R1140Q Datasheet, PDF (18/18 Pages) RICOH electronics devices division – SC82 120mA LDO REGULATOR

R1140Q
TECHNICAL NOTES
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=3.8V
(2) Frequency band: 10Hz to 2MHz
(3) Temperature: 25°C
R1140Q281×
VIN=3.8V, CIN=Ceramic1.0µF
COUT=Ceramic2.2µH
100
R1140Q281×
VIN=3.8V, CIN=Ceramic2.2µF
COUT=Ceramic2.2µH
100
10
10
1
0.1
0.01
0
20 40 60 80 100 120
Load Current IOUT (mA)
1
0.1
0.01
0
20 40 60 80 100 120
Load Current IOUT (mA)
17