R1232D RICOH [RICOH electronics devices division], R1232D Datasheet - Page 9

• Manufacturer Part Number: R1232D
• Description: PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
• Manufacturer: RICOH [RICOH electronics devices division]

Pay attention in the selection of the peripheral circuits. In particular, design the peripheral circuits in a way that
the values such as voltage, current, and power of each component, PCB patterns and the IC do not exceed their
respected rated values.
When you use these ICs, consider the following issues;
The performance of power source circuits using these ICs extremely depends upon the peripheral circuits.
• Input the same voltage into power supply pins, V
• When you control the CE pin by another power supply, do not make its "H" level more than the voltage level
• Set external components such as an inductor, C
• At stand by mode, (CE="L"), the L
• In terms of the protection circuits, current limit for the peak current of each cycle of Lx, and the latch
• Reinforce the V
• Connect the TEST Pin to the "L" or GND level.
of V
minimize the wiring to V
L
protection circuit, which works if the over-limit current flows continuously for a certain time exist. To release
the protection, once make this IC into be standby mode with chip enable pin, or make the supply voltage be
down to UVLO threshold level or less.
impedance of V
switching current, and the operation might be unstable.
X
pin turn off.
IN
/ V
DD
pin.
IN
IN
, PGND, and V
and PGND lines is too large, the internal voltage level in this IC may shift caused by the
IN
pin and PGND pin.
OUT
X
output is Hi-Z, or both P-channel transistor and N-channel transistor of
lines sufficiently. Large switching current may flow in these lines. If the
IN
and V
IN
, C
OUT
DD
. Set the same level as AGND and PGND.
as close as possible to the IC, in particular,
R1232D
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