R5325K023B Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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производитель

R5325K023B

150mA 2ch LDO REGULATOR

RICOH Co.,Ltd. 

TECHNICAL NOTES

IN

C1

CE2

VOUT2

R5325x

Series

VDD

GND

CE1

VOUT1

OUT2

C3

OUT1

C2

R5325x

(External Components)

Output Capacitor; Ceramic Type

0.1µF

Kyocera

Murata

1.0µF

Kyocera

TDK

Murata

C1,C2,C3

CM05B104K06AB

GRM155B31C104KA87B

CM05X5R105K06AB

C1005JB0J105K

GRM155B30J105KE18B

1.Mounting on PCB

Make VDD and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result.

Connect a capacitor with a capacitance value as much as 1.0µF or more as C1 between VDD and GND pin, and

as close as possible to the pins.

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

short as possible.

2.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 capacitor C2 with good frequency characteristics and ESR (Equivalent Series Resistance).

(Note: If additional ceramic capacitors are connected with parallel to the output pin with an output capacitor for

phase compensation, the operation might be unstable. Because of this, test these ICs with as same external

components as ones to be used on the PCB.)

If you use a tantalum type capacitor and ESR value of the capacitor is large, output might be unstable.

Evaluate your circuit with considering frequency characteristics.

Depending on the capacitor size, manufacturer, and part number, the bias characteristics and temperature

characteristics are different. Evaluate the circuit with actual using capacitors.

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