RP112x

No. EA-258-250325

8

APPLICATION INFORMATION

TYPICAL APPLICATIONS

C1

RP112x

VDD

VOUT

CE

GND

C2

VOUT

CE Control

External Components

Symbol

Description

C1 (CIN)

1.0 µF, Ceramic Capacitor, GRM155B31A105KE15, MURATA

C2 (COUT)

1.0 µF, Ceramic Capacitor, GRM155B31A105KE15, MURATA

TECHNICAL NOTES

Phase Compensation

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

this purpose, use a 1.0 F or more capacitor C2.

In case of using a tantalum capacitor, the output may be unstable due to inappropriate ESR. Therefore, the

full range of operating conditions for the capacitor in the application should be considered.

PCB Layout

The high impedances of VDD and GND could be a reason for the noise pickup and unstable operation.

Therefore, it is imperative that the impedances of VDD and GND be the lowest possible. Also, place a 1.0 µF

or more capacitor (C1) between VDD pin and GND pin as close as possible to each other.

As for C2 output capacitor that is used for phase compensation, place it between VOUT pin and GND as close

as possible to each other (Refer to TYPICAL APPLICATIONS).