R1140Q Datasheet, PDF (6/18 Pages) RICOH electronics devices division – SC82 120mA LDO REGULATOR

R1140Q
• ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE
Topt = 25°C
Output Voltage
VOUT (V)
Dropout Voltage
VDIF (V)
Condition
TYP.
MAX.
1.5 ≤ VOUT ≤ 1.6
0.36 0.70
1.7 ≤ VOUT ≤ 1.8
0.30 0.50
1.9 ≤ VOUT ≤ 2.0
IOUT = 120mA
0.28 0.45
2.1 ≤ VOUT ≤ 2.7
0.24 0.40
2.8 ≤ VOUT ≤ 4.0
0.18 0.30
TECHNICAL NOTES
When using these ICs, consider the following points:
Phase Compensation
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 capacitor COUT with good frequency characteristics and ESR (Equivalent Se-
ries Resistance).
(Note: When the additional ceramic capacitors are connected to the Output Pin with Output capacitor for phase com-
pensation, the operation might be unstable. Because of this, test these ICs with as same external components as ones
to be used on the PCB.)
PCB Layout
Make VDD and GND line sufficient. When the impedance of these is high, it would be a cause of picking up the noise
or unstable operation. Connect a capacitor with as much as 1.0µF capacitor between VDD and GND pin as close as pos-
sible.
Set external components, especially output capacitor as close as possible to the ICs and make wiring shortest.
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