R1223N Datasheet, PDF (2/19 Pages) RICOH electronics devices division – PWM/VFM Step-down DC/DC Converter

n BLOCK DIAGRAM
OSC
VIN
EXT
PWM/VFM
CONTROL
Vref
Protection
Soft Start
Chip Enable
VOUT
CE
GND
n SELECTION GUIDE
In the R1223N Series, the output voltage, the oscillator frequency, the optional function, and the taping type for
the ICs can be selected at the user’s request.
The selection can be made by designating the part number as shown below;
R1223NXXXX-XX
- -- -
Code
a
b
c
d
a bc d
Contents
Setting Output Voltage(VOUT):
Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V is possible.
Designation of Oscillator Frequency
2 : fixed
Designation of Optional Function
A : 300kHz, with a PWM/VFM alternative circuit, Latch-type protection
B : 500 kHz, with a PWM/VFM alternative circuit, Latch-type protection
C : 300kHz, without a PWM/VFM alternative circuit, Latch-type protection
D : 500kHz, without a PWM/VFM alternative circuit, Latch-type protection
E : 300kHz, with a PWM/VFM alternative circuit, Reset-type protection
F : 500 kHz, with a PWM/VFM alternative circuit, Reset-type protection
G : 300kHz, without a PWM/VFM alternative circuit, Reset-type protection
H : 500kHz, without a PWM/VFM alternative circuit, Reset-type protection
Designation of Taping Type; Ex. :TR,TL(refer to Taping Specification)
”TR” is prescribed as a standard.
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Rev. 1.11
-2-