R1

OUTPUT

R2

C

adj

C

OUT

0.1 F

10 F

Ground

High

Frequency

Bypass

Capacitor

High Input

Bypass

Capacitor

Power

LM317M

www.ti.com

SLVS297P – APRIL 2000 – REVISED MARCH 2014

9 Power Supply Recommendations

The LM317 is designed to operate from an input voltage supply range between 2.5-V to 40-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.

10 Layout

10.1 Layout Guidelines

•

It is recommended that the input terminal be bypassed to ground with a bypass-capacitor.

•

The optimum placement is closest to the VIN and GND terminals of the device. Care must be taken to

minimize the loop area formed by the bypass-capacitor connection, the VIN terminal, and the GND terminal of

the IC.

•

For operation at full rated load, it is recommended to use wide trace lengths to eliminate IR drop and heat

dissipation.

10.2 Layout Example

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