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RP100X Datasheet(PDF) 5 Page - RICOH electronics devices division

Part No. RP100X
Description  LOW NOISE 200mA LDO REGULATOR
Download  28 Pages
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Maker  RICOH [RICOH electronics devices division]
Homepage  http://www.ricoh.com
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RP100X Datasheet(HTML) 5 Page - RICOH electronics devices division

 
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RP100x
5
TYPICAL APPLICATION
C1
RP100x
Series
VDD
VOUT
CE
GND
C2
VOUT
(External Components)
C2
1.0
µF
MURATA: GRM155B31A105KE15
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, use a capacitor C2 with good frequency characteristics and ESR (Equivalent Series Resistance).
Ceramic capacitors have different temperature characteristics and bias characteristics depending on their
dimensions and manufacturers. If the setting voltage is 2.5V or more and the capacitor’s dimensions for V
OUT
equal to 1.0mm by 0.5mm or smaller than that, the capacitance value might be extremely low. As a result, the
capacitance might be much less than expected value. In such cases, the operation might be unstable at low
temperature. (-20
°C or less) In that case, use a larger capacity, or a large dimensions’ capacitor. (For
example 1.6mm by 0.8mm)
If a tantalum capacitor is selected as an output capacitor, large ESR may be a cause of unstable operation.
Evaluate the operation of PCB with considerable frequency characteristics.
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 1.0
µF 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.


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