r1115z RICOH Co.,Ltd., r1115z Datasheet - Page 21

• Manufacturer Part Number: r1115z
• Description: Low Noise 150ma Ldo Regulator
• Manufacturer: RICOH Co.,Ltd.

ESR vs. Output Current
this purpose, use a capacitor C
of which is in the range described as follows:
when the white noise level is under 40 µ V (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) V
(2) Frequency Band: 10Hz to 2MHz
(3) Temperature: − 40 ° C to 25 ° C
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
The relations between I
IN
= V
0.01
100
0.1
10
OUT
1
0
+ 1V
V
IN
30
Load Current I
R1115Z151x
Ceramic
Cap.
OUT
60
(Output Current) and ESR of an output capacitor are shown below. The conditions
Measuring Circuit for white noise; R1115Zxx1B/D
OUT
C
OUT
C
OUT
90
with good frequency characteristics and ESR (Equivalent Series Resistance)
IN
=Ceramic 1.0 F,
=Ceramic 1.0 F
(mA)
CE
V
IN
120
R1115Zxx1B/D
GND
150
V
OUT
0.01
100
Ceramic
Cap.
0.1
10
1
0
ESR
30
I
OUT
Load Current I
R1115Z161x
60
S.A.
C
C
OUT
OUT
IN
90
Spectrum
Analyzer
=Ceramic 0.47 F,
=Ceramic 0.68 F
(mA)
120
R1115Z
150
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