■ GENERAL DESCRIPTION
The XC9248 series is 18V bootstrap synchronous step-down DC/DC converter with built-in Nch-Nch driver transistors.
With an input voltage range from 4.5V to 18V and a maximum output current of 2.2A, the series is suitable for digital home appliance power supplies and can be used with small ceramic capacitors.
The series has a 0.8V reference voltage, and using externally connected resistors, the output voltage can be set freely from 1.0V to 12V.
The control method is synchronous PWM (Source/ Sink). The soft start time is internally set to 2.8ms (TYP.), also can be adjusted using external capacitor.
With UVLO (Under Voltage Lock Out) function, the internal driver transistors are forced OFF when input voltage falls down below 3.8V (TYP.).
The series includes over current protection, VOUT short-circuit protection, Lx short-circuit protection, VOUT overvoltage protection and thermal shutdown.

■FEATURES
   Input Voltage ： 4.5V ～ 18V
   Output Voltage ： 1.0V～12V (VFB=0.8V±1.5%) (*1)
   Output Current ： 2.2A
   Efficiency ： 93.8% (*1) @VIN=12V,VOUT=5V, IOUT=700mA
   Oscillation Frequency ： 500kHz
   Maximum Duty Cycle ： 79%
   Soft-Start Time ： Fixed2.8ms, set by external capacitor
   Protection Circuit ：
      UVLO
      High side over current protection
      Low side over current protection
      VOUT Short-circuit Protection
      LX Short-circuit Protection
      VOUT Over voltage protection
      Thermal shutdown
   Package ： SOP-8FD
   Environmentally Friendly ： EU RoHS Compliant, Pb Free
   (*1) Performance depends on external components and wiring on the PCB.
  
■ APPLICATIONS
● Digital home appliance
● Office automation equipment
● Notebook computers
● Car accessories power supplies