The XC6383 series is a group of PFM controlled step-up DC/DC converters. Unlike conventional PFMs, the XC6383 automatically switches duty ratio (55% / 75%) when it senses changes in load and can support both large and small currents. The XC6383 series employs CMOS process and laser trimming technologies so as to attain low power and high accuracy. Maximum oscillator frequency is trimmed to 100kHz (accuracy: 15%). Every built-in switching transistor type enables a step-up circuit to be configured using only three external components ; a coil, a diode, and a capacitor.