R1141Q_17 Datasheet, PDF (15/16 Pages) RICOH electronics devices division – 120mA LDO REGULATOR

R1141Q
ESR vs. Output Current
When using these ICs, consider the following points:
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 capacitor COUT with good frequency characteristics and ESR (Equivalent Series
Resistance) of which is in the range described as follows:
The relations between IOUT (Output Current) and ESR of Output Capacitor are shown below. The conditions
when the white noise level is under 40µV (Avg.) are marked as the hatched area in the graph.
<Test conditions>
(1) VIN=VSET+1V
(2) Frequency band: 10Hz to 30MHz
(3) Temperature: 25°C
R1141Q151x
f=10HZ to 2MHZ,
CIN=Ceramic 1.0μF, COUT=Ceramic 2.2μF
100
R1141Q281x
f=10HZ to 2MHZ,
CIN=Ceramic 1.0μF, COUT=Ceramic 2.2μF
100
10
10
1
1
0.1
0.1
0.01
0
30
60
90
120
Output Current IOUT (mA)
0.01
0
30
60
90
120
Output Current IOUT (mA)
15