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Rev. 1.11

- 2 -

n

n

n

n BLOCK DIAGRAM

OSC

EXT

GND

Vref

CE

Chip Enable

Soft Start

Protection

PWM/VFM

CONTROL

n

n

n

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

- - - -

d

Code

Contents

a

Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V is possible.

b

Designation of Oscillator Frequency

2 : fixed

c

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

d

Designation of Taping Type;

Ex. :TR,TL(refer to Taping Specification)

”TR” is prescribed as a standard.