LM317-N-MIL Datasheet, PDF (1/39 Pages) Texas Instruments – Wide Temperature Three-Pin Adjustable Regulator

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LM317-N-MIL
SNVSAY0 – JUNE 2017
LM317-N-MIL Wide Temperature Three-Pin Adjustable Regulator
1 Features
•1 Typ. 0.1% Load Regulation
• Typ. 0.01%/V Line Regulation
• 1.5-A Output Current
• Adjustable Output Down to 1.25 V
• Current Limit Constant With Temperature
• 80-dB Ripple Rejection
• Short-Circuit Protected Output
2 Applications
• Automotive LED Lighting
• Battery Chargers
• Post Regulation for Switching Supplies
• Constant Current Regulators
• Microprocessor Supplies
Typical Application
*Needed if device is more than 6 inches from filter
capacitors.
†Optional—improves transient response
†† ^VOUT
= 1.25 V
æçè₁₊
R2
R1
ö
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+
I_ADJ
(R₂
)
3 Description
The LM317-N-MIL adjustable 3-pin positive voltage
regulator is capable of supplying in excess of 1.5 A
over a 1.25-V to 37-V output range and a wide
temperature range. The LM317-N-MIL is 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.
The LM317-N-MIL offers full overload protection,
such as current limit, thermal overload protection, and
safe area protection. All overload protection circuitry
remains fully functional even if the adjustment
terminal is disconnected.
Typically, 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
that are difficult to achieve with standard 3-terminal
regulators.
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 LM317-N-MIL 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
sheet.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
TO-3 (2)
38.94 mm x 25.40 mm
TO-220 (3)
14.986 mm × 10.16 mm
LM317-N-MIL
TO-263 (3)
SOT-223 (4)
10.18 mm × 8.41 mm
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.