LM317L-N_16 Datasheet, PDF (1/37 Pages) Texas Instruments – 3-Terminal Adjustable Regulator

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
LM317L-N
SNVS775K – MARCH 2000 – REVISED APRIL 2016
LM317L-N 3-Terminal Adjustable Regulator
1 Features
•1 Adjustable Output Down to 1.2 V
• 100-mA 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
• 80-dB Ripple Rejection
• Available in 3-Pin TO-92, 8-Pin SOIC, or 6-pin
DSBGA Packages
• Output is Short-Circuit Protected
• See AN-1112 (SNVA009) for DSBGA
Considerations
2 Applications
• Automotive LED Lighting
• Battery Chargers
• Post Regulation for Switching Supplies
• Constant-Current Regulators
• Microprocessor Supplies
Schematic Diagram
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
3 Description
The LM317L-N is an adjustable 3-terminal positive
voltage regulator capable of supplying 100 mA over a
1.2-V to 37-V output range. The LM317L-N is easy to
use and requires only two external resistors to set the
output voltage. Both line and load regulation are
better than standard fixed regulators. The LM317L-N
is available packaged in a standard, easy-to-use
TO-92 transistor package.
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 required unless the
device is situated more than 6 inches from the input
filter capacitors, in which case an input bypass is
required. 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. Because
the regulator is floating and sees only the input-to-
output differential voltage, supplies of several
hundred volts can be regulated, provided the
maximum input-to-output differential is not exceeded.
The LM317L-N makes a 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 1.2 V, where
most loads draw little current.
The LM317L-N is available in a standard 3-pin TO-92
transistor package, the 8-pin SOIC package, and 6-
pin DSBGA package. The LM317L-N is rated for
operation over a −40°C to 125°C range.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TO-92 (3)
4.30 mm × 4.30 mm
LM317L-N
SOIC (8)
3.91 mm × 4.90 mm
DSBGA (6)
1.68 mm × 1.019 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.