R5322N_07 datasheet(21/25 Pages) RICOH

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R5322N

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 2.2µF or more capacitance 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.

(Note: When a ceramic capacitor is connected to the Output Pin as Output capacitor for phase compensation,

the operation might be unstable unless as much as 1W resistor is connected between the capacitor and GND

instead of ESR. Test these ICs with as same external components as ones to be used on the PCB.)

(1) VIN

=3.8V

(2) Frequency band: 10Hz to 2MHz

(3) Temperature: 25°C

R5322N001x (VR1=2.8V)

Output Current IOUT1(mA)

040

0.01

0.1

100

CIN=Ceramic 1.0

µF

COUT=Ceramic 2.2

µF

120

100

Output Current IOUT1(mA)

040

0.01

0.1

100

CIN=Ceramic 2.2

µF

COUT=Ceramic 2.2

µF

120

100

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