LM317L-N Datasheet, PDF (1/27 Pages) Texas Instruments – LM317L 3-Terminal Adjustable Regulator

LM317L-N
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SNVS775J – MARCH 2000 – REVISED MARCH 2013
LM317L-N 3-Terminal Adjustable Regulator
Check for Samples: LM317L-N
FEATURES
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•2 Adjustable Output Down to 1.2V
• 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, SOIC-8, or 6-DSBGA
Package
• Output is Short Circuit Protected
• See AN-1112 (SNVA009) for DSBGA
Considerations
DESCRIPTION
The LM317L-N 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-N 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-N 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-N 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-N 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-N is available in a standard TO-92
transistor package, the SOIC-8 package, and 6-
DSBGA package. The LM317L-N is rated for
operation over a −40°C to 125°C range.
Connection Diagram
Figure 1. TO-92 Plastic package
Figure 2. 8-Pin SOIC - Top View
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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