R1517 Datasheet, PDF (12/38 Pages) RICOH electronics devices division – Input Voltage Range (Maximum Rating) 3.5 V to 36.0 V (50.0V)

R1517x
NO. EA−304−170112
TECHNICAL NOTES
Phase Compensation
In LDO regulators, phase compensation is provided to secure stable operation even when the load current is
varied. For this purpose, use the capacitor C2 of 0.1 µF or more (R1517xxxxB/D/E/F) / 1.0 µF or more
(R1517x001C).
When using a tantalum type capacitor and the ESR (Equivalent Series Resistance) value is large, the output might
be unstable. Evaluate the circuit including consideration of frequency characteristics.
For the externally adjustable output voltage type (R1517x001C), use 10 kΩ or lower resistance R2.
PCB Layout
Ensure the VDD and GND lines are sufficiently robust. If their impedance is too high, noise pickup or unstable
operation may result. Connect 0.1 µF or more of the capacitor C1 between the VDD and GND, and as close as
possible to the pins.
In addition, connect the capacitor C2 between VOUT and GND, and as close as possible to the pins.
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