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LM117, LM317-N
SNVS774P – MAY 2004 – REVISED OCTOBER 2015

LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator

1 Features 3 Description
•
1 Typ. 0.1% Load Regulation The LM117 and LM317-N series of adjustable 3-pin
positive voltage regulators are capable of supplying in
• Typ. 0.01%/V Line Regulation excess of 1.5 A over a 1.25-V to 37-V output range
• 1.5-A Output Current and a wide temperature range. They are
• Adjustable Output Down to 1.25 V exceptionally easy to use and require only two
• Current Limit Constant With Temperature external resistors to set the output voltage. Further,
both line and load regulation are better than standard
• 80-dB Ripple Rejection fixed regulators.
• Short-Circuit Protected Output
The LM117 and LM317-N offer full overload
• −55°C to 150°C Operating Temperature Range protection such as current limit, thermal overload
(LM117) protection and safe area protection. All overload
protection circuitry remains fully functional even if the
2 Applications adjustment terminal is disconnected.
• Automotive LED Lighting Typically, no capacitors are needed unless the device
• Battery Chargers is situated more than 6 inches from the input filter
capacitors, in which case an input bypass is needed.
• Post Regulation for Switching Supplies An optional output capacitor can be added to improve
• Constant Current Regulators transient response. The adjustment terminal can be
• Microprocessor Supplies bypassed to achieve very high ripple rejection ratios
that are difficult to achieve with standard 3-terminal
Typical Application regulators.
LM317-N Because the regulator is floating and detects 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.
That is, avoid short-circuiting the output.
By connecting a fixed resistor between the
adjustment pin and output, the LM117 and LM317-N
can be also 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 1.25 V where most loads draw
little current.
For applications requiring greater output current, see
data sheets for LM150 series (3 A), SNVS772, and
LM138 series (5 A), SNVS771. For the negative
*Needed if device is more than 6 inches from filter complement, see LM137 (SNVS778) series data
capacitors. sheet.
†Optional—improves transient response Device Information(1)
æ R2 ö
+ I ADJ (R2 )
PART NUMBER PACKAGE BODY SIZE (NOM)
VOUT = 1.25 V ç 1 +
†† è R1 ÷ø TO-3 (2) 38.94 mm x 25.40 mm
LM117
TO (3) 8.255 mm × 8.255 mm
TO-3 (2) 38.94 mm x 25.40 mm
TO-220 (3) 14.986 mm × 10.16 mm
TO-263 (3) 10.18 mm × 8.41 mm
LM317-N
SOT-223 (4) 6.50 mm × 3.50 mm
TO (3) 8.255 mm × 8.255 mm
TO-252 (3) 6.58 mm × 6.10 mm
(1) For all available packages, see the orderable addendum at
1
the end of the data sheet.

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.