LM317L MWA

Manufacturer Part NumberLM317L MWA
DescriptionLM317L 3-Terminal Adjustable Regulator; ; Container: Wafer Jar
ManufacturerNational Semiconductor
LM317L MWA datasheet
 
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LM317L
3-Terminal Adjustable Regulator
General Description
The LM317L is an adjustable 3-terminal positive voltage reg-
ulator 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 sit-
uated more than 6 inches from the input filter capacitors in
which case an input bypass is needed. An optional output ca-
pacitor 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 “float-
ing” 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 reg-
ulator, a programmable output regulator, or by connecting a
Connection Diagrams
TO-92 Plastic package
© 2008 National Semiconductor Corporation
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 adjust-
ment 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 pack-
age, 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 100mA 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
80dB ripple rejection
Available in TO-92, SO-8, or 6-Bump micro SMD package
Output is short circuit protected
See AN-1112 for micro SMD considerations
906404
9064
April 9, 2008
8-Pin SOIC
906405
Top View
www.national.com

LM317L MWA Summary of contents

  • Page 1

    ... Also, it makes an especially simple adjustable switching reg- ulator, a programmable output regulator connecting a Connection Diagrams TO-92 Plastic package © 2008 National Semiconductor Corporation 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 adjust- ment terminal to ground which programs the output to 1 ...

  • Page 2

    SMD *NC = Not Internally connected. Top View (Bump Side Down) Ordering Information Package Part Number TO-92 LM317LZ 8-Pin SOIC LM317LM * LM317LIBP * LM317LIBPX 6-Bump micro SMD * LM317LITP * LM317LITPX Note: The micro SMD package marking ...

  • 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 Line Regulation T J Load Regulation T J Thermal Regulation T J Adjustment Pin Current ...

  • Page 4

    Typical Performance Characteristics Load Regulation Adjustment Current Reference Voltage Temperature Stability www.national.com (Output capacitor = 0μF unless otherwise noted.) 906434 Dropout Voltage 906436 Minimum Operating Current 906438 4 Current Limit 906435 906437 906439 ...

  • Page 5

    Ripple Rejection 906440 Output Impedance 906442 Load Transient Response 906444 Ripple Rejection Line Transient Response Thermal Regulation 5 906441 906443 906445 www.national.com ...

  • Page 6

    Application Hints In operation, the LM317L develops a nominal 1.25V reference voltage between the output and adjustment terminal. REF The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I ...

  • Page 7

    Note that the load regulation error of about 14mV (0.14%) is additional to the thermal regulation error. PROTECTION DIODES When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to ...

  • Page 8

    www.national.com 8 ...

  • Page 9

    Typical Applications Digitally Selected Outputs *Sets maximum V OUT High Gain Amplifier Adjustable Current Limiter ≤ ≤ 240 Precision Current Limiter 906411 †Solid tantalum *Discharges C1 if output is shorted to ground 906412 906413 Adjustable Regulator with Current ...

  • Page 10

    Regulator Full output current not available at high input-output voltages Regulator With 15mA Short Circuit Current Adjusting Multiple On-Card Regulators with Single Control* *All outputs within ± 100mV †Minimum load −5mA www.national.com 906419 906420 10 Power Follower 906421 906422 ...

  • Page 11

    Current Regulator 1.2V–12V Regulator with Minimum Program Current ≈ *Minimum load current 2 mA 50mA Constant Current Battery Charger for Nickel-Cadmium Batteries 5V Logic Regulator with Electronic Shutdown* 906423 *Minimum output 906424 *Sets peak current, I **1000μF is recommended ...

  • Page 12

    Q1, Q2: NSD134 or similar C1, C2: 1μF, 200V mylar** *Heat sink www.national.com Short Circuit Protected 80V Supply Basic High Voltage Regulator 12 906428 906429 ...

  • Page 13

    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 Precision High Voltage Regulator R1 matched resistors with good ...

  • Page 14

    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 6 inches from filter capacitors Fully Protected (Bulletproof) Lamp Driver www.national.com ...

  • Page 15

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

  • Page 16

    TO-92 Plastic Package (Z) NS Package Number Z03A 16 ...

  • Page 17

    NOTE: UNLESS OTHERWISE SPECIFIED. 1. EPOXY COATING 2. 63Sn/37Pb EUTECTIC BUMP. 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION PINS ARE NUMBERED COUNTERCLOCKWISE. 5. XXX IN DRAWING ...

  • Page 18

    NOTE: UNLESS OTHERWISE SPECIFIED. 1. EPOXY COATING 2. 63Sn/37Pb EUTECTIC BUMP. 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION PINS ARE NUMBERED COUNTERCLOCKWISE. 5. XXX IN DRAWING ...

  • Page 19

    Notes 19 www.national.com ...

  • Page 20

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