R1

OUTPUT

R2

C

adj

C

OUT

0.1 F

10 F

Ground

High

Frequency

Bypass

Capacitor

High Input

Bypass

Capacitor

Power

LM317L

SLCS144E – JULY 2004 – REVISED OCTOBER 2014

www.ti.com

10 Power Supply Recommendations

The LM317L device is designed to operate from an input voltage supply range between 2.5 V to 32 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 pin be bypassed to ground with a bypass-capacitor.

•

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

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

system.

•

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

dissipation.

11.2 Layout Example

Figure 11. Layout Diagram

14

Submit Documentation Feedback

Copyright © 2004–2014, Texas Instruments Incorporated

Product Folder Links: LM317L