R1500_17 Datasheet, PDF (6/27 Pages) RICOH electronics devices division – Input Voltage Range 4.0V to 24.0V

R1500x
NO.EA-151-160701
∗ R1500J (TO-252-5-P2) is the discontinued product as of July, 2016.
TYPICAL APPLICATION
VDD
VOUT
VOUT
C1
R1500x
Series
C2
CE GND
C1=Ceramic 0.47µF
C2=Ceramic 10µF
(External Components)
C2: Ceramic 10µF MURATA: GRM32DB31E106K (size: 3225)
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).
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.
Depending on the capacitor size, manufacturer, and part number, the bias characteristics and temperature
characteristics are different. Evaluate the circuit with actual using capacitors.
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 0.47µF 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.
No.2 pin and No.3 pin of SOT-89-5 and TO-252-5-P2 package must be wired to the GND plane when it is
mounted on board.
Thermal Shutdown
There is the built-in thermal-shutdown function in R1500x series. It discontinues operation of the IC when the
junction temperature becomes over 170°C (Typ.) and IC re-operates when the junction temperature under 145°C.
If the temperature increasing keeps the IC repeats ON and OFF operating. The output becomes the pulse
condition.
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