R1131x

6

TECHNICAL NOTES

When using these ICs, consider the following points:

Phase Compensation

In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For

this purpose, be sure to use a 1.0

(Equivalent Series Resistance).

(Note: If a tantalum capacitor is connected to the Output pin for phase compensation, if the ESR value of the

capacitor is too large, the operation might be unstable. Because of this, test these ICs with as same external

components as ones to be used on the PCB.)

Chip capacitor characteristics of Bias dependence and Temperature characteristics may vary depending on its

size, manufacturer, and part number.

PCB Layout

Set external components, especially the output capacitor, as close as possible to the ICs, and make wiring as

short as possible.

TYPICAL APPLICATION

GND

OUT

R1131x

Series

C2

C1

IN

OUT

CE

<External Components examples>

CM05X5R105K06AB (Kyocera)

C1005JBOJ105K (TDK)

GRM155B30J105KE18B (Murata)

Output Capacitor; 1.0

µF or more capacity ceramic Type

< 1.0V, Tantalum Type is recommended)

Input Capacitor, 1.0

µF or more capacity ceramic Type