RAA23014X Datasheet, PDF (20/27 Pages) Renesas Technology Corp – 28.0V Input, Step-Down DC/DC Converter

RAA23014x RAA23015x
Output capacitor selection
RAA23014x and RAA23015x have a phase compensation circuit which is optimized to DC/DC operation. In
order to operate stably with the phase compensation, connect the output capacitor which is over 44 uF. Ceramic
capacitor can be used for output capacitor. It has low ESR, so VOUT ripple is decreased.
VOUT ripple (∆Vrpl) can be calculated by an equation below.
ESR : Equivalent Series Resistance
Input capacitor selection
Connect an input capacitor which is over 10 uF between each VIN pin and power ground. It should be placed
close to the device as possible.
VREG capacitor
Connect 1uF ceramic capacitor to VREG pin.
Bootstrap capacitor
Connect 0.1uF ceramic capacitor between LX pin and Boost pin.
R18DS0019EJ0100 REV.1.00
Sep.09.2015
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