LM317L MDA

Manufacturer Part NumberLM317L MDA
Description3-Terminal Adjustable Regulator
ManufacturerNational Semiconductor
LM317L MDA datasheet
 
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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 func-
tional 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 stan-
dard 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 volt-
age, supplies of several hundred volts can be regulated as
long as the maximum input-to-output differential is not ex-
ceeded.
Connection Diagrams
TO-92 Plastic package
© 2005 National Semiconductor Corporation
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. Sup-
plies with electronic shutdown can be achieved by clamping
the adjustment terminal to ground which programs the out-
put 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 pack-
age. The LM317L is rated for operation over a −25˚C to
125˚C range.
Features
n Adjustable output down to 1.2V
n Guaranteed 100mA output current
n Line regulation typically 0.01%V
n Load regulation typically 0.1%
n Current limit constant with temperature
n Eliminates the need to stock many voltages
n Standard 3-lead transistor package
n 80dB ripple rejection
n 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
00906404
DS009064
February 2005
8-Pin SOIC
00906405
Top View
www.national.com

LM317L MDA Summary of contents

  • Page 1

    ... Connection Diagrams TO-92 Plastic package © 2005 National Semiconductor Corporation Also, it makes an especially simple adjustable switching regulator, a programmable output regulator connecting a fixed resistor between the adjustment and output, the LM317L can be used as a precision current regulator. Sup- ...

  • Page 2

    Connection Diagrams 6-Bump micro SMD *NC = Not Internally connected. Top View (Bump Side Down) Ordering Information Package Part Number TO-92 LM317LZ 8-Pin SOIC LM317LM * LM317LIBP 6-Bump micro SMD * LM317LIBPX Note: The micro SMD package marking is a ...

  • Page 3

    ... Absolute Maximum Ratings 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 Electrical Characteristics Parameter = 25˚C, 3V ≤ (V Line Regulation 25˚C, 5mA ≤ I Load Regulation ...

  • Page 4

    Typical Performance Characteristics (Output capacitor = 0µF unless otherwise noted.) Load Regulation Adjustment Current Reference Voltage Temperature Stability www.national.com 00906434 00906436 Minimum Operating Current 00906438 4 Current Limit 00906435 Dropout Voltage 00906437 00906439 ...

  • Page 5

    Typical Performance Characteristics Ripple Rejection Output Impedance Load Transient Response (Output capacitor = 0µF unless otherwise noted.) (Continued) 00906440 Line Transient Response 00906442 00906444 5 Ripple Rejection 00906441 00906443 Thermal Regulation 00906445 www.national.com ...

  • Page 6

    Application Hints In operation, the LM317L develops a nominal 1.25V refer- ence voltage between the output and adjustment REF terminal. The reference voltage is impressed across pro- gram resistor R1 and, since the voltage is constant, a con- ...

  • Page 7

    Application Hints (Continued) mum. When the 1W pulse is ended, the thermal regulation again shows a 7mV change as the gradients across the LM317L chip die out. Note that the load regulation error of about 14mV (0.14%) is additional to ...

  • Page 8

    www.national.com 8 ...

  • Page 9

    Typical Applications Digitally Selected Outputs *Sets maximum V OUT High Gain Amplifier Adjustable Current Limiter 12 ≤ R1 ≤ 240 Precision Current Limiter 00906411 † Solid tantalum *Discharges C1 if output is shorted to ground 00906412 00906413 00906414 9 Slow ...

  • Page 10

    Typical Applications Adjustable Regulator with Current Limiter Short circuit current is approximately 600 mV/R3, or 60mA (compared to LM317LZ’s 200mA current limit). At 25mA output only 3/4V of drop occurs in R3 and R4. 0V–30V Regulator Full output current not ...

  • Page 11

    Typical Applications (Continued) 100mA Current Regulator 1.2V–12V Regulator with Minimum Program Current *Minimum load current ≈ 50mA Constant Current Battery Charger for Nickel-Cadmium Batteries 5V Logic Regulator with Electronic Shutdown* *Minimum output ≈ 1.2V 00906423 00906424 *Sets peak ...

  • Page 12

    Typical Applications Q1, Q2: NSD134 or similar C1, C2: 1µF, 200V mylar** *Heat sink www.national.com (Continued) Short Circuit Protected 80V Supply Basic High Voltage Regulator 12 00906428 00906429 ...

  • Page 13

    Typical Applications (Continued) Q1, Q2: NSD134 or similar C1, C2: 1µF, 200V mylar** *Heat sink **Mylar is a registered trademark of DuPont Co. Tracking Regulator A1 = LM301A, LM307, or LF13741 only R1 matched resistors with good TC ...

  • Page 14

    Typical Applications Precision Reference with Short-Circuit Proof Output *R1–R4 from thin-film network, Beckman 694-3-R2K-D or similar 1.2V-25 Adjustable Regulator Full output current not available at high input-output voltages † Optional — improves transient response *Needed if device is more than ...

  • Page 15

    Physical Dimensions inches (millimeters) unless otherwise noted SO-8 Molded Package NS Package Number M08A TO-92 Plastic Package (Z) NS Package Number Z03A 15 www.national.com ...

  • Page 16

    ... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...