R1141Q Datasheet, PDF (5/15 Pages) RICOH electronics devices division – SC82 120mA LDO REGULATOR

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-