R1113Z211A データシートの表示（PDF） - RICOH Co.,Ltd.

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R1113Z211A

LOW NOISE 150mA LDO REGULATOR

RICOH Co.,Ltd. 

s 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, use

a capacitor COUT with good frequency characteristics and ESR (Equivalent Series Resistance).

We use Ceramic Capacitors for evaluation of these ICs.

Recommended Capacitors; GRM40X5R225K6.3 (Murata)

GRM40-034X5R335K6.3 (Murata)

GRM40-034X5R475K6.3 (Murata)

(Note: When the additional ceramic capacitors are connected 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.)

PCB Layout

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 2.2µF or more 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.

Rev. 1.11

-7-

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