XC9280 Series

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.

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May 18, 2018
Product News
Step-Down Synchronous DC/DC Converters Compatible with 18V Input and 3A Peak Output XC9280 Series

Typical Application Circuit


Input Voltage 4.5V~18V(Absolute Max 20V)
Output Voltage 1.8V~7V or VIN x 0.7
FB Voltage 0.75V±1.5%
Oscillation Frequency 1.2MHz
Output Current 3.0A peak
2.0A DC (VIN=12V, VOUT=5V)
Control Method PWM/PFM Automatic
Soft-start Time 0.95ms
(Adjustable by RC)
Protection Circuits UVLO
Over Current Protection(Automatic Recovery)
Thermal Shutdown


Package TSOT-26 Number of Pins 6
Pcs/Reel 3,000 Package Size(mm) 2.9 x 2.8 x 1.1