The XC9268 series has a maximum input voltage of 36V, making it suitable for use as a power supply for step-down from a 12V or 24V line. Its low minimum input voltage of 3.0V makes a maximum d uty of 100% possible, so it can also be applied as a component in an input OR circuit used with a backup line. The operation mode is PWM / PFM automatic switching control. 83% (V IN = 12V, V OUT = 5.0V, I OUT = 1mA) efficiency is realized in the standby load state such as microcontroller. In addition, even with heavy load in the active state, the DC-DC converters achieve 85% or more efficiency and high efficiency is realized in the entire load area. S witching frequency can be selected from either 1.2MHz or 2.2MHz and since it operates by PWM control. The soft-start time has been set internally to be 2.0ms (Typ.), but a time longer than the internal soft-start can be set optionally depending on the resistance and capacity connected to the EN/SS terminal.
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