The XC9704 Series from Torex Semiconductor are Synchronous Buck DC-DC Converter ICs that convert an input voltage of 3-36 V to an output voltage of 2.8-18 V. They have an efficiency of 90%. These converters include a built-in circuit configuration that achieves synchronous rectification and uses an external resistor to adjust the output voltage, which allows the utilization of multiple power lines for the same converter. They are controlled using the forced pulse width modulation (F-PWM) mechanism. 

These converters connect a resistor and capacitor to the EN/SS pin for externally adjusting the soft-start time to be longer than the internal soft-start time, enabling easy configuration of the power supply sequence. They also have a power good function that monitors the state of the output voltage, along with over-current protection and thermal shutdown circuitries to ensure high reliability. These RoHS-compliant ICs are available in surface-mount packages and are ideal for security systems, 4-20 mA current loops, high-voltage LDO replacement, home appliances, industrial sensors, and general-purpose power circuit applications.