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LM317KC View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
LM317KC 3-Terminal Adjustable Regulator TI
Texas Instruments TI
LM317KC Datasheet PDF : 32 Pages
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LM317
SLVS044W – SEPTEMBER 1997 – REVISED OCTOBER 2014
10 Power Supply Recommendations
The LM317 is designed to operate from an input voltage supply range between 1.25 V to 37 V greater than the
output voltage. If the device is more than six inches from the input filter capacitors, an input bypass capacitor, 0.1
μF or greater, of any type is needed for stability.
11 Layout
11.1 Layout Guidelines
• It is recommended that the input terminal be bypassed to ground with a bypass capacitor.
• The optimum placement is closest to the input terminal of the device and the system GND. Care must be
taken to minimize the loop area formed by the bypass-capacitor connection, the input terminal, and the
system GND.
• For operation at full rated load, it is recommended to use wide trace lengths to eliminate I × R drop and heat
dissipation.
11.2 Layout Example
COUT
OUTPUT
R2
Cadj
Power
R1
High
Frequency
Bypass
Capacitor
0.1μF
High Input
Bypass
10μF Capacitor
Ground
Figure 25. Layout Example
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