R1141Q 查看數據表（PDF） - RICOH Co.,Ltd.

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R1141Q

120mA 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, be

sure to use a 2.2µF or more capacitor COUT with good frequency characteristics and ESR (Equivalent Series Resistance).

(Note: When the additional ceramic capacitors are connected to the Output Pin with 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 line sufficient. When the impedance of these is high, it would be a cause of picking up the noise or

unstable operation. Connect a capacitor with as much as 1.0µF capacitor between VDD and GND pin as close as possible.

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

s TEST CIRCUITS

1 V OUT VDD 4

I OUT

V OUT V

R1141Q

SERIES

C2

2 GND CE 3

C1

* C1 = Ceramic 1.0µF

C2 = Ceramic 2.2µF

Fig.1 Standard test Circuit

1 VOUT

4

V DD

R1141Q

C2

SERIES

2 GND CE 3

A

C1

I SS

* C1 = Ceramic1.0µF

C2 = Ceramic 2.2µF

Fig.2 Supply Current Test Circuit

Rev. 1.10

-5-

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