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OUT
ADJ
R
V
= 1.25 V
I
R
R
2
2
1
1
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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
The LM117 and LM317-N series of adjustable 3-pin
1
Typ. 0.1% Load Regulation
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
exceptionally easy to use and require only two
Adjustable Output Down to 1.25 V
external resistors to set the output voltage. Further,
Current Limit Constant With Temperature
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
adjustment terminal is disconnected.
2 Applications
Automotive LED Lighting
Typically, no capacitors are needed unless the device
is situated more than 6 inches from the input filter
Battery Chargers
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
bypassed to achieve very high ripple rejection ratios
Microprocessor Supplies
that are difficult to achieve with standard 3-terminal
regulators.
Typical Application
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
complement, see LM137 (SNVS778) series data
*Needed if device is more than 6 inches from filter
sheet.
capacitors.
†Optional—improves transient response
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
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
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.


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