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


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


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 (see below)

Application Notes (see below)


Connection Diagram


*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to View Online Click link below to Download Click link below to Receive via Email
LM117/LM317A/LM317 3-Terminal Adjustable Regulator 1005 Kbytes 9-Apr-07 View Online Download Receive via Email
LM117/LM317A/LM317 3-Terminal Adjustable Regulator (Japanese)
743 Kbytes   View Online Download Receive via Email

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


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-2234STD
NOPB
1
1
260
260
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.72reel
of
1000
XYTT
N07A
6 weeks20000
LM317EMPSOT-2234STD
NOPB
1
1
260
260
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.49reel
of
1000
XYTT
N01A
6 weeks2000
LM317AEMPXSOT-2234STD
NOPB
1
1
260
260
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.72reel
of
2000
XYTT
N07A
8 weeks7500
LM317EMPXSOT-2234STD
NOPB
1
1
260
260
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.49reel
of
2000
XYTT
N01A
6 weeks15000
LM317ATTO-2203STD
NOPB
1
1
NA
NA
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.71rail
of
45
NSUZXYTTE#
LM317AT P+
8 weeks2000
LM317TTO-2203STD
NOPB
1
1
NA
NA
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.71rail
of
45
NSUZXYTTE#
LM317T P+
6 weeks2500
LM317AMDTTO-2523STD
NOPB
1
2
235
260
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.64rail
of
75
NSUZXYTT
LM317
AMDT
8 weeks1000
LM317MDTTO-2523STD
NOPB
1
2
235
260
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.54rail
of
75
NSUZXYTT
LM317
MDT
8 weeks7500
LM317AMDTXTO-2523STD
NOPB
1
2
235
260
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.64reel
of
2500
NSUZXYTT
LM317
AMDT
6 weeks10000
LM317MDTXTO-2523STD
NOPB
1
2
235
260
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.54reel
of
2500
NSUZXYTT
LM317
MDT
8 weeks3000
LM317STO-2633STD
NOPB
3
3
235
245
RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.79rail
of
45
NSUZXYTTE#
LM317S
P+
8 weeks5000
LM317SXTO-2633STD
NOPB
3
3
235
245
RoHS N/A Full productionN/A
 
Buy Now
1K+$0.79reel
of
500
NSUZXYTTE#
LM317S
P+
6 weeks7500
LM317AHTO-393STD
NOPB
1
1
NA
NA
RoHS N/A Full productionN/A
 
Buy Now
1K+$4.40box
of
500
NSZXYTTE# LM317AHP+
6 weeks2500
LM317HTO-393STD
NOPB
1
1
NA
NA
RoHS N/A Full productionN/A
 
Buy Now
1K+$4.40box
of
500
NSZXYTTE# LM317HP+
6 weeks2000
LM317K STEELTO-32STD
NOPB
1
1
NA
NA
RoHS N/A Full productionN/A
 
Buy Now
1K+$15.90tray
of
50
NS
ZXYTTE#
LM317K
STEELP+
6 weeks500
LM317K MDCUnpackaged DieLifetime buyN/A
  CALLtray
of
N/A
-
N/AN/A
LM317K MWCWaferLifetime buyN/A
  CALLwafer jar
of
N/A
-
N/AN/A
LM317A MWCWaferFull productionN/A
  CALLwafer jar
of
N/A
-
N/A40000

Obsolete Parts

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM317AK
LM317K
NATIONAL SEMICONDUCTOR
06/14/94
LM317AK STEEL
LM317K STEEL
NATIONAL SEMICONDUCTOR
07/15/95
LM317AS
LM317AEMP
NATIONAL SEMICONDUCTOR
09/03/2002
LM317ASX
LM317AEMPX
NATIONAL SEMICONDUCTOR
09/03/2002
LM317K MDC
UA317
NATIONAL SEMICONDUCTOR CORP
12/03/2008
LM317K MDC
ľA317
NATIONAL SEMICONDUCTOR CORP
12/03/2008
LM317K MWC
UA317
NATIONAL SEMICONDUCTOR CORP
12/03/2008
LM317K MWC
ľA317
NATIONAL SEMICONDUCTOR CORP
12/03/2008
LM317KC
LM317K STEEL
NATIONAL SEMICONDUCTOR
06/14/94
LM317MP
NSC LM317T
NATIONAL SEMICONDUCTOR
07/14/96

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 Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LM317A MWCSLM0395460028575002810823427
LM317AEMPSLM0395460028575002810823427
LM317AEMPXSLM0395460028575002810823427
LM317AMDTSLM0395460028575002810823427
LM317AMDTXSLM0395460028575002810823427
LM317ATSLM0395460028575002810823427
LM317EMPSLM0395460028575002810823427
LM317EMPXSLM0395460028575002810823427
LM317MDTSLM0395460028575002810823427
LM317MDTXSLM0395460028575002810823427
LM317SSLM0395460028575002810823427
LM317SXSLM0395460028575002810823427
LM317TSLM0395460028575002810823427

For more information on Reliability Metrics, please click here.


Design Tools


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

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Application Notes


TitleSize in Kbytes Date Click link below to View Online Click link below to Download Click link below to Receive via Email
AN-181: Application Note 181 3-Terminal Regulator is Adjustable 165 Kbytes 3-Oct-02 View Online Download Receive via Email
AN-1164: Application Note 1164 LM3647 Reference Design User's Manual 197 Kbytes 9-Mar-01 View Online Download Receive via Email
AN-1165: Application Note 1165 Configuration Guide for LM3647 Reference Design 32 Kbytes 28-Sep-00 View Online Download Receive via Email
AN-1378: Application Note 1378 Method For Calculating Output Voltage Tolerances in Adjustable Regulators 647 Kbytes 15-Jul-05 View Online Download Receive via Email
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 View Online Download Receive via Email
AN-1651 (Chinese): Application Note 1651 Keeping Up with the Expanding Demands of High-Performance Audio
350 Kbytes  

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

[Information as of 5-Sep-2008]