R1114N151A Datasheet, PDF (21/31 Pages) RICOH electronics devices division – LOW NOISE 150mA LDO REGULATOR

R1114x
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, use a capacitor COUT with good frequency characteristics and ESR (Equivalent Series Resistance)
of which is in the range described as follows:
Ceramic
VIN
Cap.
CE
VOUT
R1114xxx1B/D
VIN
GND
Ceramic
Cap.
ESR
IOUT
S.A.
Spectrum
Analyzer
Measuring Circuit for white noise; R1114xxx1B/D
The relations between IOUT (Output Current) and ESR of an 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.
(Note: If 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.)
<Measurement conditions>
(1) VIN=VOUT+1V
(2) Frequency Band: 10Hz to 2MHz
(3) Temperature: −40°C to 25°C
R1114x151x
CIN=Ceramic 1.0µF,
COUT=Ceramic 1.0µF
100
R1114x161x
CIN=Ceramic 0.47µF,
COUT=Ceramic 0.68µF
100
10
10
1
1
0.1
0.1
0.01
0
30
60
90
120 150
Load Current IOUT (mA)
0.01
0
30
60
90
120 150
Load Current IOUT (mA)
21