XC9248

XC9248 Series ETR05022-008 18V Driver Transistor Built-In Synchronous Step-Down DC/DC Converter ■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. ■APPLICATIONS ●Digital home appliance ●Office automation equipment ●Note PCs / Tablet PCs ●Car accessories power supplies ■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 ： Fixed 2.8ms, set by external capacitor Protection Circuit ： UVLO High side over current protection Low ...