R1114x

21

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:

GND

VOUT

CE

VIN

VIN

IOUT

ESR

R1114xxx1B/D

S.A.

Ceramic

Cap.

Ceramic

Cap.

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 40

μV (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

R1114x161x

100

10

1

0.1

0.01

Load Current IOUT (mA)

060

30

150

120

90

CIN=Ceramic 1.0

μF,

COUT=Ceramic 1.0

μF

100

10

1

0.1

0.01

Load Current IOUT (mA)

060

30

150

120

90

CIN=Ceramic 0.47

μF,

COUT=Ceramic 0.68

μF