XD9268 Series

The XC9268 series are 36V operation synchronous step-down DC/DC converter ICs with a built-in P-channel MOS driver transistor and N-channel MOS switching transistor. The XD9268 series has an operating voltage range of 3 V to 36 V, a switching frequency of 2.2 MHz, and the circuit scheme of synchronous rectification to be a highly efficient and stable power supply. An internal reference voltage source of 0.75 V is available, and the output voltage can be set to 1 V to 25 V by external resistors (RFB1, RFB2).

The soft-start time is internally set to 2.0ms (TYP.), but can be adjusted to set a longer time using an external resistor and capacitor. With the built-in UVLO function, the driver transistor is forced OFF when input voltage becomes 2.7V or lower.

The output state can be monitored using the power good function. Over-current protection and thermal shutdown are built in as protection function, and it can be used safely even in the case of short circuit. Internal protection circuits include over current protection and thermal shutdown circuits to enable safe use.

Typical Application Circuit


Input Voltage Range 3~36V(Absolute Max 40V)
Output Voltage Range 1.0~25V
FB Voltage 0.75V±1.5%
Oscillation Frequency 2.2MHz
Output Current 600mA
Quiescent Current 13.5μA
Control Methods PWM/PFM Auto
Efficiency 82%@12V→5V、1mA
Soft-start Time Adjustable by RC
Protection Functions Over Current Protection(Automatic Recovery)
Thermal Shutdown
Output Capacitor Ceramic Capacitor
Operating Ambient Temperature - 40℃ ~ + 105℃
Environmentally Friendly EU RoHS Compliant, Pb Free



Technical Document