18V Operation 3.0A Synchronous Step-Down DC/DC Converters
The XC9280 series is 18V bootstrap synchronous step-down DC/DC converter with built-in Nch-Nch driver transistors,
the operating voltage range is 4.5V~18.0V, designed to allow the use of ceramic capacitors.
0.75V reference voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.8V to 7.0V using
external resistors (RFB1, RFB2).
Switching frequency is 1.2MHz. In PWM/PFM automatic switchover control, IC can change the control method between PWM
and PFM based on the output current requirement and as a result IC can achieve high efficiency over the full load range.
XC9280 has a fixed internal soft start time which is 0.95ms (TYP.), additionally the time can be extended by using an external
resistor and capacitor.
With the built-in UVLO function, the driver transistor is forced OFF when input voltage goes down to 3.33V (TYP.) or lower.
Over current protection and thermal shutdown are embedded and they secure a safety operation.
● Digital TV
● Set Top Box
● Security camera
● Smart meter
● Security system
Input Voltage Range
Output Voltage Range
: 4.5V ~ 18V (Absolute Max 20V)
: 1.8V ~ 7.0V or VIN x 0.7
: 3A peak
2.0A DC (VIN=12V, VOUT=5V)
: PWM/PFM Automatic
Adjustable by RC
Over Current Protection
: Ceramic Capacitor
: EU RoHS Compliant, Pb Free
■TYPICAL APPLICATION CIRCUIT