R1513S Datasheet, PDF (7/23 Pages) RICOH electronics devices division – Input Voltage (Maximum Ratings) 3.5 V to 36 V (50 V)

TYPICAL APPLICATION
V_DD
V_OUT
R1513Sxx1B/D
C1
C2
CE _{GND VFB}
R1513S
NO.JA-321-160715
External Components List
Symbol
C1
C2
R1513S Typical Application
Description
1.0 µF, Ceramic Capacitor
4.7µF, Ceramic Capacitor
TECHNICAL NOTES
Phase Compensation
Phase compensation is provided to secure stable operation even when the load current is varied. For this purpose,
use a 4.7 µF or more output capacitor (C2) with good frequency characteristics and proper ESR (Equivalent Series
Resistance). Connect a 1.0 µF or more input capacitor (C1) between the VDD pin and the GND pin as close as
possible to the pins.
In case of using a tantalum type capacitor with a large ESR, the output might become unstable. Evaluate your
circuit including consideration of frequency characteristics.
Depending on the capacitor size, manufacturer, and part number, the bias characteristics and the temperature
characteristics vary.
PCB Layout
Ensure the VDD and GND lines are sufficiently robust. If their impedance is too high, noise pickup or unstable
operation may result. No. 2 pin and No.5 pin must be wired together when mounting on board. Connect a
capacitor with a suitable between the VDD and GND pins, and as close as possible to the pins. The load
regulation can be improved by short-circuiting VOUT and VFB close to the load device.
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