many different functions in DC power
applications.
8.2 Typical Application
Figure 9. Adjustable Voltage Regulator
8.2.1 Design Requirements
• R1 and R2 are required to set the output voltage.
• CADJ is recommended to improve ripple rejection. It prevents amplification of the ripple as the output voltage
is adjusted higher.
• Ciis recommended, particularly if the regulator is not in close proximity to the power-supply filter capacitors. A
0.1-µF or 1-µF ceramic or tantalum capacitor provides sufficient bypassing for most applications, especially
when adjustment and output capacitors are used.
• COimproves transient response, but is not needed for stability.
• Protection diode D2 is recommended if CADJ is used. The diode provides a low-impedance discharge path to
prevent the capacitor from discharging into the output of the regulator.
• Protection diode D1 is recommended if COis used. The diode provides a low-impedance discharge path to
prevent the capacitor from discharging into the output of the regulator.
8.2.2 Detailed Design Procedure
VOis calculated as shown in Equation 1. IADJ is typically 50 µA and negligible in most applications.
VO= VREF (1 + R2 / R1) + (IADJ × R2) (1)
C1
0.1 µF
R1
120 W
R2
3 kW
INPUT OUTPUT
ADJUST
LM317
VO
+35 V
R3
680
W
−10 V
2 3
OUT REF
1
R R
V V 1 10 V
R
æ ö
+
= + -
ç ÷
è ø
14
15
16
17
18
19
20
-25
-15
-5
5
15
25
35
45
55
65
Tim e – µs
VIN Change – V
9.98
10.00
10.02
10.04
10.06
10.08
10.10
10.12
VOUT – V
VOUT
VIN
C =10µF
ADJ
14
15
16
17
18
19
20
-25
-15
-5
5
15
25
35
45
55
65
Tim e – µs
VIN Change – V
9.98
10.00
10.02
10.04
10.06
10.08
10.10
VOUT – V
VOUT
VIN
C =0µF
ADJ
11
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Typical Application (continued)
8.2.3 Application Curves
Figure 10. Line-Transient Response Figure 11. Line-Transient Response
8.3 System Examples
8.3.1 0-V to 30-V Regulator Circuit
Here, the voltage is determined by
Figure 12. 0-V to 30-V Regulator Circuit
C1
0.1 µFC2
1µF
R1
240 Ω
INPUT OUTPUT
ADJUST
LM317
VI
INPUT OUTPUT
ADJUST
VO
LM317
R2
720 Ω
R3
120 Ω
R4
1 kΩ
Output
Adjust
ADJUST
OUTPUTINPUT
VI
R1
LM317
Ilimit
1.2
R1
C1
0.1 µF
C3
1µF
R1
240 W
INPUT OUTPUT
ADJUST
LM317
VO
VI
D1
1N4002
R2
5 kW
C2
10 µF
12
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System Examples (continued)
8.3.2 Adjustable Regulator Circuit With Improved Ripple Rejection
C2 helps to stabilize the voltage at the adjustment pin, which helps reject noise. Diode D1 exists to discharge C2
in case the output is shorted to ground.
Figure 13. Adjustable Regulator Circuit with Improved Ripple Rejection
8.3.3 Precision Current-Limiter Circuit
This application limits the output current to the ILIMIT in the diagram.
Figure 14. Precision Current-Limiter Circuit
8.3.4 Tracking Preregulator Circuit
This application keeps a constant voltage across the second LM317 in the circuit.
Figure 15. Tracking Preregulator Circuit
R1
240 W
R2
2.4 kW
INPUT OUTPUT
ADJUST
LM317
VI
RS
0.2 W
Copyright © 2016, Texas Instruments Incorporated
æ ö
= ´ ç ÷
+
è ø
R2
Output impendance RS R1 1
=OUT 1.25V
I (short) RS
æ ö
= ´ ç ÷
+
è ø
OUT
R2
V 1.25V
R1 1
R1
1.2 kΩ
R2
20 kΩ
INPUT OUTPUT
ADJUST
LM317
VO
VI
( )
+ = o reg(min)R1 R2 min V I
2 3
OUT REF
1
R R
V V 1 10 V
R
æ ö
+
= + -
ç ÷
è ø
13
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System Examples (continued)
8.3.5 1.25-V to 20-V Regulator Circuit With Minimum Program Current
Because the value of VREF is constant, the value of R1 determines the amount of current that flows through R1
and R2. The size of R2 determines the IR drop from ADJUSTMENT to GND. Higher values of R2 translate to
higher VOUT.
(2)
(3)
Figure 16. 1.25-V to 20-V Regulator Circuit With Minimum Program Current
8.3.6 Battery-Charger Circuit
The series resistor limits the current output of the LM317, minimizing damage to the battery cell.
(4)
(5)
(6)
Figure 17. Battery-Charger Circuit
480 Ω
120 Ω
INPUT OUTPUT
ADJUST
LM317
VI
120 Ω
480 Ω
INPUT OUTPUT
ADJUST
LM317
VI
12 VI(PP) 6 VO(PP)
2 W (TYP)
R1
240 Ω
INPUT OUTPUT
ADJUST
LM317
VO= 15 V
VI
D1
1N4002
R2
2.7 kΩ
C1
25 µF
R3
50 kΩ
2N2905
INPUT OUTPUT
ADJUST
LM317
VI
24 Ω
14
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System Examples (continued)
8.3.7 50-mA Constant-Current Battery-Charger Circuit
The current limit operation mode can be used to trickle charge a battery at a fixed current. ICHG = 1.25 V ÷ 24 Ω.
VIshould be greater than VBAT + 4.25 V. (1.25 V [VREF] + 3 V [headroom])
Figure 18. 50-mA Constant-Current Battery-Charger Circuit
8.3.8 Slow Turn-On 15-V Regulator Circuit
The capacitor C1, in combination with the PNP transistor, helps the circuit to slowly start supplying voltage. In the
beginning, the capacitor is not charged. Therefore output voltage starts at VC1+ VBE +1.25V=0V+0.65V+
1.25 V = 1.9 V. As the capacitor voltage rises, VOUT rises at the same rate. When the output voltage reaches the
value determined by R1 and R2, the PNP will be turned off.
Figure 19. Slow Turn-On 15-V Regulator Circuit
8.3.9 AC Voltage-Regulator Circuit
These two LM317s can regulate both the positive and negative swings of a sinusoidal AC input.
Figure 20. AC Voltage-Regulator Circuit
R1
240 W
R2
1.1 kW
INPUT OUTPUT
ADJUST
LM317
VI+
R3
VI−
15
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System Examples (continued)
8.3.10 Current-Limited 6-V Charger Circuit
As the charge current increases, the voltage at the bottom resistor increases until the NPN starts sinking current
from the adjustment pin. The voltage at the adjustment pin drops, and consequently the output voltage
decreases until the NPN stops conducting.
Figure 21. Current-Limited 6-V Charger Circuit
8.3.11 Adjustable 4-A Regulator Circuit
This application keeps the output current at 4 A while having the ability to adjust the output voltage using the
adjustable (1.5 kΩin schematic) resistor.
INPUT OUTPUT
ADJUST
LM317
VI
2N2905
INPUT OUTPUT
ADJUST
LM317
INPUT OUTPUT
ADJUST
LM317
TL084
0.2 Ω
0.2 Ω
0.2 Ω
100 Ω 5 k Ω
5 k Ω
150 Ω
1.5 k Ω
200 pF
4.5 V to 25 V
_
+
Copyright © 2016, Texas Instruments Incorporated
16
LM317
SLVS044X –SEPTEMBER 1997–REVISED SEPTEMBER 2016
www.ti.com
Product Folder Links: LM317
Submit Documentation Feedback Copyright © 1997–2016, Texas Instruments Incorporated
System Examples (continued)
Figure 22. Adjustable 4-A Regulator Circuit
INPUT OUTPUT
ADJUST
LM317
2N2905
22 W
VI5 kW
500 W
120 W1N4002
10 µF
47 µF
10 µF
TIP73
VO
17
LM317
www.ti.com
SLVS044X –SEPTEMBER 1997–REVISED SEPTEMBER 2016
Product Folder Links: LM317
Submit Documentation FeedbackCopyright © 1997–2016, Texas Instruments Incorporated
System Examples (continued)
8.3.12 High-Current Adjustable Regulator Circuit
The NPNs at the top of the schematic allow higher currents at VOUT than the LM317 can provide, while still
keeping the output voltage at levels determined by the adjustment pin resistor divider of the LM317.
Figure 23. High-Current Adjustable Regulator Circuit
R1
OUTPUT
INPUT
OUTPUT
ADJ/GND
R2
Cadj
COUT
0.1 Fμ 10 Fμ
Ground
Ground
High
Frequency
Bypass
Capacitor
High Input
Bypass
Capacitor
Power
18
LM317
SLVS044X –SEPTEMBER 1997–REVISED SEPTEMBER 2016
www.ti.com
Product Folder Links: LM317
Submit Documentation Feedback Copyright © 1997–2016, Texas Instruments Incorporated
9 Power Supply Recommendations
The LM317 is designed to operate from an input voltage supply range between 1.25 V to 37 V greater than the
output voltage. If the device is more than six inches from the input filter capacitors, an input bypass capacitor, 0.1
μF or greater, of any type is needed for stability.
10 Layout
10.1 Layout Guidelines
• TI recommends that the input terminal be bypassed to ground with a bypass capacitor.
• The optimum placement is closest to the input terminal of the device and the system GND. Take care to
minimize the loop area formed by the bypass-capacitor connection, the input terminal, and the system GND.
• For operation at full rated load, TI recommends to use wide trace lengths to eliminate I × R drop and heat
dissipation.
10.2 Layout Example
Figure 24. Layout Example
19
LM317
www.ti.com
SLVS044X –SEPTEMBER 1997–REVISED SEPTEMBER 2016
Product Folder Links: LM317
Submit Documentation FeedbackCopyright © 1997–2016, Texas Instruments Incorporated
11 Device and Documentation Support
11.1 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
11.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.4 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
11.5 Glossary
SLYZ022 —TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
PACKAGE OPTION ADDENDUM
www.ti.com 17-Mar-2017
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM317DCY ACTIVE SOT-223 DCY 4 80 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR 0 to 125 L3
LM317DCYG3 ACTIVE SOT-223 DCY 4 80 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR 0 to 125 L3
LM317DCYR ACTIVE SOT-223 DCY 4 2500 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR 0 to 125 L3
LM317DCYRG3 ACTIVE SOT-223 DCY 4 2500 Green (RoHS
& no Sb/Br) CU SN Level-2-260C-1 YEAR 0 to 125 L3
LM317KCS ACTIVE TO-220 KCS 3 50 Pb-Free
(RoHS) CU SN N / A for Pkg Type 0 to 125 LM317
LM317KCSE3 ACTIVE TO-220 KCS 3 50 Pb-Free
(RoHS) CU SN N / A for Pkg Type 0 to 125 LM317
LM317KCT ACTIVE TO-220 KCT 3 50 Pb-Free
(RoHS) CU SN N / A for Pkg Type 0 to 125 LM317
LM317KTTR ACTIVE DDPAK/
TO-263 KTT 3 500 Green (RoHS
& no Sb/Br) CU SN Level-3-245C-168 HR 0 to 125 LM317
LM317KTTRG3 ACTIVE DDPAK/
TO-263 KTT 3 500 Green (RoHS
& no Sb/Br) CU SN Level-3-245C-168 HR 0 to 125 LM317
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
PACKAGE OPTION ADDENDUM
www.ti.com 17-Mar-2017
Addendum-Page 2
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LM317DCYR SOT-223 DCY 4 2500 330.0 12.4 7.0 7.42 2.0 8.0 12.0 Q3
LM317DCYR SOT-223 DCY 4 2500 330.0 12.4 6.55 7.25 1.9 8.0 12.0 Q3
LM317DCYR SOT-223 DCY 4 2500 330.0 12.4 7.05 7.4 1.9 8.0 12.0 Q3
LM317KTTR DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.8 16.3 5.11 16.0 24.0 Q2
LM317KTTR DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.8 16.1 4.9 16.0 24.0 Q2
PACKAGE MATERIALS INFORMATION
www.ti.com 3-Aug-2017
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LM317DCYR SOT-223 DCY 4 2500 350.0 334.0 47.0
LM317DCYR SOT-223 DCY 4 2500 336.0 336.0 48.0
LM317DCYR SOT-223 DCY 4 2500 340.0 340.0 38.0
LM317KTTR DDPAK/TO-263 KTT 3 500 340.0 340.0 38.0
LM317KTTR DDPAK/TO-263 KTT 3 500 350.0 334.0 47.0
PACKAGE MATERIALS INFORMATION
www.ti.com 3-Aug-2017
Pack Materials-Page 2
MECHANICAL DATA
MPDS094A – APRIL 2001 – REVISED JUNE 2002
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DCY (R-PDSO-G4) PLASTIC SMALL-OUTLINE
4202506/B 06/2002
6,30 (0.248)
6,70 (0.264)
2,90 (0.114)
3,10 (0.122)
6,70 (0.264)
7,30 (0.287) 3,70 (0.146)
3,30 (0.130)
0,02 (0.0008)
0,10 (0.0040)
1,50 (0.059)
1,70 (0.067)
0,23 (0.009)
0,35 (0.014)
1 2 3
4
0,66 (0.026)
0,84 (0.033)
1,80 (0.071) MAX
Seating Plane
0°–10°
Gauge Plane
0,75 (0.030) MIN
0,25 (0.010)
0,08 (0.003)
0,10 (0.004) M
2,30 (0.091)
4,60 (0.181) M
0,10 (0.004)
NOTES: A. All linear dimensions are in millimeters (inches).
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion.
D. Falls within JEDEC TO-261 Variation AA.
www.ti.com
PACKAGE OUTLINE
9.25
9.05
6.5
6.1
2.9
2.6
10.36
9.96
13.12
12.70
3X
3.9 MAX
3X 1.36
1.23
3X 0.90
0.77
( 3.84)
5.08
2X 2.54
8.55
8.15
12.5
12.1
(6.3)
19.65 MAX
4.7
4.4 1.32
1.22
2.79
2.59
0.47
0.34
4222214/B 08/2018
TO-220 - 19.65 mm max heightKCS0003B
TO-220
NOTES:
1. Dimensions are in millimeters. Any dimension in brackets or parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Reference JEDEC registration TO-220.
13
SCALE 0.850
www.ti.com
EXAMPLE BOARD LAYOUT
0.07 MAX
ALL AROUND
0.07 MAX
ALL AROUND
(1.7)
3X (1.2)
(2.54)
(5.08)
R (0.05)
2X (1.7)
METAL 2X SOLDER MASK
OPENING
4222214/B 08/2018
TO-220 - 19.65 mm max heightKCS0003B
TO-220
LAND PATTERN EXAMPLE
NON-SOLDER MASK DEFINED
SCALE:15X
123
OPENING
SOLDER MASK
A
SIZE
SCALE 4
PAGE
4OF
4222214
REV
B
REVISIONS
ENGINEER / DRAFTSMANDATEECRDESCRIPTIONREV J. NOQUIL / T. LEQUANG10/22/20152151829RELEASE NEW DRAWINGA E. PREISS / K. SINCERBOX08/17/20182175971CORRECT NOTE 1A
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