LM317 - 3-Terminal Adjustable Regulator
Datasheet Packaging Samples & Pricing Reliability Design Tools Application Notes Knowledge Base

Features
Guaranteed 1% output voltage tolerance (LM317A)
Guaranteed max. 0.01%/V line regulation (LM317A)
Guaranteed max. 0.3% load regulation (LM117)
Guaranteed 1.5A output current
Adjustable output down to 1.2V
Current limit constant with temperature
P + Product Enhancement tested
80 dB ripple rejection
Output is short-circuit protected

General Description


The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1.5A over a 1.2V to 37V output range. More...


  Typical Application
*click for larger image


ParametersValues
Output Current 500, 1500, 1000 mA
Input Min Voltage 4.2 Volt
Input Max Voltage 40, 37 Volt
Adjustable Output Yes
On/Off Pin No
Error Flag No
Temperature Min -40, 0 deg C
Temperature Max 125 deg C
RegType Linear Regulator


Typical Performance


*click for larger image


  Also Recommended
LP38690Lower Quiescent Current, Stable With Ceramic Output Capacitors
LP38692Lower Quiescent Current, Stable With Ceramic Output Capacitors & Enable Pin
LM1086Lower Dropout Voltage
Additional Resources
Online Seminars Design Tools

Application Notes


Connection Diagram


*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM117/LM317A/LM317 3-Terminal Adjustable Regulator 1017
Kbytes
21-Oct-08 Download
LM117/LM317A/LM317 3-Terminal Adjustable Regulator (Japanese)
743 Kbytes   Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LM317AEMPSOT-2234NOPB
STD
1
1
260
260
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.72reel
of
1000
XYTT
N07A
16 weeks20000
LM317EMPSOT-2234NOPB
STD
1
1
260
260
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.49reel
of
1000
XYTT
N01A
6 weeks5000
LM317AEMPXSOT-2234NOPB
STD
1
1
260
260
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.72reel
of
2000
XYTT
N07A
6 weeks2500
LM317EMPXSOT-2234NOPB
STD
1
1
260
260
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.49reel
of
2000
XYTT
N01A
6 weeks3000
LM317ATTO-2203NOPB
STD
1
1
NA
NA
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.70rail
of
45
NSUZXYTTE#
LM317AT P+
16 weeks7500
LM317TTO-2203NOPB
STD
1
1
NA
NA
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.70rail
of
45
NSUZXYTTE#
LM317T P+
6 weeks2500
LM317AMDTTO-2523NOPB
STD
2
1
260
235
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.64rail
of
75
NSUZXYTT
LM317
AMDT
8 weeks2000
LM317MDTTO-2523NOPB
STD
2
1
260
235
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.53rail
of
75
NSUZXYTT
LM317
MDT
8 weeks2000
LM317AMDTXTO-2523NOPB
STD
2
1
260
235
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.64reel
of
2500
NSUZXYTT
LM317
AMDT
6 weeks5000
LM317MDTXTO-2523NOPB
STD
2
1
260
235
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.53reel
of
2500
NSUZXYTT
LM317
MDT
8 weeks3000
LM317STO-2633NOPB
STD
3
3
245
235
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.76rail
of
45
NSUZXYTTE#
LM317S
P+
8 weeks2000
LM317SXTO-2633NOPB
STD
3
3
245
235
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.76reel
of
500
NSUZXYTTE#
LM317S
P+
8 weeks7500
LM317AHTO-393NOPB
STD
1
1
NA
NA
RoHS N/A Full productionN/A
 
Buy Now
1K+$5.33box
of
500
NSZXYTTE# LM317AHP+
8 weeks1000
LM317HTO-393NOPB
STD
1
1
NA
NA
RoHS N/A Full productionN/A
 
Buy Now
1K+$5.33box
of
500
NSZXYTTE# LM317HP+
6 weeks2000
LM317K STEELTO-32NOPB
STD
1
1
NA
NA
RoHS N/A Full productionN/A
 
Buy Now
1K+$22.00tray
of
50
NS
ZXYTTE#
LM317K
STEELP+
10 weeks500
LM317A MWCWaferLifetime buyN/A
  CALLwafer jar
of
N/A
-
6 weeks40000

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM317A MWC
LM117H MD8
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM317AS
NONE
NONE
03 Sep 2002
LM317ASX
NONE
NONE
03 Sep 2002
LM317K MDC
A317
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM317K MWC
A317
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM317L MWA
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM317LIBP
NONE
NATIONAL SEMICONDUCTOR
24 Jul 2009
LM317LIBPX
NONE
NATIONAL SEMICONDUCTOR
24 Jul 2009

General Description


The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1.5A over a 1.2V to 37V output range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. Also, the LM117 is packaged in standard transistor packages which are easily mounted and handled.

In addition to higher performance than fixed regulators, the LM117 series offers full overload protection available only in IC's. Included on the chip are current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.

Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios which are difficult to achieve with standard 3-terminal regulators.

Besides replacing fixed regulators, the LM117 is useful in a wide variety of other applications. Since the regulator is “floating” and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., avoid short-circuiting the output.

Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment pin and output, the LM117 can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current.

For applications requiring greater output current, see LM150 series (3A) and LM138 series (5A) data sheets. For the negative complement, see LM137 series data sheet.

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM317A MWCSLM04404600353250011002356520
LM317AEMPSLM04404600353250011002356520
LM317AEMPXSLM04404600353250011002356520
LM317AMDTSLM04404600353250011002356520
LM317AMDTXSLM04404600353250011002356520
LM317ATSLM04404600353250011002356520
LM317EMPSLM04404600353250011002356520
LM317EMPXSLM04404600353250011002356520
LM317MDTSLM04404600353250011002356520
LM317MDTXSLM04404600353250011002356520
LM317SSLM04404600353250011002356520
LM317SXSLM04404600353250011002356520
LM317TSLM04404600353250011002356520

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Design Tools


TitleSize in Kbytes Date Click link below to Download    
LM317MDT Qualification Package 803 Kbytes 19-Oct-1999 View Online Download  

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Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-181: Application Note 181 3-Terminal Regulator Is Adjustable 165
Kbytes
1-May-04 Download
AN-1164: Application Note 1164 LM3647 Reference Design User`s Manual 196
Kbytes
14-May-04 Download
AN-1165: Application Note 1165 Configuration Guide for LM3647 Reference Design 32
Kbytes
15-May-04 Download
AN-1378: Application Note 1378 Method For Calculating Output Voltage Tolerances in Adjustable Regulators 647
Kbytes
15-Jul-05 Download
AN-1378 (Chinese): Application Note 1378 Method For Calculating Output Voltage Tolerances in Adjustable Regulators
383 Kbytes  
AN-1651: Application Note 1651 Keeping Up with the Expanding Demands of High-Performance Audio 206
Kbytes
10-Jul-07 Download
AN-1651 (Chinese): Application Note 1651 Keeping Up with the Expanding Demands of High-Performance Audio
350 Kbytes  

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More Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-298: Application Note 298 Isolation Techniques for Signal Conditioning 379
Kbytes
2-Oct-02 Download
AN-103: Application Note 103 LM340 Series Three Terminal Positive Regulators 421
Kbytes
3-Oct-02 Download
AN-263: Application Note 263 Sine Wave Generation Techniques 350
Kbytes
26-May-09 Download
AN-293: Application Note 293 Control Applications of CMOS DACs 385
Kbytes
4-Oct-04 Download
AN-288: Application Note 288 System-Oriented DC-DC Conversion Techniques 405
Kbytes
3-Oct-02 Download
AN-260: Application Note 260 A 20-Bit (1 ppm) Linear Slope-Integrating A/D Converter 148
Kbytes
3-Oct-02 Download
AN-446: A 150W IC Op Amp Simplifies Design of Power Circuits 252
Kbytes
4-Nov-95 Download
AN-301: Application Note 301 Signal Conditioning for Sophisticated Transducers 579
Kbytes
2-Oct-02 Download
AN-271: Application Note 271 Applying the New CMOS MICRO-DAC 230
Kbytes
4-Oct-04 Download
AN-271 (Japanese): Application Note 271 Applying the New CMOS MICRO-DAC
342 Kbytes   Download
AN-294: Application Note 294 Special Sample and Hold Techniques 233
Kbytes
4-Oct-04 Download
AN-307: Application Note 307 Introducing the MF10: A Versatile Monolithic Active Filter Building Block 384
Kbytes
10-Oct-02 Download
AN-307 (Japanese): Application Note 307 Introducing the MF10: A Versatile Monolithic Active Filter Building Block
402 Kbytes   Download
AN-828: Application Note 828 Increasing the High Speed Torque of Bipolar Stepper Motors 808
Kbytes
1-Oct-02 Download
AN-828 (Japanese): Application Note 828 Increasing the High Speed Torque of Bipolar Stepper Motors
362 Kbytes   Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 7-Nov-2009]