LM317L National Semiconductor, LM317L Datasheet

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LM317L

Manufacturer Part Number
LM317L
Description
Manufacturer
National Semiconductor
Datasheet

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© 2000 National Semiconductor Corporation
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 stan-
dard 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 situ-
ated 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
DS009064-4
DS009064
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 100 mA 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 80 dB ripple rejection
n Available in TO-92, SO-8, or 6-Bump micro SMD
n Output is short circuit protected
n See AN-1112 for micro SMD considerations
package
8-Pin SOIC
Top View
DS009064-5
www.national.com
March 2000

Related parts for LM317L

LM317L Summary of contents

Page 1

... 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 100 mA output current n Line regulation typically 0 ...

Page 2

... LM317LIBP 6-Bump micro SMD * LM317LIBPX Note: The micro SMD package marking is a single digit manufacturing Date Code only. www.national.com (Continued) DS009064-49 Package Marking LM317LZ LM317LM – – 2 micro SMD Laser Mark DS009064-50 Media Transport NSC Drawing 1.8k Units per Box Z03A Rails ...

Page 3

... OUT Max − 40V OUT (V − 15V IN OUT (V − 13V IN OUT − 40V OUT f 10kHz = 10V 120Hz ADJ = 10µF T 125˚C for the LM317L MAX 3 −55˚C to +150˚C Min Typ Max 0.01 0.04 0.1 0.5 0.04 0.2 50 100 0.2 1.20 1.25 1.30 0.02 0.07 0.3 1.5 0.65 3.5 1.5 2.5 100 200 300 25 ...

Page 4

Typical Performance Characteristics Load Regulation Adjustment Current Reference Voltage Temperature Stability www.national.com (Output capacitor = 0µF unless otherwise noted.) Current Limit DS009064-34 Dropout Voltage DS009064-36 Minimum Operating Current DS009064-38 4 DS009064-35 DS009064-37 DS009064-39 ...

Page 5

Typical Performance Characteristics Ripple Rejection Output Impedance Load Transient Response (Output capacitor = 0µF unless otherwise noted.) (Continued) Ripple Rejection DS009064-40 Line Transient Response DS009064-42 Thermal Regulation DS009064-44 5 DS009064-41 DS009064-43 DS009064-45 www.national.com ...

Page 6

... This performance is thus well inside the specification limit of 0.2%/ 0.2% maxi- mum. When the 1W pulse is ended, the thermal regulation again shows change as the gradients across the LM317L chip die out. Note that the load regulation error of about 14 mV (0.14%) is additional to the thermal regulation error ...

Page 7

... Internal to the LM317L current. No protection is needed for output voltages of 25V or less and 10µF capacitance. Figure 3 shows an LM317L with protection diodes included for use with outputs greater than 25V and high values of output capacitance. FIGURE 3. Regulator with Protection Diodes micro SMD does not sustain permanent damage from light exposure. Removing the light source will cause LM317L’ ...

Page 8

Schematic Diagram www.national.com 8 ...

Page 9

Typical Applications Digitally Selected Outputs *Sets maximum V OUT Adjustable Current Limiter 12 R1 240 Slow Turn-On 15V Regulator High Gain Amplifier DS009064-11 Precision Current Limiter DS009064-13 Adjustable Regulator with Improved Ripple Rejection DS009064-15 † Solid tantalum * Discharges C1 ...

Page 10

... Minimum load −5mA www.national.com Adjustable Regulator with Current Limiter DS009064-17 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. Regulator With 15mA Short Circuit Current DS009064-20 10 DS009064-18 Power Follower ...

Page 11

Typical Applications (Continued) 100mA Current Regulator DS009064-23 5V Logic Regulator with Electronic Shutdown * Minimum output 1.2V 1.2V–12V Regulator with Minimum Program Current DS009064-24 * Minimum load current Current Limited 6V Charger DS009064-26 * Sets peak current, ...

Page 12

Typical Applications (Continued) 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 DS009064-28 DS009064-29 ...

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 ...

Page 14

Typical Applications (Continued) 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 DS009064-1 Full output current not available at high input-output voltages † Optional — improves transient response *Needed if device ...

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

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

Page 17

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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