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LM317

    3-Terminal Adjustable Regulator
  

See Also:
  
LM1117 - LOWER DROPOUT VOLTAGE/SMALLER PACKAGE
Generic P/N 317

Contents

Parametric Table
 Multiple Output Capability   No 
 On/Off Pin   No 
 Error Flag   No 
 Input Voltage, min (Volt)   4.20 
 Input Voltage, max (Volt)   40,37 
 Output Current, max   1000 mA,1500 mA,500 mA 
 Watchdog   No 
 Output Voltage, min (Volt)   1.20 
 Output Voltage, max (Volt)   37 

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.


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

Datasheet

TitleSize
(in Kbytes)
Date
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LM117/LM317A/LM317 3-Terminal Adjustable Regulator 654 Kbytes 4-Sep-01 View Online Download Receive via Email
LM117/LM317A/LM317 3-Terminal Adjustable Regulator (JAPANESE)
288 Kbytes   View Online Download Receive via Email

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Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples
&
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Type# pinsSPICEIBISQuantity$US each
LM317AEMPSOT-2234Full productionN/AN/ASamples
Buy Now
1K+$0.5700reel
of
1000
¢2¢T
N07A
LM317EMPSOT-2234Full productionN/AN/ASamples
Buy Now
1K+$0.3600reel
of
1000
¢2¢T
N01A
LM317AEMPXSOT-2234Full productionN/AN/A 
Buy Now
1K+$0.5700reel
of
2000
¢2¢T
N07A
LM317EMPXSOT-2234Full productionN/AN/A 
Buy Now
1K+$0.3600reel
of
2000
¢2¢T
N01A
LM317ATTO 2203Full productionN/AN/A24 Hour Samples
Buy Now
1K+$0.6500tube
of
45
[logo]¢U¢Z¢2¢T
LM317AT P+
LM317TTO 2203Full productionN/AN/A24 Hour Samples
Buy Now
2500+$0.2070tube
of
45
[logo]¢U¢Z¢2¢T
LM317T P+
LM317MDTTO 2523Full productionN/AN/A24 Hour Samples
Buy Now
1K+$0.2060tube
of
75
[logo]¢U¢Z¢2¢T
LM317
MDT
LM317MDTXTO 2523Full productionN/AN/A 1K+$0.2060reel
of
2500
[logo]¢U¢Z¢2¢T
LM317
MDT
LM317STO 2633Full productionN/AN/A24 Hour Samples
Buy Now
1K+$0.4400tube
of
45
[logo]¢U¢Z¢2¢T
LM317S
P+
LM317SXTO 2633Full productionN/AN/A 
Buy Now
1K+$0.4400reel
of
500
[logo]¢U¢Z¢2¢T
LM317S
P+
LM317HTO-393Full productionN/AN/A 
Buy Now
1K+$1.3600bag
of
500
[logo]¢Z¢2¢T LM317HP+
LM317K STEELTO-33Full productionN/AN/A 
Buy Now
1K+$1.7600tray
of
50
[logo]¢Z¢2¢T
LM317K
STEELP+
LM317H MDCDieFull productionN/AN/ASamples  tray
of
N/A
-
LM317K MDCDieFull productionN/AN/A   tray
of
N/A
-
LM317H MWCWaferFull productionN/AN/A   N/A-
LM317K MWCWaferFull productionN/AN/A   N/A-

Design Tools

TitleSize
(in Kbytes)
Date
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LM317MDT Qualification Package 803 Kbytes 19-Oct-1999 View Online Download Receive via Email

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Application Notes

TitleSize
(in Kbytes)
Date
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LB-35: Adjustable 3-Terminal Regulator for Low-Cost Battery Charging Systems 80 Kbytes 28-Jun-96 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-181: Application Note 181 3-Terminal Regulator Is Adjustable 123 Kbytes 8-Nov-00 View Online Download Receive via Email
LB-47: High Voltage Adjustable Power Supplies 69 Kbytes 28-Jun-96 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-353: MM58167B Real-Time Clock Design Guide 263 Kbytes 4-Nov-95 View Online Download Receive via Email
AN-1148: Application Note 1148 Linear Regulators: Theory Of Operation and Compensation 143 Kbytes 24-May-00 View Online Download Receive via Email
LB-46: A New Production Technique for Trimming Voltage Regulators 91 Kbytes 28-Jun-96 View Online Download Receive via Email

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If you have trouble printing, see Printing Problems.


[Information as of 26-Oct-2001]
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