R1160 Datasheet, PDF (28/31 Pages) RICOH electronics devices division – 3-MODE 200mA LDO REGULATOR

R1160x
TECHNICAL NOTES
R1160D (SON-6) is the discontinued product. As of March in 2015.
VDD
VOUT
R1160x
C1
Series
C2
CE
ECO GND
(External Components)
C1: Ceramic Capacitor 1μF
C2: Tantalum Capacitor 2.2μF
When using these ICs, consider the following points:
1. PCB Layout
Make VDD and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result.
Connect a capacitor C1 with a capacitance value as much as 1.0μF or more between VDD and GND pin, and as
close as possible to the pins.
Set external components, especially the output capacitor C2, as close as possible to the ICs, and make wiring
as short as possible.
2. Phase Compensation
In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For
this purpose, use a capacitor C2 with 2.2μF or more and good ESR (Equivalent Series Resistance).
(Note: If additional ceramic capacitors are connected with parallel to the output pin with an 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.)
If you use a tantalum type capacitor and ESR value of the capacitor is large, output might be unstable.
Evaluate your circuit with considering frequency characteristics.
If you use a ceramic type output capacitor, please connect about 1Ω resistor in series for the stability of output
voltage.
Depending on the capacitor size, manufacturer, and part number, the bias characteristics and temperature
characteristics are different. Evaluate the circuit with actual using capacitors.
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