317LM LM317LM Datasheet

317LM Datasheet PDF, Equivalent


Part Number

317LM

Description

LM317LM

Manufacture

National Semiconductor

Total Page 17 Pages
Datasheet
Download 317LM Datasheet


317LM
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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 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.
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
package
n Output is short circuit protected
n See AN-1112 for micro SMD considerations
Connection Diagrams
TO-92 Plastic package
8-Pin SOIC
DS009064-4
DS009064-5
Top View
© 2000 National Semiconductor Corporation DS009064
www.national.com

317LM
Connection Diagrams (Continued)
6-Bump micro SMD
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micro SMD Laser Mark
DS009064-50
DS009064-49
*NC = Not Internally connected.
Top View
(Bump Side Down)
Package
Part Number
Package Marking
TO-92
LM317LZ
LM317LZ
8-Pin SOIC
LM317LM
LM317LM
6-Bump micro
SMD
* LM317LIBP
* LM317LIBPX
Note: The micro SMD package marking is a single digit manufacturing Date Code only.
Media Transport
1.8k Units per Box
Rails
250 Units Tape and Reel
3k Units Tape and Reel
NSC Drawing
Z03A
M08A
BPA06HPA
www.national.com
2


Features www.DataSheet4U.com LM317L 3-Terminal A djustable Regulator March 2000 LM317L 3-Terminal Adjustable Regulator Genera l Description The LM317L is an adjustab le 3-terminal positive voltage regulato r capable of supplying 100mA over a 1.2 V to 37V output range. It is exceptiona lly easy to use and requires only two e xternal resistors to set the output vol tage. Further, both line and load regul ation are better than standard fixed re gulators. Also, the LM317L is available packaged in a standard TO-92 transisto r package which is easy to use. In addi tion to higher performance than fixed r egulators, the LM317L offers full overl oad protection. Included on the chip ar e current limit, thermal overload prote ction and safe area protection. All ove rload protection circuitry remains full y functional even if the adjustment ter minal is disconnected. Normally, no cap acitors are needed unless the device is situated more than 6 inches from the i nput filter capacitors in which case an input bypass is needed..
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