Maker : National Semiconductor
Part No. : LM317LIBP

  Datasheet PDF : LM317LIBP.pdf
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Product Information

LM317L 3-Terminal Adjustable Regulator March 2000 LM317L 3-Terminal Adjustable Regulator General Description The LM317L is an adjustable 3-terminal positive voltage regulator capable of supplying 100mA over a 1.2V to 37V output range. It is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. Also, the LM317L is available packaged in a standard TO-92 transistor package which is easy to use. In addition to higher performance than fixed regulators, the LM317L offers full overload protection. 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 LM317L 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. Also, it makes an especially simple adjustable switching regulator, 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. 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. The LM317L is available in a standard TO-92 transistor package, the SO-8 package, and 6-Bump micro SMD package. The LM317L is rated for operation over a −25˚C to 125˚C range. Features Adjustable output down to 1.2V Guaranteed 100 mA output current Line regulation typically 0.01%V Load regulation typically 0.1% Current limit constant with temperature Eliminates the need to stock many voltages Standard 3-lead transistor package 80 dB ripple rejection Available in TO-92, SO-8, or 6-Bump micro SMD package n Output is short circuit protected n See AN-1112 for micro SMD considerations n n n n n n n n n Connection Diagrams TO-92 Plastic package 8-Pin SOIC DS009064-4 DS009064-5 Top View © 2000 National Semiconductor Corporation DS009064 www.national.com LM317L Connection Diagrams (Continued) micro SMD Laser Mark 6-Bump micro SMD DS009064-50 DS009064-49 *NC = Not Internally connected. Top View (Bump Side Down) Package TO-92 8-Pin SOIC 6-Bump micro SMD Part Number LM317LZ LM317LM * LM317LIBP * LM317LIBPX Package Marking LM317LZ LM317LM – – Media Transport 1.8k Units per Box Rails 250 Units Tape and Reel 3k Units Tape and Reel NSC Drawing Z03A M08A BPA06HPA Note: The micro SMD package marking is a single digit manufacturing Date Code only. www.national.com 2 LM317L Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Dissipation Input-Output Voltage Differential Operating Junction Temperature Range Internally Limited 40V −40˚C to +125˚C Storage Temperature Lead Temperature (Soldering, 4 seconds) Output is Short Circuit Protected ESD rating to be determined. −55˚C to +150˚C 260˚C Electrical Characteristics (Note 2) Parameter Line Regulation Load Regulation Thermal Regulation Adjustment Pin Current Adjustment Pin Current Change Reference Voltage Line Regulation Load Regulation Temperature Stability Minimum Load Current Current Limit Rms Output Noise, % of VOUT Ripple Rejectio...

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